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the structure, indicating that the channel formed after the impact had occurred. This
Principle of Cross-Cutting Relationships, usually attributed to the 19th century geologist Charles Lyell, is a basic logic tool used by geologists to build relative sequence and history of events when investigating a region.
246:
Originally called
Tindouf, the 3.5-kilometer wide crater has been heavily eroded since its formation; however, its circular morphology is highlighted by exposures of older sedimentary rock layers that form roughly northwest to southeast-trending ridgelines. From the vantage point of an astronaut on
250:
A geologist interpreting this image to build a geological history of the region would conclude that the
Ouarkziz crater is younger than the sedimentary rocks, as the rock layers had to be already present for the meteor to hit them. Likewise, a stream channel is visible cutting across the center of
242:
The
Ouarkziz Impact Crater is located in northwestern Algeria, close to the border with Morocco. The crater was formed by a meteor impact less than 70 million years ago, during the late Cretaceous Period of the Mesozoic Era.
329:
Fabre, J., Kazi-Tani, N. and
Megartsi,M., The "circle" of Ouarkziz (northwestern Sahara), an astrobleme? (in French). Comptes Rendus, Academie des Sciences, Paris, v. 270, serie D, pp. 1212–1215. 1970
335:
Lambert, P., McHone, J.F. Jr., Dietz, R.S., Briedj, M. and
Djender,M., Impact and impact-like structures in Algeria. Part II, multi-ringed structures. Meteoritics, v. 16, pp. 203–227. 1981
385:
332:
Koeberl, C., African meteorite impact craters: Characteristics and geological importance. Journal of
African Sciences, v. 18, pp. 263–295. 1994
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image of
Ouarkziz crater draped over digital elevation model (x2 vertical exaggeration); screen capture from
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the
International Space Station, the impact crater is clearly visible with a magnifying camera lens.
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Planetary and Space
Science Centre University of New Brunswick Fredericton
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239:or younger). The crater is exposed at the surface.
33:image of the Ouarkziz crater; screen capture from
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188:Location of the crater in Algeria
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277:List of impact craters in Africa
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1086:Geography of Tindouf Province
917:Lunar and Planetary Institute
749:Cretaceous–Paleogene boundary
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1019:. You can help Knowledge by
962:. You can help Knowledge by
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809:Planar deformation features
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912:Impact Field Studies Group
1076:Cretaceous impact craters
1071:Impact craters of Algeria
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395:Impact cratering on Earth
348:at NASA Earth Observatory
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58:3.5 km (2.2 mi)
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882:William Kenneth Hartmann
548:Clearwater East and West
496:Confirmed≥20 km diameter
1096:Algeria geography stubs
799:Ordovician meteor event
42:Impact crater/structure
1081:Late Cretaceous Africa
950:This article about an
902:Eugene Merle Shoemaker
779:Late Heavy Bombardment
346:Ouarkziz Impact Crater
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1066:Earth Impact Database
923:Traces of Catastrophe
907:Earth Impact Database
855:Ralph Belknap Baldwin
302:Earth Impact Database
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132:29.01167°N 7.55222°W
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1091:Earth crater stubs
819:Shock metamorphism
724:Alvarez hypothesis
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137:29.01167; -7.55222
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1021:expanding it
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892:Graham Ryder
814:Shatter cone
804:Philippinite
653:Saint Martin
648:Rochechouart
553:Gosses Bluff
508:Amelia Creek
411:Impact event
310:. Retrieved
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688:Tookoonooka
673:Steen River
663:Siljan Ring
593:Manicouagan
578:Keurusselkä
135: /
110:Coordinates
1060:Categories
829:Stishovite
729:Australite
708:Yarrabubba
678:Strangways
638:Presqu'île
613:Montagnais
583:Lappajärvi
533:Charlevoix
518:Beaverhead
513:Araguainha
467:By country
437:Antarctica
312:2009-08-16
297:"Ouarkziz"
283:References
237:Cretaceous
47:Confidence
794:Moldavite
789:Meteorite
774:Impactite
703:Woodleigh
698:Vredefort
658:Shoemaker
618:Morokweng
603:Mistastin
543:Chicxulub
447:Australia
427:Worldwide
226:meteorite
120:29°0′42″N
68:<70 Ma
50:Confirmed
848:Research
693:Tunnunik
588:Logancha
558:Haughton
528:Carswell
472:Possible
255:See also
214:Ouarkziz
202:Oblique
123:7°33′8″W
99:Location
94:Location
55:Diameter
839:Tektite
834:Suevite
739:Coesite
734:Breccia
683:Sudbury
633:Popigai
628:Obolon'
608:Mjølnir
573:Karakul
563:Kamensk
523:Boltysh
503:Acraman
358:by NASA
233:Algeria
224:) is a
222:أوركزيز
204:Landsat
152:Algeria
148:Country
86:Drilled
78:Exposed
31:Landsat
717:Topics
598:Manson
452:Europe
432:Africa
218:Arabic
103:Sahara
1015:is a
958:is a
956:Earth
420:Lists
158:State
1017:stub
960:stub
568:Kara
70:<
954:on
231:in
81:Yes
64:Age
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89:No
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216:(
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