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Moine Thrust Belt

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547:, and have been dated at 430±4 Ma and 430.6±0.3 Ma respectively suggesting that they were intruded at about the same time. The Loch Ailsh intrusion outcrops within the Ben More thrust sheet and predates movement on that structure. The Loch Borralan intrusion lies beneath the Ben More Thrust. Locally the intrusion has been said to cut across the Ben More Thrust, but a lack of the metamorphic effects found elsewhere along the margin of the intrusion suggest that this contact is tectonic rather than intrusive. In the upper part of the Borralan intrusion, there is evidence of deformation of the syenite while it was still hot, suggesting that thrusting started soon after it was intruded. 349: 32: 367: 20: 388:
in the hanging-wall that is intensely deformed into mylonite, indicating that it originated at a significantly deeper crustal level. Total displacement on this one structure has been estimated as several tens of kilometres based on the change in crustal level and the thickness of mylonites developed. In its central section, south of the Assynt Window, it becomes the sole thrust structure, before the Kinlochewe Thrust branches off to the south.
559:(IUGS) included the 'Moine Thrust Zone' in its assemblage of 100 'geological heritage sites' around the world in a listing published in October 2022. The organisation defines an IUGS Geological Heritage Site as 'a key place with geological elements and/or processes of international scientific relevance, used as a reference, and/or with a substantial contribution to the development of geological sciences through history.' 303:. The Ardvreck Group lies above an angular unconformity over various parts of the Torridon Group and locally over the Lewisian. It is a sequence of mainly quartz arenites. The lowermost part of the Eriboll Formation, the Basal Quartzite Member, is often pebbly at its base. The overlying Pipe Rock Member is a distinctive quartz arenite with many white weathering 387:
The Moine Thrust in the strict sense is the uppermost thrust in the belt and the one that carries the most displacement. In all cases it carries rocks of the Morar Group over rocks of the Hebridean Terrane. Unlike the other thrusts, there is a broad zone (up to 600 m in thickness) of the Morar Group
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were sent into the area by the survey's director Archibald Geikie to carry out detailed mapping. The results of the mapping proved conclusively to Peach and Horne that the contact was tectonic and they were eventually able to persuade Geikie when he visited them briefly in the field in October 1884.
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rocks in the west to an extensive landscape of rolling hills over a metamorphic rock base to the east. Mountains within the belt display complexly folded and faulted layers and the width of the main part of the zone varies up to ten kilometres (six miles), although it is significantly wider on Skye.
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This thrust forms the base of the belt from Eriboll to the southern end of the Assynt Window where it merges with the Moine Thrust itself. It is thought to be the youngest formed thrust structure in the belt, which is consistent with a foreland propagating thrust sequence. Along strike the footwall
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was also active during the late stages of the orogeny, but continued to move during the early Devonian and appears to truncate the southern end of the thrust belt. The total late Caledonian displacement on the Great Glen Fault is poorly constrained, making reconstruction of the southern part of the
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In addition to the Sole Thrust at the base of the northern section of the structure and the Moine Thrust at the top of the belt, many other thrust faults are developed, some of which are large enough to be named and mapped more regionally. The thrust sheet carried by each thrust is named after the
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that act as strain markers in areas of more ductile deformation. The uppermost two parts of the Ardvreck Group form the An t-Sron Formation, with the dolomitic Fucoid Beds Member being overlain by the quartz arenites of the Salterella Grit Member. The succeeding Durness Group consists mainly of
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In the Eriboll section this thrust carries Lewisian gneiss over the Pipe Rock. Its outcrop is complicated by the effects of later thrusting that both folds and offsets the Arnaboll Thrust. The exposures on the flank of Ben Arnaboll have particular importance as it was here that Lapworth first
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as it was one of the first thrust belts discovered and where the importance of large scale horizontal rather than vertical movements became apparent. Detailed mapping of the Moine Thrust Belt by the survey continued for another two decades, culminating in the classic survey memoir
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in which he coined the term "thrust-plane" for these low-angle faults, although the term was probably already in use before then. By 1888 the term "Moine Thrust" was being used for the tectonic break at the base of Moine schists (what is now called the Morar Group of the
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basins in the hanging walls of these faults was interpreted to represent Devonian and Mesozoic extensional reactivation of the Caledonian thrust structures. Further deep profiles acquired in the same area, the DRUM and GRID lines confirmed these features. Onshore in
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The Torridon and Sleat groups are of Neoproterozoic age and consists mainly of sandstone with a maximum preserved thickness of over 8 km. The unconformity at the base of these groups is highly irregular, showing that it was deposited on an eroded land surface.
