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Geology of the Australian Capital Territory

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1120:. It is generally leached, and frequently silicified. The colour of the beds alternates between grey and black, but where weathered, it changes to whitish grey. The graptolites appear on the bedding planes as black films. In Canberra, the Acton Shale appears in several outcrops in Acton, in two bands through Aranda, through Bruce near the Calvary Hospital, on the Bruce Ridge behind Lyneham. Also another band starts under the University of Canberra in Belconnen, and heads north east through Lawson and Giralang and folded and faulted into several bands in Crace on Gungahlin Hill. Another band is found on the west side of Queanbeyan, extending north to Dundee, and south around the east side of Jerrabomberra Hill. Acton shale is only preserved in the cores of synclines, being eroded from uplifted parts. 3851: 774:. The host rock is a skarn where Shannons Flat Adamellite baked limestone from the Paddy's River Volcanics. The bulk of the mineral here is magnetite, but other sulfide and minerals of copper, lead zinc and silver attracted miners. Thomas Coyle operated the mine in 1895, producing 2.6 tons of copper and 26.1 kg of silver. In 1907 the Cowley Copper Syndicate Ltd started more work cutting two more adits and winzes. It was abandoned by 1909 as the ore was too low grade. More than a million tons of magnetite remain. Many minerals such as 1993: 2001: 99: 19: 2554: 3720: 3708: 2149: 146:... Came on to one of the plains we saw at 11 o’clock. At half past 1, came to a very extensive plain, fine Rich Soil and plenty of grass. Came to a Beautiful River plains that was running thro’ the plains in a S.W. direction, by the side of which we slept that night. When we made the Hut this evening, we saw several pieces of stone that had been burnt by all appearances. I then examined some of it, which proved to be limestone. ... 580: 2362: 1985: 2737: 2538:. The inclusions are metamorphosed sediments and are common in biotite. It contains quartz and microcline feldspar and brown biotite and also muscovite. It has more biotite and plagioclase than Shannons Flat Granodiorite. The muscovite is distinctly foliated and there is also blue quartz. Texture is fine to medium grained. Close to the Murrumbidgee Fault the texture is 1100:, so the source of the sediments is from another continent. The other evidence from the Ordovician sediments are chemical composition indicates granitic source, with the absence of feldspar. Secondly the fine grained nature shows the sediments have been transported a long way from their ultimate, source, and could have been second cycle, derived from sedimentary rocks. 2054:-units show reddish brown alteration. The unit is of Early Ludlovian age. The rock on Mount Rob Roy and Pemberton Hill used to be known as Tuggeranong Granite, but is actually ignimbrite. The ignimbrite forms escarpments, with the lower-lying land being underlain by tuff. The Deakin Volcanics can be found south of the Deakin Fault between Belconnen and 2820:
of 6.7 to 7.0 km/s between 22 and 47 km. Above this layer is rock with speeds of 6.4 to 6.6 km/s from 22 to 15 km deep probably made from basic igneous rocks that were once oceanic crust. Above 15 km depth the P-wave speed is from 6 to 6.2 km/s and likely to be Ordovician turbidites as seen at the surface.
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buff-coloured laminated siltstone and shale with fine sandstone beds contorted by slumping. Its top is an unconformity, with Camp Hill Sandstone lying on top. There is probably up to 200 metres thickness of this shale. The shale was deposited in the deep sea as turbidites. It can be found in Yarralumla,
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depth is about 46–47 km below sea level. South south east of Canberra to the Tasman Sea is a region of lower Moho depth than the surrounding south-east Australia. Seismic P-waves travel at 8.1 km/s in the mantle below this boundary. Above the Moho is an underplated layer with P-wave speeds
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there is migmatite where the sediments have been partially melted in order to produce the plutonic rocks in the batholith. Variations in their composition are explained by partial mixing with melted oceanic crust. The batholith was largely crystallised before emplacement, and made space for intrusion
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The subducting Pacific plate was old, cold and dense, easily sinking into the mantle at a steep angle. The hinge zone of the plate also migrated oceanwards over time. So the trench retreated oceanwards, and the old trench and ocean floor become part of the continental plate. Volcanoes formed inwards
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capped with black shale. It consists mainly of fine to medium grained quartz rich sandstone and some mostly thin beds of siltstone, shale and slate. The sediments occur in a band on the west side of the ACT on Bulls Head, Mount Franklin, Mount Ginini and along the upper parts of the Cotter River. A
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A coarse green grey rhyodacitic intrusive with white prominent feldspar crystals appears between the arms of Lake Ginninderra, McKellar, Evatt, Nine Elms, east Spence, and Nichols. This covers a few square kilometres. A small outcrop of the same material occurs in Cook and Jamison Center. This rock
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sediment. The eruption came from a volcano into shallow sea water. The deposits built above sea level as they progressed. The underlying sediments now make up the Canberra Formation. Between Hall and Nanima Hill on Spring Range, the Mount Painter Volcanics lie unconformably on top. These rocks date
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Several stages of volcanic activity followed. The first stage with Paddys River Volcanics, Walker Volcanics in west Canberra, Hawkins Volcanics in the north and Ainslie Volcanics in the north east had acidic lava volcanoes erupting. The next stage was Mount Painter Volcanics in middle Canberra, and
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Tidbinbilla Quartzite has been modified by granite intrusions close by. It consists of medium grained sandstone, partly silicified and changed to quartzite. Belts of silstone and sandstone are included becoming more frequent at the top. The exposure is 300 metres thick. Low down there is a 2-metre
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by Öpik in 1958. It consists mainly of mudstone which may be cemented by lime, or originally derived from tuff. There are some beds inserted of quartz sandstone or limestone. The bottom of the formation is on top of the Mount Painter Volcanics. The top of the formation grades up into pyroclastics
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north to the east of Woolshed Creek, through Majura and at least to Gooroo Hill and Old Joe on the NSW border. On Mount Ainslie the sequence starts with dacitic tuff, banded dacitic tuff, massive dacitic tuff, fifty metres of agglomeratic tuff, massive dacitic tuff, fifty metres of ashstone and
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lens north of Uriarra Crossing. The outcrop goes from Mountain Creek Road in the west to the Murrumbidgee river in the east. It extends a few kilometres to the north of the ACT border and south to the Winslade Fault near the Cotter River. A wedge extends to the south south west, which includes
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Deposition occurred in a shallow marine environment with a delta. The sea level was relative higher during this depositional phase compared with the earlier and later subaerial volcanic deposit periods. Its age is early Ludlow. This has been determined by shelly marine fossils, and a tonalite
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are found. The geological formation east of Queanbeyan used to be known as the Muriarra Formation. This alternates between sandstone with a high quartz content and mica, and phyllite. Radiolarian chert is found in the central section. The railway forms the border between Queanbeyan in NSW and
417:. The flow was in the northerly direction, indicating that the continental slope was to the south. These deposits occurred during the Ordovician period. The ocean floor was distant from the continental source of the sediment. Towards the end of this period there were isolated parts where no 1164:
is shale, mudstone, siltstone and minor sandstone. In the type location there is about 60 metres of non-calcareous sandy shale and dark grey shale with beds of fine-grained sandstone. Between Kings Avenue and Commonwealth Avenue, there is a good outcrop on State Circle, consisting of
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in the ACT. West of the Queanbeyan railway station is a cutting where folding has overturned the beds, with axes dipping to the east at 50 degrees. 300 metres of thickness is exposed in this cutting. Llanvirnian age (Pygodus serrus conodont zone). Fossils found include Phyllograptus anna,
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Horst. This was probably in a different position relative to Canberra, compared to the present. From here, ocean floor turbidite deposits occurred in the Ordovician period. The sediments were deeply buried by being compressed and faulted down. Melting occurred in deep sediments and in the
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Magnetic deviation through the centre of Canberra was measured at 12.00 degrees east in 1985. The contours run North east. Each year it shifts 2.2 minutes to the east. Magnetic field in all three components is measured continuously at a station in Canberra and made available online.
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is a fine grained tuff. In addition to the ashstone the Canberra Formation has layers of green-grey to reddish dacite, also tuff, quartz andesite, but mostly it is calcareous shale, limestone or sandstone. Much is deeply weathered, which has posed difficulties for building foundations.
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The Paddys River Volcanics consist of dacite and tuff with some shale phyllite and limestone. They occur to the west of the Bullen range, along the lower parts of the Paddys River. They were deposited on top of the Ordovician Adaminaby Beds, and intruded by Shannons Flat Adamellite.
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Walker Volcanics appear as purple or greenish-grey dacitic ignimbrite. These volcanics contain chloritised cordierite and some have garnet. They are Wenlock age. They occur in southern Belconnen including Macquarie, Weetangera, Hawker, Page, Scullin, Higgins, Holt and the Pinnacle.
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In the east side of the Cullarin Block, in the east-pointing finger of the ACT, the Tabberabberan Orogeny also reached the upper greenschist facies again. East–west pressure caused ruptures forming the Winslade and Deakin Faults and other northwest- or northeast-trending faults.
