Dating methods devonian new york shale Punjabisexchat com
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Though Laurussia was essentially tropical or subtropical, its climatic zones changed somewhat through the course of the Devonian as this landmass migrated northward during Late Devonian and Early Carboniferous times.
Evidence for this movement includes the reduction in evaporitic environments in western Canada and the onset of humid and moist conditions in the area of New York.
The oceans experienced episodes of reduced dissolved oxygen levels, which likely caused the extinction of many species, especially marine animals.
These extinctions were followed by periods of species diversification, as the descendants of surviving organisms filled in abandoned habitats.corals from Torquay in Devon seemed intermediate in type between those of the Silurian System below and those of the Lower Carboniferous System above.The correlations discussed demonstrate the utility of the gamma-ray log for regional, basinwide stratigraphic studies.