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The Morar Group, like the Torridon Group, is of Neoproterozoic age and interpreted to be a lateral equivalent of that unit within the overall Wester Ross Supergroup. The Morar Group forms the lowest
458:, the Kishorn Thrust also marks the base of the Moine Thrust Belt bringing mainly Torridonian sandstones over foreland Cambrian-Ordovician limestones and quartzites. Locally on the 218:
to its southeast. The thrust carried metamorphic material over 200 km across Scotland entirely masking the geology of the previous terrane. However, small windows, such as the
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The relationship between the Moine Thrust Belt and other Scandian age structures in Scandinavia and East Greenland remains unclear, due to uncertainties associated with the
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The distinctive character of this sequence enabled detailed mapping, even in areas of relatively poor exposure and allowed sections repeated by thrusting to be recognised.
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that the change was a purely metamorphic effect and that the upper gneiss was younger than the sediments beneath. Initially he was supported in this interpretation by
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Movement on the Moine Thrust Belt has been dated partly on its relationship with a series of igneous intrusions in the Assynt Window and partly from the results of
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to the Achnashellach Culmination, where it is truncated by the SW–NE trending Strathcarron Fault. It may originally have been continuous with the Kishorn Thrust.
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group in 1981 a series of east-dipping fault zones were imaged, two of which were interpreted as potential continuations of the Moine Thrust. The presence of
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Southwest of Skye the course of the Moine Thrust Belt becomes uncertain. It is assumed that it must pass to the southeast of the mainly Lewisian islands of
203: 946:"Relationships between the Loch Ailsh and Borralan alkaline intrusions and thrusting in the Moine Thrust zone, southern Assynt culmination, NW Scotland" 39:
has been pushed along the thrust fault and now lies above younger well-bedded Cambrian quartzite, which itself lies unconformably above Lewisian gneiss
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The Ben More Thrust is the largest and most continuous of the thrust faults developed between the Moine and Sole Thrusts within the Assynt Window.
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results suggest that this is unlikely to be the case. The link between the structures imaged offshore and those onshore remains unclear.
125: 1081: 556: 523:, although no thrusts are actually exposed. It is presumed to be truncated by the Great Glen Fault zone somewhere southwest of Mull. 737:"Structure and internal deformation of the Arnaboll Thrust Sheet, NW Scotland: implications for strain localization in thrust belts" 555:
In respect of it being 'the classic orogenic front of significant importance in both modern and historical tectonics research', the
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When the MOIST (Moine and Outer Isles Seismic Traverse) deep seismic profile was acquired north of the Scottish mainland by the
692:"Tectonic stratigraphy and structural continuity of the northernmost Moine Thrust Zone and Moine Nappe, Scottish Caledonides" 668: 246:
The stratigraphic sequence of the footwall of the Moine Thrust is the full sequence characteristic of the Hebridean Terrane.
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In November that year Peach and Horne's preliminary results were published and Geikie published a paper in the same issue of
214:. The Moine Thrust Belt defines the boundary between the Hebridean Terrane to its northwest and the Northern Highlands 1070: 1034: 957: 785: 748: 711: 611: 1007: 811:"The Tarskavaig Nappe of Skye, northwest Scotland: a re-examination of the fabrics and their kinematic significance" 630:
The geological structure of the North-West Highlands of Scotland (with petrological chapters and notes by JJH Teall)
356:, in the central section of the thrust belt. Neoproterozoic Morar Group schists are thrust over Cambrian–Ordovician 653:
Mendum, J.R.; Barber A.J.; Butler R.W.H.; Flinn D.; Goodenough K.M.; Krabbendam M.; Park R.G; Stewart A.D. (2008).
348: 766:"Structural evolution of the Achnashellach Culmination, southern Moine Thrust Belt: testing the duplex model" 35:
The Glencoul Thrust, part of the Moine Thrust Belt, dipping downwards from left to right, where Precambrian
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the Kishorn thrust sheet is eroded to form the Ord window in which the foreland rocks once more appear.
973: 140: 79:, the belt marks a change from rugged, terraced mountains with steep sides sculptured from weathered 234: 1120: 643:
British Geological Survey 1996 Tectonic map of Britain, Ireland & adjacent areas, Pharoah et al
161:). The recognition of the Moine Thrust Belt in the early 1880s was a milestone in the history of 121: 1140: 434:
The Kinlochewe Thrust branches off the Moine Thrust's central section and runs southwards past
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of the Northern Highlands Terrane, in both the footwall and hanging wall of the Moine Thrust.
