Comment.(E. Duebendorfer and M. Rees')
Article Abstract:
A comment on E. Duebendorfer and M. Rees' article entitled 'Evidence for Cambrian deformation in the Ellsworth-Whitmore Mountains terrane, Artarctica: stratigraphic and tectonic implications' is presented. The comment focuses on the timing of structures and their development during Cambrian Ross age deformation and the characteristics of the boundary between the Heritage and Crashite groups. Based on detailed structural mapping, the basal Crashite Group reveals the stratigraphic effect of a tectonic occurrence and that there is no data on Cambrian contractional deformation.
Publication Name: Geology
Subject: Earth sciences
ISSN: 0091-7613
Year: 1998
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Carbon isotopic evidence for photosynthesis in Early Cambrian oceans: comment and reply
Article Abstract:
Cyanobacteria in reefs throughout the Cambrian showed evidence of photosynthesis, despite the low variability in carbon isotopic composition of the important reef-builder Epiphyton from Early Cambrian limestones in South Australia. The absence of a vital effect on carbon isotopic values does not lead to the conclusion that photosynthesis did not take place. Data indicate that photosynthetic cyanobacteria were important reef-builders throughout the Cambrian, in the same manner that photosynthetic algae are a major element in present-day reefs.
Publication Name: Geology
Subject: Earth sciences
ISSN: 0091-7613
Year: 1998
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Search for evidence of impact at the Permian-Triassic boundary in Antarctica and Australia: comment and reply
Article Abstract:
G.J. Retallack et al investigated events at the Permian-Triassic boundary by employing terrestrial successions from Australia and Antarctica. In placing the boundary at Mount Crean in southern Victoria Land, Antarctica, Retallack et al used criteria that are ambiguous and may be difficult to apply at any one location. Moreover, the boundary at Mount Crean is a not a paleobotanical boundary as asserted and cannot be identified using fossils. Therefore, the boundary in question needs further discussion and clarification.
Publication Name: Geology
Subject: Earth sciences
ISSN: 0091-7613
Year: 1999
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