Triassic

The Triassic is the first geological period in the Mesozoic era and the seventh period of the Phanerozoic eon. It lasted 50.6 million years. The period began 251.9 million years ago, and ended 201.3 million years ago.^[1][2] Its start and finish were both notable extinction events.^[3]

The period before the Triassic was the Permian period, the last period in the Palaeozoic era. The Jurassic period came after the Triassic.^[1]

Many new groups arose during the Triassic period, including the first dinosaurs, the first mammals, the first pterodactyls, the first ichthyosaurs and the first plesiosaurs.^[4]

1. ↑ ^{1.0 1.1} Cohen, K.M.; Finney, S.; & Gibbard, P.L. (January 2013). "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. International Union of Geological Sciences. Retrieved June 12, 2016.{{cite web}}: CS1 maint: multiple names: authors list (link)
2. ↑ "ICS - Chart/Time Scale". www.stratigraphy.org.
3. ↑ Sahney S. & Benton M.J. 2008. Recovery from the most profound mass extinction of all time. Proceedings of the Royal Society B: Biological Sciences 275 (1636): 759–765. PMID [1]
4. ↑ Cite error: The named reference brit was used but no text was provided for refs named (see the help page).