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on the north coast 190 kilometres (120 mi) southwest to the Sleat peninsula on the
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the Wester Keolka Shear was proposed to represent the Moine Thrust, although more recent
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of deformed rocks from the footwall or hanging-wall of the thrusts. The intrusions near
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age in the Northwest Highlands had been known since the early 19th century, convincing
56: 1066: 953: 952:. Geological Society, London, Special Publications. Vol. 335. pp. 383–404. 904: 889: 858:"Deep seismic reflection structure of the Caledonian orogenic front west of Shetland" 842: 810: 795: 781: 744: 743:. Special Publications. Vol. 335. London: Geological Society. pp. 321–333. 721: 707: 698:. Special Publications. Vol. 272. London: Geological Society. pp. 121–142. 691: 664: 607: 606:. Geological Society, London, Special Publications. Vol. 335. pp. 505–542. 211: 772:. Special Publications Geological Society, London. Vol. 272. pp. 103–120. 739:. In Law R.D.; Butler R.W.H.; Holdsworth R.E.; Krabbendam M.; Strachan R.A. (eds.). 602:. In Law R.D.; Butler R.W.H.; Holdsworth R.E.; Krabbendam M.; Strachan R.A. (eds.). 924: 877: 830: 773: 699: 471: 263: 255: 230: 187: 153: 129: 117: 88: 84: 36: 945: 777: 736: 703: 450:, where it is truncated by the Strathcarron Fault. It continues southwestwards to 459: 426:
This thrust is developed within the lower part of the belt in the Assynt Window.
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to estimate what the geology of Scotland was like before the Caledonian Orogeny.
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of the Sole Thrust changes from Lewisian in the south to Cambrian in the north.
633:. Memoirs of the Geological Survey of Great Britain. British Geological Survey. 627:
Peach B. N.; Horne J.; Gunn W.; Clough C. T.; Hinxman L.; Teall J.J.H. (1907).
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At the southwestern end of the Sleat peninsula, the Tarskavaig Thrust carries
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The Kishorn Thrust extends from the Achnashellach Culmination, just north of
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metasediments over the Sleat Group of the underlying Kishorn thrust sheet.
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Continental Tectonics and Mountain Building: The Legacy of Peach and Horne
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Continental Tectonics and Mountain Building: The Legacy of Peach and Horne
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Continental Tectonics and Mountain Building: The Legacy of Peach and Horne
943: 573: 447: 267: 133: 24: 929: 366: 202:. It is the most westerly Scandian structure in Scotland apart from the 1012:. British Regional Geology. Edinburgh: Her Majesty's Stationery Office. 540: 435: 223: 148: 76: 19: 689: 626: 948:. In Law R.D.; Butler R.W.H.; Holdsworth R.E.; Krabbendam M. (eds.). 763: 654: 305: 195: 144: 109: 52: 108:
lying apparently stratigraphically above sedimentary rocks of lower
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The Cambrian to lower Ordovician rocks consist of two groups, the
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The Geological Structure of the North-West Highlands of Scotland
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Deformation of the Continental Crust: The Legacy of Mike Coward
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Deformation of the Continental Crust: The Legacy of Mike Coward
219: 105: 101: 128:. A tectonic interpretation was supported by, amongst others, 734: 512: 483: 376: 903:
Walker S.; Thirwall M.F.; Strachan R.A.; Bird A.F. (2016).
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window and the Glen Achall imbricated thrust system, allow
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Goodenough, Kathryn (2006), "Geological Foundations", in
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Searle M.P.; Law R.D.; Dewey J.F.; Streule M.J. (2010).
855: 849: 663:. Joint Nature Conservation Committee. pp. 3–20. 410:
and also where Geikie coined the term "thrust plane".
