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GEOREF RECORD

Nature and extent of a late Ediacaran (Ca. 547 ma) glacigenic erosion surface in Southern Africa

G. J. B. Germs and C. Gaucher
Nature and extent of a late Ediacaran (Ca. 547 ma) glacigenic erosion surface in Southern Africa
South African Journal of Geology (March 2012) 115 (1): 91-102

Abstract

Erosional surfaces within the late Ediacaran upper Kuibis and lower Schwarzrand Subgroups of the Nama Group, that extend from the Klein Karas Mountains in Namibia eastward to the Namibian-South African border and from southern Namibia to Nigramoep (near Springbok) in South Africa, are interpreted to form one discontinuous regional unconformity termed the Vingerbreek Unconformity (VGU). This unconformity formed by glacial, proglacial and fluvial erosion. The palaeochannels (palaeovalleys) associated with this unconformity in southern Namibia and northwestern South Africa are interpreted to have formed distant from major glaciers as a result of predominantly glacio-eustatic sea level fall. Our findings are consistent with a late Ediacaran (ca 547 Ma) glaciation, that is also recorded in South America and Eurasia. The evolutionary implications of a glacial event just before the Ediacaran/Cambrian are considerable, because climate deterioration could have acted as an evolutionary bottleneck and thus promoted the Cambrian explosion in its aftermath.


ISSN: 1012-0750
EISSN: 1996-8590
Serial Title: South African Journal of Geology
Serial Volume: 115
Serial Issue: 1
Title: Nature and extent of a late Ediacaran (Ca. 547 ma) glacigenic erosion surface in Southern Africa
Affiliation: Private Bag X607, Oudtshoorn, South Africa
Pages: 91-102
Published: 201203
Text Language: English
Publisher: Bureau for Scientific Publications, Pretoria, South Africa
References: 44
Accession Number: 2012-035835
Categories: StratigraphyGeomorphology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
S30°00'00" - S28°00'00", E16°00'00" - E20°00'00"
Secondary Affiliation: Departamento de Geologia,
Country of Publication: South Africa
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, Geological Society of South Africa. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201219
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