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core of the continent. The Tasmanides are the result of compression, horizontal shortening, and vertical thickening of various "terranes" such as small continental fragments and volcanic island arcs that were plastered against the original continental margin as a result of
1228:. The deposition was in a marine proximal turbidite fan, with the turbidity current flowing to the east. There are no fossils, but there is some sedimentary structure including plane, cross or convolute laminations, load casts, slump units and flute moulds. 3468: 437:
from the trench. The part of the oceanic plate attached to the continent was compressed, the suboceanic crust was severely shortened and thickened as well, giving rise to a duplex structure. This happened at the end of the Ordovician period and in the
1599:, who called it a porphyry. The description is a massive dark bluish-grey dacitic crystal tuff containing garnet and chloritised cordierite. There is a local appearance of agglomerate and pumice. There are prominent quartz and feldspar phenocrysts. 766:
was tunneled in the Balconnel Gold Mine around 1894. No significant gold was ever found there. The mine was 200 m downstream from the Molonglo River on the Murrumbidgee River with coordinates 35°S deg 14' 38.3", 148°E deg 58' 13.6".
2038:. Southwards the section passes up into a massive and partly banded rhyodacitic ignimbrite. The bottom of the Deakin Volcanics is exposed on nearby Heysen Street. At least 400m thickness of beds are exposed in the Parkway cutting. The 2756:
Pool Area. A similar dyke also outcrops on the west side of the Murrumbidgee River near Pine Island. The dyke is less than 0.5 metres thick. The rock is black, showing up well against the reds and browns of the Laidlaw Volcanics.
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At the time these sediments were deposited the location was at least 3,000 km from the Australian continent. Underneath there is no Proterozoic continental basement, instead these sediments are lying on top of oceanic crust.
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is −400, the highest levels in the metropolitan area are at Watson and Mitchell at −350, and at Mulligans Flat at −345. This means that a 50 kg person, if measured on a force scale rather than on a balance, would apparently
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Trigonograptus ensiformus, Pterograptus, Didymograptus, Isograptus, Hallograptus from the Darriwillian age. Near the top of the formation are fossils Dicellograptus sextans, D divaricatus, D salopiensis, which are Gisbornian.
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A second unconformity occurred after the Black Mountain Sandstone was uplifted and eroded at the end of the early Silurian. This was called the Quidongan Deformation. The Canberra formation was deposited in shallow water with
95:. At the time these were the oldest fossils discovered in Australia, though this record has since been far surpassed. Other specific geological places of interest include the State Circle cutting and the Deakin anticline. 1139:
period. Lower beds contains fossils like Dicranograptus nicholsoni. Upper beds contain Climacograptus bicornbis, Chastatus, C tubuliferis, Dicellograptus elegans, and Dicranograptus hians which are late Eastonian in age.
2870:, so this level is –32 milligals. Another high of –330 μm·s is just north of the northernmost point of the ACT. The contours in the ACT run NW–SE. At the Canberra GPO is about −440, at Scriviner Dam −510, at 3667: 1292:. It is also found through North Canberra, excluding Campbell and Russell. It occurs through most of Gungahlin apart from Crace and Nicholls. The beds extend north in a wide band to 35 deg 03S near Bald Hill. 676:
schist occur there. Within this region, there are two parallel belts of knotted schist even more strongly heated to over 525 °C. The temperature gradient in the area was high at 70 °C per kilometre.
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bed called the Tarpaulin Creek Ashstone Member outcrops in an approximate north–south line and acts as a marker within the volcanics. Tuff and flows above and below the ashstone member contain obvious pink
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Hawkins Volcanics is a green-grey dacite or dacitic tuff. These volcanics contain chloritised cordierite, and some have garnet. Their age is Ludlow to Wenlock. The volcanics occur in northern Belconnen, in
3662: 2527: 441:. The sediments were heavily folded and overthrusted resulting in severe crustal shortening. In the Canberra area the sediments were raised above sea level and eroded. The land to the west (around 429:
debris were deposited into oxygen-depleted deep water. This ocean basin has been called the Monaro Basin. To the north west was a volcanic chain of islands, the Macquarie arc, with an associated
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Plate tectonic processes in the southwest Pacific: a spatial and temporal context Barry Drummond, B. L. N. Kennett, R. J. Korsch, B. R. Goleby & P. A. Symonds Penrose Conference March 1999
138:. Detailed instructions had been given to the explorers by Charles Throsby, who had accompanied the Lake George exploration party earlier in the year. They were provided with acid to test for 1609:
Mount Painter Volcanics overlie the Walker Volcanics unconformably. The top is also an unconformity with Yarralumla Formation and Deakin Volcanics and Yass Formation. The age is of Late
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These fossils were from the Canberra Formation. In the past these rocks were known as the Canberra Group with components of Turner Shale, Riverside Formation, and City Hill Shale.
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The Tharwa Adamellite resembles Shannons Flat Adamellite, but with more strongly zoned plagioclase (An50-20) contains microcline, it is poor in xenoliths and is coarse grained.
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A line of outcrops of coarse pink-brown rhyodacitic porphyry outcrops on the north side of Canberra on Forster Hill, MCquoids Hill and Neighbour Hill, and on East side of
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The Murrumbidgee Batholith formed by melting different sediments to the Ordovician Pittman Formations, as the granites contain more feldspar elements Ca, Na and K. At
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intrusions could also be volcanic necks. If so they have been responsible for the Laidlaw Volcanics. They are all unnamed. The first three intrude Laidlaw Volcanics.
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The Bowning Deformation caused the north–south faulting and long folding in the area surrounding the ACT. This deformation was connected with the attachment of the
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with age ranges of 0.46 and 0.60 Gya, 1.0 and 1.2 Gya, and at ~1.8 Gya, ~2.2 Gya and ~2.7 Gya. These do not match the age of zircons from the interior of the
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and water deposited tuff occur to the west of Pine Island and Point Hut Crossing. North west of Mount Stromlo, on Uriarra Road, there is an occurrence of
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Henderson, G. A. M. and Matveev, G., Geology of Canberra, Queanbeyan and Environs 1:50000 1980. This was used to determine the rock types in each suburb.
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McQueen, Ken G.; J. R. Caldwell; P. W. Millsteed (July 1988). "Primary and Secondary Minerals at the Paddy's River Mine, Australian Capital Territory".
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A coarse rhyodacitic intrusive outcrops to the north west of Charnwood intrudes Laidlaw Volcanics, with about half a square kilometre of surface area.
1685:. Exposures can be seen at the Deakin Anticline—with pale brown siltstone; and also at the Yarralumla brickworks with olive-green calcareous mudstone. 1658:
in the north. The formation is evidence of the last major period when eastern Australia was still covered by shallow seas. It shows fossil evidence of
1539:. The lithology is bluish grey dacitic tuff, which can be massive or foliated, also dacitic agglomerate and shale. These volcanics contain chloritised 3815: 2285:
A coarse porphyritic micro-adamellite was intruded sometime from late Silurian to early Devonian. It intrudes the Hawkins Volcanics in Belconnen in
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are rarely found. The beds are up to 60 metres thick and appear high in the Pittman Formation. The age range is Gisbornian to Bolindian of the
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The sediments making the Acton Shale were deposited in the ocean in a reducing environment starved of oxygen, and lacking fresh sediment.
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East and north east of Watson is an intrusion of grey and cream dacite. This may correspond to the lower layer of the Ainslie Volcanics.
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The Laidlaw Volcanics: a Late Silurian point on the geological time scale by D. Wyborn and M. Owen, W. Compston and I. McDougall in
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which excavates Camp Hill Sandstone, and a large quarry on Mount Mugga Mugga which excavates Mugga Mugga Porphyry for construction
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In an intervening phase in volcanism predominantly sediments were deposited. Yarralumla Formation was named after the suburb of
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mingled and intruded upwards. The Murrumbidgee Batholith was formed, with several intrusions. The faults were reversed and the
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and north are very thick and heavily overturned and thrusted. At Etheridge Creek, the type locality is a repeating pattern of
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sediments and there are some beds of tuffaceous siltstone and sandstone. It was mostly deposited from the air without water.
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Shannons Flat Granodiorite is poor in xenoliths and is coarse grained. It was intruded after the clear Range Granodiorite.
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intrusion southwest of Red Hill with age determined as 417±8 Mya. Outcrops occur on Red Hill (the hill) and throughout
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Dated early Ludlow to Wenlock. This may outcrop in Belconnen and Florey. The composition is calcareous and tuffaceous
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Black Mountain Sandstone is deposited on top of State Circle Shale conformably. It is made up from thick beds of grey
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Henderson, G. A. M., Geology of Canberra, Queanbeyan and Environs Notes to Accompany the 1980 1:50000 Geological map.
3452: 3383: 1270:. At the time these were the oldest fossils discovered in Australia, though this record has now been far surpassed. 984:
The Pittman Formation was described originally by Öpik in 1958 who named it after the Pittman Valley, southeast of
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The State Circle Shale was named by Öpik in 1958. It is named after the street where it was described. Its age is
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explains the large-scale structure of the Earth's crust and its constituent rocks in terms of blocks moving along
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over the ACT has been measured and published on the 1:100000 Canberra Geological Map. High level points in the
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stage, with shallow burial and temperature below 350 °C. This changed the volcanics and sediments with
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A plate with a continent fragment on board bumped into the east coast of what is now Australia, forming the
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Another pink and green rhyolite porphyry occurs in Holder, Weston and Lyons. It intrudes Deakin Volcanics.
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consisting largely of quartz-rich sandstone, siltstone and shale; the Adaminaby Beds and the Acton Shale.
