Triassic
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| See Triassic in Wikipedia, the free encyclopedia. |
The Triassic is the period of time from 251-206 million years ago. It is the first period of the Mesozoic Era. The Triassic started after an extinction called the Permian-Triassic, or "P/T" extinction event wich killed off 95% of life at the end of the Permian Period.
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[edit] Life and Evolution
Major events include the appearance of dinosaurs, crocodiles and mammals.
[edit] Geologic and Paleotectonic Environment
Geologically Pangaea remained intact, although an incipient split was beginning to occur along a spreading ridge extending from the Tethys Ocean along the old suture zone between the African and North American plates. The Cimmerian and Cathayasian orogenies were occurring as fragmented terrains (including: Turkey, Iran, Afghanistan, Tibet and Malaysia) were being accreted to the southern Eurasian plate. The Sonoman orogeny was occurring as terraines were accreting along the southwest North American plate. The Southern US was on the equator and central Greenland and Scandinavia were at about 30oN.
[edit] Additional Information
See also: Geological Timescale.
