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From Wikipedia, the free encyclopedia

System Series Stage Age (Ma)
Jurassic Lower Hettangian younger
Triassic Upper Rhaetian 199.6–203.6
Norian 203.6–216.5
Carnian 216.5–228.0
Middle Ladinian 228.0–237.0
Anisian 237.0–245.0
Lower Olenekian 245.0–249.7
Induan 249.7–251.0
Permian Lopingian Changhsingian older
Subdivision of the Triassic system according to the IUGS, as of July 2009.

The Late Triassic is in the geologic timescale the third and final of three epochs of the Triassic period. The corresponding series is known as the Upper Triassic. In the past it was sometimes called the Keuper, after a German lithostratigraphic group (a sequence of rock strata) that has a roughly corresponding age. The Late Triassic spans the time between 228.0 ± 2 Ma and 199.6 ± 0.6 Ma (million years ago). The Late Triassic is divided into the Carnian, Norian and Rhaetian ages.

Many of the first dinosaurs evolved during the Late Triassic, including Plateosaurus, Coelophysis, and Eoraptor.

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Paleogeography and tectonics

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Africa

Africa shared Pangea's relatively uniform fauna which was dominated by theropods, prosauropods and primitive ornithischians by the close of the Triassic period.[1] Late Triassic fossils are found through-out Africa, but are more common in the south than north.[1] The boundary separating the Triassic and Jurassic marks the advent of an extinction event with global impact, although African strata from this time period have not been thoroughly studied.[1]

See also

Triassic period
Lower/Early Triassic Middle Triassic Upper/Late Triassic
Induan | Olenekian Anisian | Ladinian Carnian | Norian
Rhaetian

References

  1. ^ a b c Jacobs, Louis, L. (1997). "African Dinosaurs." Encyclopedia of Dinosaurs. Edited by Phillip J. Currie and Kevin Padian. Academic Press. p. 2-4.

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