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The ACT is moving 24 degrees east of north with a velocity of 54.5 mm/yr along with the rest of the
997: 540:. At least four large eruptions made up this volcanic deposit. Over the top of this in the west near the 528:
deposits. Volcanic activity resumed with Deakin Volcanics in the north west and south of Canberra. First
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occurs in the Red Rocks Gorge near Allens Creek. It is oriented northwest–southeast and heads towards
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The Mugga Mugga Porphyry is a lava flow. It is blue or mauve grey in a mass. The rock is veined with
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Small granite intrusions injected the rocks in the Canberra Graben around 408 million years ago. The
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The early European name for the district was "Limestone Plains". In 1820, following the discovery of
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that make up the core of the old mountain range that makes up the Australian continent east of the
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between Hindmarsh Drive and Cotter Road. The visible base shows a weathered repeating sequence of
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Richardson, S. J. and Barron L., 1977 Michelago 1:100000 Geological, Sheet 8726, Geol Surv Sydney
2933:. They have a duplex structure with red or brown clayey layer. Typical thicknesses are 2 metres. 1575:
period. They were formed about the same time as the Walker Volcanics and Paddys River Volcanics.
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area. The Canberra area was on the proto-Canberra-Yass Shelf. East of Canberra deep water of the
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operations have occurred historically throughout the region, both for precious metals including
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area has the thickest deposits. Rock types in the Deakin Volcanics are rhyodacitic ignimbrite,
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Basement of the Lachlan Fold Belt: the Evidence From S-Type Granites B. W. Chappell, GEMOC ANU
3592: 3201: 3088: 3053: 3023: 2964: 2906: 1617:. These rocks form a belt from Coppins Crossing towards Narrabundah and Jerrabomberra Creek. 1013: 521: 201: 739:, and for construction materials. The only commercial operations now here are the Stockmans 3571: 2839: 2835: 2337:. Minor minerals are apatite and zircon. The surrounding Pittman formation rocks have been 602:
occurred. In the Canberra Graben and Cullarin Block, metamorphism mostly reached the upper
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The gravity lows are due to the Murrumbidgee Batholith which is compose of lighter rocks.
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where it is found. Originally it was believed to be Ordovician, but is actually from the
155: 3921: 2424: 2271: 2214: 2172: 1568: 1212:. The grain size is fine to medium. It was originally named by Öpik after the mountain— 696: 541: 367: 119: 3498: 3946: 3448: 2313:. The outcrop covers 4 square kilometres in the ACT. It was intruded during the late 2086:. The different colours found in the rocks are due to weathering, the red being from 1647: 1097: 418: 414: 410: 248: 115: 22:
Australia grew around three fused pieces of very ancient continental crust (cratons).
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topped with massive dacitic tuff. The rocks on top of the eastern ridge is altered.
1084:, are very similar in all parts of the Tasman Orogen, including New Zealand and the 988:. It is entirely of Ordovician age and about 800 metres thick near Canberra, but at 707:
areas. This uplift reactivated the Murrumbidgee Fault, the Queanbeyan Fault and the
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in the north, as these continental units were attached to Australia at the time, in
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There is little limestone evident at the surface in the district, but an outcrop at
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Narrabundah Ashstone is a member of the Canberra formation and is found is eastern
438: 430: 3074:"1301.0 - Year Book Australia, 1931 — Special Article - Canberra Past and Present" 496:, and shale forming. There were some small volcanic activities at this stage with 3363: 2999: 2851: 2687: 2342: 700: 692: 375: 260: 226: 193: 189: 135: 3916: 3911: 3735: 3724: 2745: 2375: 1678: 1555: 685: 658:
facies was achieved. This was not sufficient to convert plagioclase to albite.
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Temperature gradients in the Canberra area vary from 20 to 30 °C/km. At
3970: 3931: 2891: 2353:. A magnetic high matches the location indicating the presence of magnetite. 2338: 2240: 2228: 1610: 989: 803: 560: 516:. Then came a pause in volcanism at the start of the Upper Silurian with the 485: 158:. These formations became exposed when the ocean floor was raised by a major 2000: 1596: 1237:
thick bed of ashstone across a broad area that can be used as a marker bed.
665:, east of the ACT on the Molonglo Range and Yarrow Peak and Taliesin Hills. 476:. The source of the Black Mountain sand was near by from the west, from the 3906: 3825: 2884: 2706: 2683: 2192: 1579: 1558:. The thickness is at least 700 metres. The magma was formed by melting an 1225: 1221: 1157: 795: 791: 775: 599: 552: 536:, more rhyodacite, tuff with some underwater sediments, and finishing with 446: 98: 18: 3044:"Deakin Anticlines, Macgregor St, Deakin, ACT, Australia (Place ID 13312)" 3014:"State Circle Cutting, State Ccl, Parkes, ACT, Australia (Place ID 13321)" 1080:, feldspathic sandstone, micaceous siltstone, micaceous shale, chert, and 770:
Paddys River Mine or Cowley copper mine is located 700 m upstream on
2879: 2691: 2553: 2530:. Clear Range ridge forms the ACT border in the south east. Described as 2118: 2083: 2017: 1029: 662: 655: 615: 603: 544:
there was a further massive volcanic eruption, called Laidlaw Volcanics.
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separate outcrop extends into the ACT from the south in the area of the
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where their type location occurs, the Ainslie Volcanics are composed of
173:(ACT) are made from granite-like rocks. These are from the Murrumbidgee 118:
decided to send a party, with provisions for one month, to discover the
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Richardson, S. J., 1976, Geology of the Michelago 1:100000, Sheet 8726
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http://www.tams.act.gov.au/__data/assets/pdf_file/0016/13363/78.pdfACT
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A distorted band of coarse grey rhyodacitic porphyry occurs along the
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age 420.7±2.2 m.y. and have been used to set an absolute date for the
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Canberra Formation can be found in the east part of South Canberra in
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West of the Murrumbidgee is another different geological setting. The
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resulted between the Pittman Formation and the State Circle Shale and
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to the north of the Cotter Dam is actually a dacite flow. There is a
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and is dated at 410+4Mya. The colour is pale grey with mineral white
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Strusz, D. L., 1:250000 Geological Series-Explanatory Notes Canberra
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A. A. Öpik, "The Geology of the Canberra City District", chapter in
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A Geological Guide to the Canberra Region and Namadgi National Park
2867: 2788: 2784: 2695: 2416: 2411: 2346: 2334: 2318: 2314: 2254: 2224: 2168: 2130: 2122: 2106: 2087: 1702: 1614: 1572: 1536: 1300: 1263: 1217: 1125: 1081: 1066: 1033: 1009: 807: 799: 752: 666: 651: 631: 607: 548: 537: 501: 406: 387: 383: 241: 205: 163: 61: 35: 3447:. Geological Society of Australia (ACT Division). pp. 91–92. 2887:
1.3 grams more in Watson, than they would in western Kambah.
2842:
I = -65.856° dD = -0.008 deg/yr dF = -28 nT/yr dI = 0.014 deg/yr
2309:
intruding the Pittman formation in the hills to the north east of
650:
in the Laidlaw and Walker Volcanics the temperature was lower and
579: 49:
Most of the younger rocks are pyroclastic deposits from explosive
2855: 2761: 2721: 2420: 2361: 2326: 2306: 2126: 2102: 2098: 2051: 1667: 1563: 1058: 1021: 689: 635: 623: 595: 568: 370:. The remains of the mountains of this orogeny can be found near 252: 159: 50: 2163:
in the form of pale to dark grey rhyodacitic to dacitic crystal
409:
were deposited in the ocean floor in the form of fans formed by
386:. This happened between 520 and 480 million years ago up to the 87:
from the Silurian period were discovered at Woolshed Creek near
3501:
Is the Australian Plate deforming? A space geodetic perspective
3406:"Australian Stratigraphic Units Database, Geoscience Australia" 3170:
Crustal Evolution in Southeastern Australia: A Zircon Viewpoint
2930: 2875: 2753: 2396: 2350: 2322: 2184: 2137: 2114: 1984: 1714: 1603: 1551: 1547: 1529: 1251: 1198: 1132: 1089: 1054: 1041: 759: 748: 740: 736: 728: 720: 673: 669: 647: 619: 557: 497: 426: 401:
era at least a few thousand kilometres of the ocean floor were
213: 197: 76: 2736: 2446: 2199: 2035: 1694: 1663: 1209: 1113: 1017: 1005: 564: 462: 349: 297: 237: 34:
around 480 million years ago, whilst most rocks are from the
2690:. The total outcrop is 52 square kilometres. It is coarsely 2171:
in the ACT. The Laidlaw Volcanics occur in a band along the
2050:, tuffaceous shale and minor quartz sandstones and volcanic 251:, which is located on a terrane that is called the Benambra 177:
intruding during the late Silurian or early Devonian times.
2894:. This can measure changes in the gravity field over time. 2717: 2518:
Clear Range Granodiorite covers 475 square kilometres from
2407: 2399: 2164: 2152:
Ignimbrite from the Red Rocks Gorge has a strong red colour
2047: 2043: 1224:
epoch. Some of the slopes of Black mountain are covered in
732: 724: 533: 422: 1112:
Acton Shale is a grey to black thinly laminated siliceous
591:
was carried into position on the east coast of Australia.
