The Upper Triassic is the last epoch in the Triassic period. It began 237 million years ago, and ended 201.3 million years ago. It came after the Middle Triassic epoch, and came before the Lower Jurassic epoch.
The other two epochs of the Triassic were the Lower Triassic epoch and the Middle Triassic epoch.
Many early dinosaur species appeared for the first time during the Upper Triassic, including Plateosaurus, Coelophysis, and Eoraptor. Pterosaurs were common in the air, and Ichthyosaurs dominated the seas.
At the end of the Upper Triassic some event or events caused the extinction of many animal species worldwide. Known as the end–Triassic extinction event, it was similar to the more famous event that lead to the extinction of the dinosaurs, except no one knows for sure what caused the event. There are many theories as to what caused the event such as meteorite impact, tsunamis, or coronal mass ejections from the sun.
Carnian pluvial event[change | change source]
Although the Triassic period was, in general, a dry period with inland areas (often deserts), the Upper Triassic epoch saw a big change.
The Carnian Pluvial Event (CPE) was a major global climate change and biotic turnover (many extinctions) early in the Upper Triassic, about 230 million years ago. Shifts in carbon and oxygen isotopes suggest a global warming.
Major changes in organisms responsible for calcium carbonate production occurred during the CPE. Carbonate sedimentation stopped in deep water settings of Southern Italy. High extinction rates occurred among ammonoids, conodonts, bryozoa and crinoids. Major evolutionary innovations followed the CPE, as the first occurrence of dinosaurs, calcareous nannofossils and scleractinian corals.
References[change | change source]
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- Dal Corso J.; et al. (2012). "Discovery of a major negative δ13C spike in the Carnian (Late Triassic) linked to the eruption of Wrangellia flood basalts". Geology. 40 (1): 79–82.
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- Rigo M.; et al. (200). "A rise in the Carbonate Compensation Depth of western Tethys in the Carnian: deep-water evidence for the Carnian Pluvial Event". Palaeogeography, Palaeoclimatology, Palaeoecology. 246: 188–205.