Triassic

The Triassic is a geologic period and system that extends from about 250 to 200 Ma (252.2 ± 0.5 to 201.3 ± 0.2 million years ago). It is the first period of the Mesozoic Era, and lies between the Permian and Jurassic periods. Both the start and end of the period are marked by major extinction events. The Triassic was named in 1834 by Friedrich Von Alberti, after the three distinct rock layers (tri meaning "three") that are found throughout Germany and northwestern Europe—red beds, capped by chalk, followed by black shales—called the 'Trias.'

The Triassic began in the wake of the Permian–Triassic extinction event, which left the Earth's biosphere impoverished; it would take well into the middle of the period for life to recover its former diversity. Therapsids and archosaurs were the chief terrestrial vertebrates during this time. A specialized subgroup of archosaurs, dinosaurs, first appeared in the mid-Triassic but did not become dominant until the succeeding Jurassic. The first true mammals also evolved during this period, as well as the first flying vertebrates, the pterosaurs. The vast supercontinent of Pangaea existed until the mid-Triassic, after which it began to gradually rift into two separate landmasses, Laurasia to the north and Gondwana to the south. The global climate during the Triassic was mostly hot and dry, with deserts spanning much of Pangaea's interior. However, the climate shifted and became more humid as Pangaea began to drift apart. The end of the period was marked by yet another major mass extinction, wiping out many groups and allowing dinosaurs to assume dominance in the Jurassic.

Read more about Triassic:  Dating and Subdivisions, Paleogeography, Climate, Life, Coal, Lagerstätten, Triassic-Jurassic Extinction Event

Other articles related to "triassic":

Triassic-Jurassic Extinction Event
... The Triassic period ended with a mass extinction, which was particularly severe in the oceans the conodonts disappeared, and all the marine reptiles except ... Though the end-Triassic extinction event was not equally devastating everywhere in terrestrial ecosystems, several important clades of crurotarsans (large ... What caused this Late Triassic extinction is not known with certainty ...
Geology Of The North Sea - Permo-Triassic Rifting and Thermal Subsidence
... The Mesozoic era consisted of the Triassic (251.0 Ma to 199.6 Ma) Jurassic (199.6 Ma to 145.5 Ma) and Cretaceous (145.5 Ma to 66 Ma) periods ... During the Triassic period, the Viking and Central Graben volcanic systems were formed ... thrusting rifts were formed during the Triassic comprising the taphrogenic stage ...
Therocephalia - Classification
... however, outlasted the gorgonopsids, persisting into the early-Middle Triassic period ... Therocephalians and cynodonts both survived the Permian-Triassic mass extinction, but while therocephalians soon went extinct, cynodonts underwent rapid diversification ... Most Triassic therocephalian lineages originated in the Late Permian, and lasted for only a short period of time in the Triassic ...
Claraia
... from the Capitanian stage of the Late Permian to the Anisian stage of the Middle Triassic, 266-237 million years ago ... These are common fossils subsequent to the Permian-Triassic boundary, suggesting that the genus experienced rapid diversification during and after the Permian–Triassic extinction event, around 251.4 ...
São Gabriel - Paleontology
... amphibians and reptiles whose ages range from the Permian to the Triassic have been found ... Age Late Permian and/or Early Triassic ... Age Late Triassic ...