2239:
in the Walker Volcanic sediments. It is likely to be the
1020:. In the sandstone beds there are occurrences of graded 638:
and opaque minerals. On the western margin in southwest
390:
period. No associated ocean floor has been preserved by
308:
Canberra Graben (north east ACT including Canberra, and
2949: 2890:
A sensitive gravity measuring station is positioned on
2832:
Magnetic Field Components at Civic at the end of 2013:
2702:
occurs in unweathered rock. This leucogranite intrudes
2423:, and the flows have banded flow structure. The Cotter 2909:
heat flow is 73 mWm with a gradient of 27 °C/km.
2862:
just north of the east finger of the ACT of –320 
2175:
to the south west of Canberra, and also north west of
661:
More intense metamorphism occurred to the east of the
2235:
intrusive outcrops over one square kilometre west of
1299:
and in a geological monument along Fairbairn avenue.
142:. On 7 December 1820, Smith recorded in his journal: 3531:
Packham, G. H., 1969, The Geology of New South Wales
3469:"Australian Geomagnetic Reference Field Computation" 2274:
from 1 to 4 kilometres south of Point Hut Crossing.
2129:. It is dated at 414±9 Mya. The Federal Golf Course 2012:
Volcanics can be seen in the road cutting along the
1996:
Deakin Volcanics rhyodacite modified to green colour
992:
it is over 1,200 metres thick. The lower levels are
280:
Captains Flat Graben (easternmost 3 km of ACT)
42:—was part of the ocean floor. The area contains the 2921:. It is sinking at a rate of 3.5 mm per year. 2435: 338:also known as Canberra-Yass Synclinorial Zone west 315:also known as Canberra-Yass Synclinorial Zone East 3525:Canberra 1:250000 Geological Sheet, SI 55–16, 1964 3241:"Definition card for: Narrabundah Ashstone Member" 2526:on the west side of the Murrumbidgee batholith on 2247:matches the upper layer of the Hawkins Volcanics. 1595:This was named after Mount Painter in Canberra by 405:, taking of the order of a hundred million years. 154:, near the Museum of Australia, by the shores of 3968: 3765: 3505:Geological Society of Australia Special Bulletin 2243:for the uppermost eruption of Walker Volcanics. 1361:Ainslie Volcanics oxide & element chemistry 1053:Chemical analysis reveals low concentrations of 1024:, clay pellets, and current bedding. Fossils of 3376:"Yarralumla Brickpits, Yarralumla, ACT Profile" 3076:. Australian Bureau of Statistics. January 1931 1554:is found on low hills on the north side of the 699:. The Kosiusko uplift elevated the land in the 3324:"Definition card for: Mount Painter Volcanics" 2728:than other Murrumbidgee Batholith intrusions. 2378:. Yet another outcrop is on the Bullen Range. 1578:The Ainslie Volcanics occur on Mount Ainslie, 1266:period were discovered at Woolshed Creek near 695:intruded into the Red Rocks Gorge area of the 204:, which was once a part of the supercontinent 169:Much of the western and southern parts of the 3751: 3556: 2874:Dam −600, and Banks −590. The western end of 166:forming much of the east coast of Australia. 2802:The dyke is believed to be Tertiary in age. 266: 3977:Geology of the Australian Capital Territory 2369:The Adaminaby Beds were formed from quartz 2090:, and the green from clay minerals such as 1582:, and in a band extending from Bonshaw and 1526:Mount Ainslie, Australian Capital Territory 28:geology of the Australian Capital Territory 3758: 3744: 3563: 3549: 2878:has the lowest level in Canberra at −610. 1535:and minor volcaniclastic and argillaceous 3442: 3426:Volume 59, Issue 1, June 1982, pp. 90–100 3219:"Definition card for: Canberra Formation" 2838:D = 12.273° field strength F = 58096 nT 2760:The rock consists of microphenocrysts of 2740:Black teschenite from the Red Rocks Gorge 2450:by displacement rather than dissolution. 2305:, the Sutton Granite is a medium grained 2094:. The pink crystals are potash feldspar. 303:Collingwood, Queanbeyan, Sullivans Faults 272:Rocky Pic Horst outside the east of ACT. 3570: 3285:"Stratigraphic Search Hawkins Volcanics" 2735: 2552: 2360: 2147: 1999: 1991: 1983: 578: 97: 17: 3263:"Stratigraphic Search Walker Volcanics" 3255: 3213: 3211: 2732:Olivine Teschenite from Red Rocks Gorge 2365:Adaminaby Beds outcrop south of the ACT 1683:Symonston, Australian Capital Territory 1240: 3969: 3438: 3436: 3434: 3432: 3144: 1204:mostly, but has some beds included of 1146: 456: 321:Murrumbidgee, Winslade, Pig Hill Fault 3739: 3544: 3233: 3190: 3172:Ian S. Williams and Bruce W. Chappell 2187:, and Greenway. The volcanics are of 1988:Banded Tuff from the Deakin Volcanics 1638:and in southern Yarralumla, and also 472:deposited in a marine environment as 356: 220:. These rocks are an addition to the 68:formation that was formed around 425 3345:Geoscience Australia database record 3277: 3208: 3123: 3042: 3012: 2557:Shannons Flat Granodiorite from the 1640:Hughes, Australian Capital Territory 1636:Deakin, Australian Capital Territory 1346:. Maximum thickness is 1770 m. 986:Aranda, Australian Capital Territory 598:to the continent. During this stage 571:from the batholith became elevated. 3429: 3424:Earth and Planetary Science Letters 3117: 2195:. They are up to 850 metres thick. 1675:Lyons, Australian Capital Territory 259:, but the Molong-Monaro Terrane in 180: 13: 2542:and the rock is easily weathered. 2395:The Uriarra Volcanics consists of 352:Trough outside the west of the ACT 232:The Tasmanides also extended into 14: 3993: 3688:Heard Island and McDonald Islands 2823: 2078:apart from Curtin, and across to 814:have been found at the location. 3849: 3718: 3706: 3489:1:100000 Canberra Geological Map 2845: 2810: 2787:groundmass. Kaersutite contains 2694:and pale in comparison to other 2436:Late Silurian to Middle Devonian 2125:in lesser amounts and flakes of 3513: 3492: 3483: 3461: 3416: 3398: 3368: 3349: 3338: 3316: 3299: 3184: 3175: 2179:. They exist in the suburbs of 2046:(Mugga Mugga Porphyry Member), 1681:. There may also be a patch in 822: 247:The ACT is part of the Eastern 200:. The ACT is positioned on the 30:includes rocks dating from the 3668:Australian Antarctic Territory 3163: 3108: 3066: 3036: 3006: 2984: 2942: 2686:is found at Mount Tennant and 2658: 2650: 2642: 2634: 2606: 2598: 2590: 2582: 2507: 2499: 2491: 2483: 2475: 2206:over a few square kilometres. 1973: 1962: 1951: 1940: 1929: 1918: 1900: 1886: 1875: 1860: 1846: 1828: 1817: 1806: 1791: 1776: 1758: 1513: 1499: 1484: 1473: 1458: 1447: 1432: 1414: 1403: 1385: 1092:from the turbidites have been 968: 960: 952: 937: 925: 913: 905: 897: 889: 881: 866: 855: 1: 2936: 2805: 2293:, the Town Center and Bruce. 1677:north north west towards the 1642:. The formation extends from 361: 3767:Australian Capital Territory 3633:Australian Capital Territory 3307:Canberra, a nation's Capital 3221:. Geoscience Australia. 