802: 768:. In Ries A.C.; Butler R.W.H.; Graham R.H. (eds.). 694:. In Ries A.C.; Butler R.W.H.; Graham R.H. (eds.). 690:Holdsworth R.E.; Alsop G.I.; Strachan R.A. (2007). 683: 23:Moine Thrust belt defining the western edge of the 808: 764:Butler R.W.H.; Matthews S.J.; Morgan R.K. (2007). 656:Lewisian, Torridonian and Moine Rocks of Scotland 258:consists of mainly granitic gneisses that are of 1112: 937: 896: 550: 974:"The First 100 IUGS Geological Heritage Sites" 190:phase Caledonian Orogeny cycle as part of the 502: 981:IUGS International Commission on Geoheritage 543:have similar chemistry, both being forms of 186:The Moine Thrust Belt was formed during the 1052: 1032: 1016: 620: 597: 557:International Union of Geological Sciences 233:zone. This major sinistral (left-lateral) 67:. The thrust belt consists of a series of 1005: 928: 591: 477: 336:, lying tectonically beneath the younger 1136:First 100 IUGS Geological Heritage Sites 735:Wibberley C.A.J.; Butler R.W.H. (2010). 646: 515:. It is often shown passing through the 406:described the highly deformed rock type 365: 347: 266:age. They form the basement to both the 30: 18: 175: 1113: 375:thrust beneath it, although the term " 370:Cross-section over the Glencoul Thrust 241: 343: 465: 454:, becoming the basal thrust. On the 429: 136:on similar structures in the Alps. 856:McBride J.H.; England R.W. (1994). 290: 249: 13: 1037:. Leeds University. Archived from 999: 659:. Geological Conservation Review, 421: 413: 400: 14: 1152: 1065:, Scottish Mountaineering Trust, 909:Journal of the Geological Society 862:Journal of the Geological Society 600:"Mylonites: lessons from Eriboll" 441: 317:, with some limestone and chert. 1009:Scotland: The Northern Highlands 210:, which is developed within the 966: 382: 16:Fault in Highland, Scotland, UK 757: 637: 391: 323: 281: 1: 809:Law R.D.; Potts G.J. (1987). 778:10.1144/GSL.SP.2007.272.01.07 704:10.1144/GSL.SP.2007.272.01.08 584: 551:IUGS geological heritage site 100:The presence of metamorphic 95: 7: 562: 332:unit of the Neoproterozoic 10: 1157: 503:Southwestward continuation 179: 132:who had corresponded with 835:10.1017/S0016756800016265 526: 238:orogenic belt difficult. 882:10.1144/gsjgs.151.1.0009 1019:"The Moine Thrust Belt" 1006:Phemister, J. (1960). 478:Northward continuation 371: 363: 272:Wester Ross Supergroup 159:Wester Ross Supergroup 40: 28: 369: 351: 172:, published in 1907. 139:In 1883 and 1884 the 126:Highlands Controversy 34: 22: 352:The Moine Thrust at 338:Loch Ness Supergroup 330:tectonostratigraphic 276:Loch Ness Supergroup 176:Caledonian structure 71:that branch off the 1131:Geology of Scotland 1093: /  1033:Rob Butler (2002). 1017:Rob Butler (2000). 930:10.1144/jgs2015-034 921:2016JGSoc.173..489W 874:1994JGSoc.151....9M 827:1987GeoM..124..231L 815:Geological Magazine 598:White S.H. (2010). 579:Geology of Scotland 242:Involved rock units 1126:Structural geology 1035:"Assynt's Geology" 1021:. Leeds University 533:radiometric dating 497:radiometric dating 372: 364: 344:Individual thrusts 182:Caledonian Orogeny 114:Roderick Murchison 57:Scottish Highlands 41: 29: 670:978-1-86107-566-6 466:Tarskavaig Thrust 430:Kinlochewe Thrust 235:strike-slip fault 212:Hebridean Terrane 204:Outer Isles Fault 188:Scandian orogenic 49:Moine Thrust Zone 45:Moine Thrust Belt 1148: 1108: 1107: 1105: 1104: 1103: 1098: 1097:58.133°N 4.850°W 1094: 1091: 1090: 1089: 1086: 1075: 1063:Hostile Habitats 1049: 1047: 1046: 1029: 1027: 1026: 1013: 993: 992: 990: 988: 978: 970: 964: 963: 941: 935: 934: 932: 900: 894: 