Stratigraphic evidence for the Siberia-Laurentia connection and Early Cambrian rifting: comments and reply

Article Abstract:

S.M. Pelachaty had concluded that the geographic location of Siberia with respect to the Neoproterozoic supercontinent is poorly constrained. However, some of his proof in support of an Early Cambrian separation of Siberia from Laurentia is inaccurate and there is better evidence for Neoproterozoic rifting. If Siberia and Laurentia were juxtaposed, then 723 Ma intrusions should be found in the Anabar Shield and adjacent Proterozoic belts. None were found in this region.

Siberia, Cambrian period, Rifts (Geology), Laurasia (Geology), Laurasia

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Influence of changes in climate, sea level, and depositional systems on the fossil record of the Neoproterozoic-Early Cambrian metazoan radiation, Australia

Article Abstract:

Fossil preservation on the Australian continent is dependent on the distribution and juxtaposition of facies. Studies of the fossil record of higher metazoans show that the distribution of key habitats account for limitations in the fossil record, in turn influenced by climate and sea level changes and siliciclastic sediment supply. Such artifactual bias in Australia represents a major problem in the accurate reconstruction ofmetazoan evolution.

Metazoa, Metazoans, Proterozoic Eon, Geodes, Paleontology, Stratigraphic, Stratigraphic paleontology, Fossilization

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Simultaneous changes in carbon isotopes, sea level, and conodont biozones within the Cambrian-Ordovician boundary interval at Black Mountain, Australia

Article Abstract:

Carbon cycles and sea level changes affected conodont evolution. Carbon and Oxygen isotope and marine carbonate data from the Black Mountains of Australia indicate that primary secular variations in delta(super)C occured in the Georgina basin and are correlated with conodont biozone boundaries. Such findings support the link between carbon isotope cycles, eustatic sea level changes and episodes of mass extinction.

Paleozoic Era, Conodonts, Carbon cycle (Biogeochemistry), Carbon cycle, Paleobiology

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