1990 3197:Australian Heritage Database 3049:Australian Heritage Database 3019:Australian Heritage Database 2900: 2616: 2564: 2457: 2167:. They are the top layer of 2156:The Laidlaw volcanics are a 1726: 1673:Another band stretches from 1353: 826: 817: 508:Colinton Volcanics south of 453:Sandstone deposited on top. 212:, the deformed rocks of the 171:Australian Capital Territory 7: 3663:Ashmore and Cartier Islands 2912: 2858:field occur at the head of 2791:and has a formula near NaCa 2783:, embedded in a colourless 2572:Shannons Flat Granodiorite 2220:occur throughout the area. 2062:. It also is found through 1734:Deakin Volcanics chemistry 1630:from the Deakin Volcanics. 574: 134:, a nephew of the explorer 10: 3998: 2993:Woolshed Creek Fossil Site 2929:Most soils in the ACT are 2866:. 1 μm·s is 0.1  2546:Shannons Flat Granodiorite 2133:introduces some veins and 236:in the south and northern 102:Limestone outcrop at Acton 3955: 3899: 3858: 3847: 3773: 3701: 3651: 3621: 3578: 3443:Finlayson, D. M. (2008). 3380:www.aussieheritage.com.au 3126:"The Balconnel Gold Mine" 2623: 2571: 2465:Clear Range Granodiorite 2464: 2419:crystals. The tuff shows 2004:Deakin Volcanics red tuff 1733: 1360: 833: 714: 288:Cullarin Horst (north of 267:Canberra region structure 2454:Clear Range Granodiorite 1193:Black Mountain Sandstone 1086:Transantarctic Mountains 532:was erupted followed by 445:) was raised higher. An 93:William Branwhite Clarke 3678:Cocos (Keeling) Islands 3153:Australian Mineralogist 2952:. Australian Government 2924: 2253:Late Silurian to early 1709:. These volcanics lack 1591:Mount Painter Volcanics 425:and animal organic and 3471:. Geoscience Australia 3326:. Geoscience Australia 3309:, ed H. L. White 1954 3287:. Geoscience Australia 3265:. Geoscience Australia 3243:. Geoscience Australia 3096:Cite journal requires 2990:ACT Heritage Council: 2972:Cite journal requires 2950:"Geoscience Australia" 2741: 2678:Booroomba Leucogranite 2640:Microcline K-feldspar 2588:Microcline K-feldspar 2562: 2481:Microcline K-feldspar 2441:Murrumbidgee Batholith 2382:Paddys River Volcanics 2366: 2231:. A coarse green grey 2153: 2005: 1997: 1989: 584: 484:Basin remained in the 421:reached and only fine 148: 103: 23: 3202:Australian Government 3054:Australian Government 3024:Australian Government 2739: 2556: 2364: 2281:Glebe Farm Adamellite 2151: 2003: 1995: 1987: 1232:Tidbinbilla Quartzite 1173:, north and south of 589:Molong-Monaro Terrane 582: 144: 132:Charles Throsby Smith 101: 21: 3816:Legislative Assembly 3713:Australia portal 3654:External territories 3638:Jervis Bay Territory 3624:Mainland territories 3572:Geology of Australia 2840:Magnetic inclination 2836:Magnetic declination 2626:Mineral Composition 2574:Mineral Composition 2467:Mineral Composition 2227:intrusions could be 2082:, and south through 1621:Yarralumla Formation 1241:Late Middle Silurian 622:, and conversion of 551:block is called the 208:. The ACT is in the 202:Australian continent 55:Yarralumla Formation 3311:Angus and Robertson 3132:on 28 December 2013 2034:and red and yellow 2014:Tuggeranong Parkway 1656:Lake Burley Griffin 1147:Late Early Silurian 1065:because of the low 1036:, and occasionally 457:Silurian deposition 334:Goodradigbee Graben 196:or downthrown into 156:Lake Burley Griffin 130:, a constable, and 126:was accompanied by 3982:Silurian volcanism 3725:Geology portal 3643:Northern Territory 3362:2008-07-25 at the 3358:Heritage Register 2998:2008-07-25 at the 2907:Blundell's Cottage 2742: 2624:Tharwa Adamellite 2563: 2367: 2301:Also known as the 2272:Murrumbidgee River 2173:Murrumbidgee River 2154: 2006: 1998: 1990: 1602:Xenoliths include 1543:and some have red 1246:Canberra Formation 1152:State Circle Shale 1094:isotopically dated 1004:, micaceous sandy 996:, exposed east of 836:Chemical Analysis 834:Pittman Formation 705:Southern Highlands 697:Murrumbidgee River 585: 583:Dyke of teschenite 542:Murrumbidgee River 419:turbidity currents 413:off the side of a 411:turbidity currents 368:Delamerian Orogeny 357:Geological history 120:Murrumbidgee River 104: 51:volcanic eruptions 24: 3964: 3963: 3733: 3732: 3683:Coral Sea Islands 3613:Western Australia 3386:on 14 August 2008 3192:"Place ID 105733" 2670:Tharwa Adamellite 2667: 2666: 2663: 2662: 2615: 2614: 2611: 2610: 2516: 2515: 2512: 2511: 2391:Uriarra Volcanics 2303:Greenwood Granite 2144:Laidlaw Volcanics 1982: 1981: 1978: 1977: 1522: 1521: 1518: 1517: 1350:Ainslie Volcanics 1317:Hawkins Volcanics 1098:Australian Shield 980:Pittman Formation 977: 976: 973: 972: 504:layers included. 415:continental slope 249:Lachlan Fold Belt 160:volcanic activity 116:Lachlan Macquarie 70:million years ago 44:Pittman Formation 3989: 3958:Australia portal 3859:Cities and towns 3853: 3831:Public transport 3760: 3753: 3746: 3737: 3736: 3723: 3722: 3711: 3710: 3709: 3673:Christmas Island 3656: 3626: 3565: 3558: 3551: 3542: 3541: 3508: 3496: 3490: 3487: 3481: 3480: 3478: 3476: 3465: 3459: 3458: 3440: 3427: 3420: 3414: 3413: 3402: 3396: 3395: 3393: 3391: 3382:. Archived from 3372: 3366: 3353: 3347: 3342: 3336: 3335: 3333: 3331: 3320: 3314: 3303: 3297: 3296: 3294: 3292: 3281: 3275: 3274: 3272: 3270: 3259: 3253: 3252: 3250: 3248: 3237: 3231: 3230: 3228: 3226: 3215: 3206: 3205: 3188: 3182: 3179: 3173: 3167: 3161: 3160: 3148: 3142: 3141: 3139: 3137: 3128:. Archived from 3121: 3115: 3112: 3106: 3105: 3099: 3094: 3092: 3084: 3082: 3081: 3070: 3064: 3063: 3061: 3060: 3040: 3034: 3033: 3031: 3030: 3010: 3004: 2988: 2982: 2981: 2975: 2970: 2968: 2960: 2958: 2957: 2946: 2919:Australian Plate 2872:Lake Tuggeranong 2779:, and about 15% 2768:, pinkish brown 2724:, and higher in 2621: 2620: 2617: 2569: 2568: 2565: 2561:Tracking Station 2462: 2461: 2458: 2311:Canberra Airport 1731: 1730: 1727: 1723:Deakin Volcanics 1650:in the South to 1358: 1357: 1354: 1334:, Mount Rogers, 1308:Walker Volcanics 1076:, consisting of 1016:and radiolarian 831: 830: 827: 764:copper carbonate 614:, conversion of 612:saussuritisation 431:submarine trench 344:Long Plain Fault 329:Tantangara Fault 283:Ballallaba Fault 192:, uplifted into 181:Tectonic context 91:by the Reverend 3997: 3996: 3992: 3991: 3990: 3988: 3987: 3986: 3967: 3966: 3965: 3960: 3951: 3895: 3854: 3845: 3769: 3764: 3734: 3729: 3717: 3707: 3705: 3697: 3652: 3647: 3622: 3617: 3598:South Australia 3588:New South Wales 3574: 3569: 3516: 3511: 3507:22, 2003, p. 46 3497: 3493: 3488: 3484: 3474: 3472: 3467: 3466: 3462: 3455: 3441: 3430: 3421: 3417: 3404: 3403: 3399: 3389: 3387: 3374: 3373: 3369: 3364:Wayback Machine 3354: 3350: 3343: 3339: 3329: 3327: 3322: 3321: 3317: 3304: 3300: 3290: 3288: 3283: 3282: 3278: 3268: 3266: 3261: 3260: 3256: 3246: 3244: 3239: 3238: 3234: 3224: 3222: 3217: 3216: 3209: 3189: 3185: 3180: 3176: 3168: 3164: 3149: 3145: 3135: 3133: 3122: 3118: 3113: 3109: 3097: 3095: 3086: 3085: 3079: 3077: 3072: 3071: 3067: 3058: 3056: 3041: 3037: 3028: 3026: 3011: 3007: 3000:Wayback Machine 2989: 2985: 2973: 2971: 2962: 2961: 2955: 2953: 2948: 2947: 2943: 2939: 2927: 2915: 2903: 2852:gravity anomaly 2848: 2843: 2826: 2815:In the ACT the 2813: 2808: 2798: 2794: 2688:Booroomba Rocks 2438: 2432:Pierces Creek. 