893: 853: 847: 846: 806: 800: 799: 761: 755: 754: 732: 726: 725: 687: 681: 680: 678: 677: 650: 644: 641: 635: 634: 624: 618: 617: 595: 472:Tarskavaig Group 379:" is also used. 291:Lower Palaeozoic 264:Paleoproterozoic 256:Lewisian complex 250:Lewisian complex 231:Great Glen Fault 130:Charles Lapworth 118:Archibald Geikie 59:which runs from 1156: 1155: 1151: 1150: 1149: 1147: 1146: 1145: 1121:Plate tectonics 1111: 1110: 1101: 1099: 1095: 1092: 1087: 1084: 1082: 1080: 1079: 1073: 1059:Wrightham, Mark 1044: 1042: 1024: 1022: 1002: 1000:Further reading 997: 996: 986: 984: 976: 972: 971: 967: 960: 942: 938: 901: 897: 854: 850: 807: 803: 788: 762: 758: 751: 733: 729: 714: 688: 684: 675: 673: 671: 651: 647: 642: 638: 625: 621: 614: 596: 592: 587: 565: 553: 529: 505: 480: 468: 460:Sleat peninsula 444: 432: 424: 422:Glencoul Thrust 416: 414:Ben More Thrust 403: 401:Arnaboll Thrust 394: 385: 346: 326: 293: 284: 252: 244: 184: 178: 98: 77:Topographically 55:feature in the 37:Lewisian gneiss 17: 12: 11: 5: 1154: 1144: 1143: 1138: 1133: 1128: 1123: 1102:58.133; -4.850 1077: 1076: 1071: 1050: 1030: 1014: 1001: 998: 995: 994: 965: 958: 936: 915:(3): 489–503. 895: 848: 821:(3): 231–248. 801: 786: 756: 749: 727: 712: 682: 669: 645: 636: 619: 612: 589: 588: 586: 583: 582: 581: 576: 571: 564: 561: 552: 549: 528: 525: 504: 501: 479: 476: 467: 464: 443: 442:Kishorn Thrust 440: 431: 428: 423: 420: 415: 412: 402: 399: 393: 390: 384: 381: 345: 342: 325: 322: 297:Ardvreck Group 292: 289: 283: 280: 251: 248: 243: 240: 208:Outer Hebrides 180:Main article: 177: 174: 97: 94: 15: 9: 6: 4: 3: 2: 1153: 1142: 1141:Thrust faults 1139: 1137: 1134: 1132: 1129: 1127: 1124: 1122: 1119: 1118: 1116: 1109: 1106: 1074: 1072:0-907521-93-2 1068: 1064: 1060: 1056: 1051: 1041:on 2007-02-20 1040: 1036: 1031: 1020: 1015: 1011: 1010: 1004: 1003: 982: 975: 969: 961: 959:9781862393004 955: 951: 947: 940: 931: 926: 922: 918: 914: 910: 906: 899: 891: 887: 883: 879: 875: 871: 867: 863: 859: 852: 844: 840: 836: 832: 828: 824: 820: 816: 812: 805: 797: 793: 789: 787:9781862392151 783: 779: 775: 771: 767: 760: 752: 750:9781862393004 746: 742: 738: 731: 723: 719: 715: 713:9781862392151 709: 705: 701: 697: 693: 686: 672: 666: 662: 658: 657: 649: 640: 632: 631: 623: 615: 613:9781862393004 609: 605: 601: 594: 590: 580: 577: 575: 572: 570: 567: 566: 560: 558: 548: 546: 542: 538: 537:Loch Borralan 534: 524: 522: 518: 517:Sound of Iona 514: 510: 500: 498: 494: 489: 485: 475: 473: 463: 461: 457: 453: 449: 439: 437: 427: 419: 411: 409: 398: 389: 380: 378: 368: 362: 359: 358:Durness Group 355: 350: 341: 339: 335: 334:metasediments 331: 321: 318: 316: 311: 310:trace fossils 308: 307: 302: 301:Durness Group 298: 288: 279: 277: 273: 269: 265: 261: 257: 247: 239: 236: 232: 227: 225: 221: 217: 213: 209: 205: 201: 197: 193: 189: 183: 173: 171: 170: 164: 160: 155: 150: 146: 142: 137: 135: 131: 127: 123: 119: 115: 111: 107: 103: 93: 90: 86: 82: 78: 74: 70: 69:thrust faults 66: 62: 58: 54: 50: 46: 38: 33: 26: 21: 1078: 1062: 1043:. 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Index


Morar Group

Lewisian gneiss
tectonic
Scottish Highlands
Loch Eriboll
Isle of Skye
thrust faults
Topographically
igneous
sedimentary
metamorphic
gneisses
schists
Paleozoic
Roderick Murchison
Archibald Geikie
James Nicol
Highlands Controversy
Charles Lapworth
Albert Heim
survey
Ben Peach
John Horne
Nature
Wester Ross Supergroup
geology
The Geological Structure of the North-West Highlands of Scotland
Caledonian Orogeny

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