2343:contact aureole 2105:, and deep red 1916: 1912: 1898: 1872: 1858: 1844: 1840: 1803: 1788: 1774: 1770: 1756: 1511: 1496: 1470: 1444: 1430: 1426: 1401: 1397: 1383: 1243: 1149: 1072:The Ordovician 950: 946: 934: 922: 879: 875: 864: 853: 825: 820: 717: 701:Snowy Mountains 577: 459: 376:South Australia 374:and in eastern 364: 359: 269: 261:New South Wales 183: 136:Charles Throsby 12: 11: 5: 3995: 3985: 3984: 3979: 3962: 3961: 3956: 3953: 3952: 3950: 3949: 3944: 3939: 3934: 3929: 3924: 3919: 3914: 3909: 3903: 3901: 3897: 3896: 3894: 3893: 3888: 3883: 3878: 3873: 3868: 3862: 3860: 3856: 3855: 3848: 3846: 3844: 3843: 3838: 3833: 3828: 3823: 3818: 3813: 3808: 3803: 3798: 3793: 3788: 3783: 3777: 3775: 3771: 3770: 3763: 3762: 3755: 3748: 3740: 3731: 3730: 3728: 3727: 3715: 3702: 3699: 3698: 3696: 3695: 3693:Norfolk Island 3690: 3685: 3680: 3675: 3670: 3665: 3659: 3657: 3649: 3648: 3646: 3645: 3640: 3635: 3629: 3627: 3619: 3618: 3616: 3615: 3610: 3605: 3600: 3595: 3590: 3584: 3582: 3576: 3575: 3568: 3567: 3560: 3553: 3545: 3539: 3538: 3535: 3532: 3529: 3526: 3523: 3520: 3515: 3512: 3510: 3509: 3491: 3482: 3460: 3453: 3428: 3415: 3410:asud.ga.gov.au 3397: 3367: 3348: 3337: 3315: 3298: 3276: 3254: 3232: 3207: 3183: 3174: 3162: 3143: 3116: 3107: 3098:|journal= 3065: 3035: 3005: 2983: 2974:|journal= 2940: 2938: 2935: 2926: 2923: 2914: 2911: 2902: 2899: 2847: 2844: 2834: 2825: 2824:Magnetic field 2822: 2812: 2809: 2807: 2804: 2796: 2792: 2734: 2733: 2713:Granodiorite. 2680: 2679: 2672: 2671: 2665: 2664: 2661: 2660: 2657: 2653: 2652: 2649: 2645: 2644: 2641: 2637: 2636: 2633: 2629: 2628: 2613: 2612: 2609: 2608: 2605: 2601: 2600: 2597: 2593: 2592: 2589: 2585: 2584: 2581: 2577: 2576: 2548: 2547: 2534:with numerous 2514: 2513: 2510: 2509: 2506: 2502: 2501: 2498: 2494: 2493: 2490: 2486: 2485: 2482: 2478: 2477: 2474: 2470: 2469: 2456: 2455: 2443: 2442: 2437: 2434: 2393: 2392: 2384: 2383: 2376:Gudgenby River 2359: 2358: 2357:Adaminaby Beds 2299: 2298: 2297:Sutton Granite 2283: 2282: 2229:volcanic necks 2212: 2211: 2146: 2145: 2121:, pink potash 2101:, light green 1980: 1979: 1976: 1975: 1972: 1969: 1965: 1964: 1961: 1958: 1954: 1953: 1950: 1947: 1943: 1942: 1939: 1936: 1932: 1931: 1928: 1925: 1921: 1920: 1917: 1914: 1910: 1907: 1903: 1902: 1899: 1896: 1893: 1889: 1888: 1885: 1882: 1878: 1877: 1874: 1870: 1867: 1863: 1862: 1859: 1856: 1853: 1849: 1848: 1845: 1842: 1838: 1835: 1831: 1830: 1827: 1824: 1820: 1819: 1816: 1813: 1809: 1808: 1805: 1801: 1798: 1794: 1793: 1790: 1786: 1783: 1779: 1778: 1775: 1772: 1768: 1765: 1761: 1760: 1757: 1754: 1751: 1747: 1746: 1743: 1740: 1736: 1735: 1725: 1724: 1691: 1690: 1679:Molonglo River 1666:and primitive 1623: 1622: 1613:or early Late 1593: 1592: 1567:from the Late 1556:Molonglo River 1520: 1519: 1516: 1515: 1512: 1509: 1506: 1502: 1501: 1498: 1494: 1491: 1487: 1486: 1483: 1480: 1476: 1475: 1472: 1468: 1465: 1461: 1460: 1457: 1454: 1450: 1449: 1446: 1442: 1439: 1435: 1434: 1431: 1428: 1424: 1421: 1417: 1416: 1413: 1410: 1406: 1405: 1402: 1399: 1395: 1392: 1388: 1387: 1384: 1381: 1378: 1374: 1373: 1370: 1367: 1363: 1362: 1352: 1351: 1319: 1318: 1310: 1309: 1248: 1247: 1242: 1239: 1234: 1233: 1214:Black Mountain 1195: 1194: 1175:Black Mountain 1154: 1153: 1148: 1145: 1110: 1109: 982: 981: 975: 974: 971: 970: 967: 963: 962: 959: 955: 954: 951: 948: 944: 940: 939: 936: 932: 928: 927: 924: 920: 916: 915: 912: 908: 907: 904: 900: 899: 896: 892: 891: 888: 884: 883: 880: 877: 873: 869: 868: 865: 862: 858: 857: 854: 851: 847: 846: 843: 839: 838: 824: 821: 819: 816: 716: 713: 608:sericitisation 576: 573: 520:Formation and 467:Black Mountain 458: 455: 451:Black Mountain 439:Early Silurian 382:, and western 363: 360: 358: 355: 354: 353: 347: 346: 345: 336: 335: 332: 331: 330: 324: 323: 322: 313: 312: 306: 305: 304: 286: 285: 284: 278: 277: 276: 268: 265: 227:plate tectonic 182: 179: 9: 6: 4: 3: 2: 3994: 3983: 3980: 3978: 3975: 3974: 3972: 3959: 3954: 3948: 3945: 3943: 3940: 3938: 3935: 3933: 3930: 3928: 3925: 3923: 3920: 3918: 3915: 3913: 3910: 3908: 3905: 3904: 3902: 3898: 3892: 3889: 3887: 3884: 3882: 3879: 3877: 3874: 3872: 3869: 3867: 3864: 3863: 3861: 3857: 3852: 3842: 3839: 3837: 3834: 3832: 3829: 3827: 3824: 3822: 3819: 3817: 3814: 3812: 3809: 3807: 3804: 3802: 3799: 3797: 3794: 3792: 3789: 3787: 3784: 3782: 3779: 3778: 3776: 3772: 3768: 3761: 3756: 3754: 3749: 3747: 3742: 3741: 3738: 3726: 3721: 3716: 3714: 3704: 3703: 3700: 3694: 3691: 3689: 3686: 3684: 3681: 3679: 3676: 3674: 3671: 3669: 3666: 3664: 3661: 3660: 3658: 3655: 3650: 3644: 3641: 3639: 3636: 3634: 3631: 3630: 3628: 3625: 3620: 3614: 3611: 3609: 3606: 3604: 3601: 3599: 3596: 3594: 3591: 3589: 3586: 3585: 3583: 3581: 3577: 3573: 3566: 3561: 3559: 3554: 3552: 3547: 3546: 3543: 3536: 3533: 3530: 3527: 3524: 3521: 3518: 3517: 3506: 3503: 3502: 3499:P. Tregoning: 3495: 3486: 3470: 3464: 3456: 3454:9780646487342 3450: 3446: 3439: 3437: 3435: 3433: 3425: 3419: 3411: 3407: 3401: 3385: 3381: 3377: 3371: 3365: 3361: 3357: 3352: 3346: 3341: 3325: 3319: 3312: 3308: 3302: 3286: 3280: 3264: 3258: 3242: 3236: 3220: 3214: 3212: 3203: 3199: 3198: 3193: 3187: 3178: 3171: 3166: 3158: 3154: 3147: 3131: 3127: 3124:Mark (2006). 3120: 3111: 3103: 3090: 3075: 3069: 3055: 3051: 3050: 3045: 3039: 3025: 3021: 3020: 3015: 3009: 3002: 3001: 2997: 2994: 2987: 2979: 2966: 2951: 2945: 2941: 2934: 2932: 2922: 2920: 2910: 2908: 2898: 2895: 2893: 2892:Mount Stromlo 2888: 2886: 2881: 2877: 2873: 2869: 2865: 2861: 2857: 2853: 2846:Gravity field 2841: 2837: 2833: 2830: 2821: 2818: 2811:Seismic waves 2803: 2800: 2790: 2786: 2782: 2778: 2775: 2771: 2767: 2763: 2758: 2755: 2751: 2747: 2738: 2731: 2730: 2729: 2727: 2723: 2719: 2716:It is low in 2714: 2712: 2711:Shannons Flat 2708: 2705: 2701: 2697: 2693: 2689: 2685: 2677: 2676: 2675: 2669: 2668: 2655: 2654: 2647: 2646: 2639: 2638: 2631: 2630: 2627: 2622: 2619: 2618: 2603: 2602: 2595: 2594: 2587: 2586: 2579: 2578: 2575: 2570: 2567: 2566: 2560: 2555: 2551: 2545: 2544: 2543: 2541: 2537: 2533: 2529: 2525: 2521: 2504: 2503: 2496: 2495: 2488: 2487: 2480: 2479: 2472: 2471: 2468: 2463: 2460: 2459: 2453: 2452: 2451: 2448: 2440: 2439: 2433: 2430: 2426: 2422: 2418: 2413: 2409: 2405: 2401: 2398: 2390: 2389: 2388: 2381: 2380: 2379: 2377: 2372: 2363: 2356: 2355: 2354: 2352: 2348: 2344: 2340: 2339:metamorphosed 2336: 2332: 2328: 2324: 2321:, milky grey 2320: 2316: 2312: 2308: 2304: 2296: 2295: 2294: 2292: 2288: 2280: 2279: 2278: 2275: 2273: 2268: 2266: 2261: 2258: 2256: 2251: 2248: 2244: 2242: 2241:magma chamber 2238: 2234: 2230: 2226: 2221: 2219: 2216: 2209: 2208: 2207: 2205: 2201: 2196: 2194: 2190: 2186: 2182: 2178: 2174: 2170: 2166: 2162: 2159: 2150: 2143: 2142: 2141: 2139: 2136: 2132: 2128: 2124: 2120: 2116: 2112: 2108: 2104: 2100: 2095: 2093: 2089: 2085: 2081: 2077: 2073: 2069: 2065: 2061: 2057: 2053: 2049: 2045: 2041: 2037: 2033: 2029: 2025: 2022: 2019: 2015: 2011: 2002: 1994: 1986: 1974:100 ppm 1970: 1967: 1966: 1963:125 ppm 1959: 1956: 1955: 1952:210 ppm 1948: 1945: 1944: 1937: 1934: 1933: 1930:540 ppm 1926: 1923: 1922: 1908: 1905: 1904: 1894: 1891: 1890: 1883: 1880: 1879: 1868: 1865: 1864: 1854: 1851: 1850: 1836: 1833: 1832: 1825: 1822: 1821: 1814: 1811: 1810: 1799: 1796: 1795: 1784: 1781: 1780: 1766: 1763: 1762: 1752: 1749: 1748: 1744: 1741: 1738: 1737: 1732: 1729: 1728: 1722: 1721: 1720: 1718: 1716: 1712: 1708: 1704: 1700: 1696: 1689:Yass Subgroup 1688: 1687: 1686: 1684: 1680: 1676: 1671: 1669: 1665: 1661: 1657: 1653: 1649: 1645: 1641: 1637: 1631: 1628: 1620: 1619: 1618: 1616: 1612: 1611:Wenlock epoch 1607: 1605: 1600: 1598: 1590: 1589: 1588: 1585: 1581: 1576: 1574: 1571:epoch of the 1570: 1565: 1561: 1557: 1553: 1549: 1546: 1542: 1538: 1534: 1531: 1527: 1507: 1504: 1503: 1492: 1489: 1488: 1481: 1478: 1477: 1466: 1463: 1462: 1455: 1452: 1451: 1440: 1437: 1436: 1422: 1419: 1418: 1411: 1408: 1407: 1393: 1390: 1389: 1379: 1376: 1375: 1371: 1368: 1365: 1364: 1359: 1356: 1355: 1349: 1348: 1347: 1345: 1341: 1337: 1333: 1329: 1325: 1316: 1315: 1314: 1307: 1306: 1305: 1302: 1298: 1293: 1291: 1287: 1283: 1279: 1274: 1272: 1269: 1265: 1261: 1257: 1253: 1250:In the 1840s 1245: 1244: 1238: 1231: 1230: 1229: 1227: 1223: 1220:period, late 1219: 1215: 1211: 1207: 1203: 1200: 1192: 1191: 1190: 1188: 1184: 1180: 1176: 1172: 1168: 1163: 1159: 1151: 1150: 1144: 1141: 1138: 1134: 1131: 1127: 1123: 1119: 1115: 1107: 1106: 1105: 1101: 1099: 1095: 1091: 1087: 1083: 1079: 1075: 1070: 1068: 1064: 1060: 1056: 1051: 1048: 1043: 1039: 1035: 1031: 1027: 1023: 1019: 1015: 1011: 1007: 1003: 999: 995: 991: 990:Captains Flat 987: 979: 978: 965: 964: 961:168 ppm 957: 956: 942: 941: 930: 929: 918: 917: 910: 909: 902: 901: 894: 893: 886: 885: 871: 870: 860: 859: 849: 848: 844: 841: 840: 837: 832: 829: 828: 815: 813: 809: 805: 804:native silver 801: 797: 793: 789: 785: 781: 777: 773: 768: 765: 761: 758:A deposit of 756: 754: 750: 746: 742: 738: 734: 730: 726: 722: 712: 710: 706: 702: 698: 694: 691: 687: 682: 678: 675: 671: 668: 664: 659: 657: 653: 649: 645: 641: 637: 633: 629: 625: 621: 617: 613: 609: 605: 601: 597: 592: 590: 581: 572: 570: 566: 563:beneath. The 562: 561:oceanic crust 559: 554: 550: 545: 543: 539: 535: 531: 527: 523: 519: 515: 511: 505: 503: 499: 495: 489: 487: 486:Captains Flat 483: 479: 475: 471: 468: 464: 461:State Circle 454: 452: 448: 444: 440: 434: 432: 428: 424: 420: 416: 412: 408: 404: 400: 395: 393: 389: 385: 381: 377: 373: 369: 351: 348: 343: 342: 341: 340: 339: 333: 328: 327: 326:Cotter Horst 325: 320: 319: 318: 317: 316: 311: 307: 302: 301: 299: 295: 291: 287: 282: 281: 279: 275:Narongo Fault 274: 273: 271: 270: 264: 262: 258: 254: 250: 245: 243: 239: 235: 230: 228: 223: 219: 215: 211: 207: 203: 199: 195: 191: 187: 178: 176: 172: 167: 165: 161: 157: 153: 147: 143: 141: 137: 133: 129: 128:James Vaughan 125: 121: 117: 113: 109: 100: 96: 94: 90: 86: 82: 78: 75:In the 1840s 73: 71: 67: 63: 60: 56: 52: 47: 45: 41: 37: 33: 29: 20: 16: 3922:Murrumbidgee 3891:Williamsdale 3800: 3632: 3514:Bibliography 3504: 3500: 3494: 3485: 3473:. Retrieved 3463: 3444: 3423: 3418: 3409: 3400: 3388:. Retrieved 3384:the original 3379: 3370: 3351: 3340: 3328:. Retrieved 3318: 3306: 3301: 3289:. Retrieved 3279: 3267:. Retrieved 3257: 3245:. Retrieved 3235: 3223:. Retrieved 3195: 3186: 3177: 3169: 3165: 3156: 3152: 3146: 3134:. Retrieved 3130:the original 3119: 3110: 3089:cite journal 3078:. Retrieved 3068: 3057:. Retrieved 3047: 3038: 3027:. Retrieved 3017: 3008: 2991: 2986: 2965:cite journal 2954:. Retrieved 2944: 2928: 2916: 2904: 2896: 2889: 2849: 2831: 2827: 2814: 2801: 2759: 2743: 2715: 2707:Granodiorite 2684:Leucogranite 2681: 2673: 2648:Plagioclase 2625: 2596:Plagioclase 2573: 2549: 2517: 2489:Plagioclase 2466: 2444: 2406:deposits of 2394: 2385: 2368: 2349:and spotted 2302: 2300: 2284: 2276: 2269: 2265:Mount Taylor 2262: 2259: 2252: 2249: 2245: 2222: 2213: 2197: 2193:Ludlow epoch 2155: 2135:saccharoidal 2096: 2064:Weston Creek 2007: 1719: 1692: 1672: 1632: 1624: 1608: 1601: 1594: 1580:Mount Majura 1577: 1524:Named after 1523: 1320: 1311: 1294: 1275: 1249: 1235: 1226:fanglomerate 1222:Llandoverian 1196: 1158:Llandoverian 1155: 1142: 1111: 1102: 1071: 1052: 1030:radiolarians 1014:argillaceous 983: 969:64 ppm 835: 796:hydrozincite 792:hemimorphite 776:aurichalcite 772:Paddys River 769: 757: 718: 683: 679: 660: 600:metamorphism 593: 586: 546: 514:Williamsdale 506: 490: 460: 447:unconformity 435: 396: 394:in the ACT. 365: 337: 314: 310:Williamsdale 246: 231: 184: 168: 149: 145: 105: 74: 54: 48: 43: 27: 25: 15: 3947:Tidbinbilla 3876:Oaks Estate 3475:28 December 3330:28 December 3291:28 December 3269:28 December 3247:28 December 3225:28 December 3136:28 December 2880:Oaks Estate 2770:titanaugite 2764:altered to 2704:Clear Range 2692:crystalline 2559:Tidbinbilla 2528:Clear Range 2404:pyroclastic 2329:, and with 2233:rhyodacitic 2215:Porphyrytic 2183:, Chapman, 2119:plagioclase 2111:phenocrysts 2084:Tuggeranong 2040:Tuggeranong 2021:rhyodacitic 2018:interbedded 1297:Narrabundah 1256:brachiopods 1177:, and from 1122:Brachiopods 1118:graptolites 1116:containing 1108:Acton Shale 1088:. Detrital 1047:Oaks Estate 1038:brachiopods 1026:graptolites 780:bronchanite 709:Lake George 663:Googong Dam 656:pumpellyite 616:plagioclase 604:greenschist 526:sedimentary 478:Wagga Wagga 443:Wagga Wagga 397:During the 372:Broken Hill 294:Oaks Estate 229:movements. 222:Proterozoic 218:Tasman Line 124:Joseph Wild 114:, Governor 108:Lake George 81:brachiopods 59:sedimentary 3971:Categories 3942:Queanbeyan 3806:Government 3593:Queensland 3080:2007-10-11 3059:2007-10-11 3029:2007-10-11 2956:2007-10-11 2937:References 2860:Yass River 2806:Geophysics 2799:Ti)O(OH). 2774:kaersutite 2766:serpentine 2750:teschenite 2682:Booroomba 2536:inclusions 2505:Muscovite 2402:flows and 2331:hornblende 2218:intrusions 2161:ignimbrite 2158:rhydacitic 2092:celadonite 2074:, through 2024:ignimbrite 1711:cordierite 1660:trilobites 1652:Yarralumla 1627:Yarralumla 1604:jasperised 1569:Wenlockian 1541:cordierite 1533:ignimbrite 1260:trilobites 1137:Ordovician 1074:turbidites 998:Queanbeyan 823:Ordovician 812:zincsilite 784:caledonite 693:teschenite 530:rhyodacite 524:Formation 518:Yarralumla 510:Queanbeyan 474:turbidites 399:Palaeozoic 378:, western 362:Ordovician 296:, most of 290:Queanbeyan 234:Antarctica 210:Tasmanides 112:Yass River 85:trilobites 53:, but the 32:Ordovician 3796:Geography 3786:Education 3390:6 January 3159:: 83–100. 2901:Heat flow 2868:milligals 2781:magnetite 2777:amphibole 2726:potassium 2700:Muscovite 2540:mylonitic 2429:limestone 2410:. A fine 2371:turbidite 2335:xenoliths 2289:, Melba, 2210:Porphyrys 2204:limestone 2189:Ludlovian 2177:Belconnen 2169:Volcanics 2066:north of 2060:MacGregor 2056:Charnwood 2032:siltstone 2028:sandstone 1745:% or ppm 1707:limestone 1699:sandstone 1560:aluminium 1545:almandine 1537:sediments 1372:% or ppm 1262:from the 1208:and grey 1206:siltstone 1202:sandstone 1187:Ngunnawal 1162:lithology 1126:conodonts 1078:greywacke 1069:content. 1063:strontium 1034:conodonts 1002:sandstone 994:greywacke 845:% or ppm 818:Lithology 788:cerussite 667:Psammitic 640:Belconnen 512:and near 494:limestone 470:Sandstone 407:Sediments 403:subducted 392:obduction 186:Tectonics 175:Batholith 140:limestone 66:siltstone 40:Australia 3917:Molonglo 3912:Gudgenby 3866:Canberra 3608:Victoria 3603:Tasmania 3360:Archived 3313:, p. 143 2996:Archived 2913:Movement 2789:titanium 2785:analcime 2772:, brown 2696:granites 2656:Biotite 2604:Biotite 2532:foliated 2497:Biotite 2425:Porphyry 2417:feldspar 2412:ashstone 2347:hornfels 2325:, black 2319:feldspar 2315:Silurian 2291:McKellar 2255:Devonian 2225:Silurian 2131:Tonalite 2123:feldspar 2107:hematite 2088:hematite 1703:ashstone 1668:crinoids 1644:Red Hill 1615:Silurian 1573:Silurian 1301:Ashstone 1282:Kingston 1278:Fyshwick 1268:Duntroon 1264:Silurian 1218:Silurian 1082:phyllite 1067:feldspar 1012:, black 1010:mudstone 808:rozenite 800:linarite 753:concrete 745:Pialligo 674:pellitic 652:prehnite 632:titanite 628:chlorite 575:Devonian 569:granites 558:basaltic 549:tectonic 538:rhyolite 502:ashstone 388:Cambrian 384:Tasmania 380:Victoria 257:Victoria 242:Gondwana 206:Gondwana 164:Devonian 110:and the 89:Duntroon 62:mudstone 36:Silurian 3932:Orroral 3886:Uriarra 3841:Symbols 3811:History 3801:Geology 3781:Economy 3774:General 2931:Podzols 2856:gravity 2762:olivine 2722:calcium 2632:Quartz 2580:Quartz 2524:Thredbo 2473:Quartz 2421:bedding 2327:biotite 2307:granite 2223:Middle 2127:biotite 2117:, grey 2103:epidote 2099:calcite 2068:Chapman 2052:breccia 1834:  1777:13.33% 1759:72.99% 1564:pelitic 1530:Dacitic 1420:  1404:14.28% 1252:fossils 1133:fossils 1130:sponges 1090:zircons 1059:calcium 1042:sponges 1022:bedding 882:13.76% 856:71.23% 711:Fault. 690:olivine 636:epidote 624:biotite 596:terrane 253:Terrane 198:grabens 162:in the 77:fossils 3937:Paddys 3907:Cotter 3900:Rivers 3881:Tharwa 3826:Police 3821:People 3580:States 3451:  2876:Kambah 2754:Kambah 2651:29.1% 2643:29.7% 2635:34.1% 2599:34.7% 2591:21.0% 2583:36.0% 2520:Tharwa 2500:16.1% 2492:34.2% 2476:33.9% 2397:dacite 2351:schist 2323:quartz 2185:Kambah 2181:Latham 2138:galena 2115:quartz 2109:. The 2072:Fisher 2010:Deakin 1941:0.03% 1919:0.06% 1901:0.22% 1887:0.49% 1876:1.12% 1847:0.53% 1818:1.73% 1807:2.98% 1792:3.78% 1742:oxide 1739:order 1715:garnet 1584:Harman 1562:-rich 1552:Jasper 1548:garnet 1514:0.59% 1500:2.05% 1485:2.15% 1459:2.61% 1433:0.79% 1415:3.42% 1386:66.8% 1369:oxide 1366:order 1332:Spence 1328:Fraser 1324:Dunlop 1290:Parkes 1286:Barton 1199:quartz 1179:Lawson 1167:Parkes 1160:. Its 1055:sodium 953:0.13% 938:3.54% 926:1.02% 914:0.31% 906:1.90% 898:0.05% 890:4.74% 867:0.64% 842:oxide 810:, and 760:galena 749:gravel 741:Quarry 737:copper 735:, and 729:silver 721:mining 719:Minor 715:Mining 670:schist 648:Kambah 646:, and 620:albite 565:magmas 553:Cotter 498:dacite 488:area. 482:Monaro 427:silica 214:orogen 194:horsts 190:faults 3836:Sport 2885:weigh 2659:7.1% 2607:8.3% 2508:1.8% 2484:8.9% 2447:Cooma 2341:in a 2333:rich 2287:Flynn 2200:shale 2198:Some 2076:Woden 2036:shale 1861:1.6% 1829:0.9% 1695:shale 1664:coral 1648:Woden 1474:2.5% 1448:3.8% 1340:Melba 1336:Flynn 1210:shale 1183:Crace 1181:, to 1171:Acton 1114:shale 1018:chert 1006:shale 755:mix. 644:Duffy 463:Shale 350:Cowra 298:Kowen 238:China 152:Acton 57:is a 3927:Naas 3871:Hall 3791:Flag 3477:2013 3449:ISBN 3392:2019 3332:2013 3293:2013 3271:2013 3249:2013 3227:2013 3138:2013 3102:help 3003:2004 2978:help 2925:Soil 2864:μm·s 2850:The 2817:Moho 2746:dyke 2720:and 2718:iron 2709:and 2408:tuff 2400:lava 2237:Holt 2165:tuff 2113:are 2080:Hume 2070:and 2058:and 2048:tuff 2044:lava 2008:The 1938:MnO 1884:MgO 1826:FeO 1815:CaO 1705:and 1654:and 1646:and 1597:Öpik 1482:MgO 1456:CaO 1412:FeO 1344:Hall 1342:and 1288:and 1258:and 1185:and 1128:and 1061:and 1040:and 911:CaO 903:MgO 895:MnO 887:FeO 762:and 751:and 733:lead 725:gold 703:and 686:dyke 672:and 534:tuff 522:Yass 500:and 465:and 423:clay 83:and 26:The 2795:(Mg 2748:of 2522:to 2345:to 1971:Sr 1968:16 1960:Zr 1957:15 1949:Rb 1946:14 1935:13 1927:Ba 1924:12 1906:11 1895:TiO 1892:10 1753:SiO 1713:or 1508:TiO 1380:SiO 1254:of 966:Sr 958:Rb 861:TiO 850:SiO 743:at 688:of 626:to 618:to 255:in 79:of 3973:: 3431:^ 3408:. 3378:. 3210:^ 3200:. 3194:. 3155:. 3093:: 3091:}} 3087:{{ 3052:. 3046:. 3022:. 3016:. 2969:: 2967:}} 2963:{{ 2744:A 2698:. 2267:. 2140:. 2030:, 2026:, 1881:9 1873:O 1869:Na 1866:8 1855:CO 1852:7 1837:Fe 1823:6 1812:5 1804:O 1797:4 1789:O 1782:3 1767:Al 1764:2 1750:1 1717:. 1701:, 1697:, 1670:. 1662:, 1550:. 1505:9 1497:O 1493:Na 1490:8 1479:7 1471:O 1464:6 1453:5 1445:O 1438:4 1423:Fe 1409:3 1394:Al 1391:2 1377:1 1338:, 1330:, 1326:, 1284:, 1280:, 1189:. 1169:, 1124:, 1057:, 1032:, 1028:, 1008:, 935:O 923:O 919:Na 872:Al 806:, 802:, 798:, 794:, 790:, 786:, 782:, 778:, 731:, 727:, 684:A 642:, 634:, 630:, 610:, 433:. 300:) 292:, 263:. 244:. 122:. 72:. 3759:e 3752:t 3745:v 3564:e 3557:t 3550:v 3479:. 3457:. 3412:. 3394:. 3334:. 3295:. 3273:. 3251:. 3229:. 3204:. 3157:3 3140:. 3104:) 3100:( 3083:. 3062:. 3032:. 2980:) 2976:( 2959:. 2797:4 2793:2 1915:5 1913:O 1911:2 1909:P 1897:2 1871:2 1857:2 1843:3 1841:O 1839:2 1802:2 1800:H 1787:2 1785:K 1773:3 1771:O 1769:2 1755:2 1510:2 1495:2 1469:2 1467:H 1443:2 1441:K 1429:3 1427:O 1425:2 1400:3 1398:O 1396:2 1382:2 949:5 947:O 945:2 943:P 933:2 931:K 921:2 878:3 876:O 874:2 863:2 852:2 654:- 64:/

Index


Ordovician
Silurian
Australia
volcanic eruptions
sedimentary
mudstone
siltstone
million years ago
fossils
brachiopods
trilobites
Duntroon
William Branwhite Clarke

Lake George
Yass River
Lachlan Macquarie
Murrumbidgee River
Joseph Wild
James Vaughan
Charles Throsby Smith
Charles Throsby
limestone
Acton
Lake Burley Griffin
volcanic activity
Devonian
Australian Capital Territory
Batholith

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