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<onlyinclude>The '''Triassic''' was the first geological [[Geologic time scale|period]] of the [[Mesozoic]] era, extending from approximately 251.902 million to 201.3 million years ago.</onlyinclude> It is divided into Upper, Middle, and Lower [[Geologic epoch|epochs]] (Figure 1).<ref name=ICS>International Commission on Stratigraphy."International Chronostratigraphic Chart v2018" Accessed Nov.8, 2018 [Online]. Available: http://www.stratigraphy.org/index.php/ics-chart-timescale</ref> The name "Triassic" is derived from German geologist Frederich August von Alberti's ''Trias'' (1834), which united three [[rock]] formations: coloured sandstone (Figure 2), clam limestone, and non-marine red beds.<ref name=GTS>Gradstein, F. M. "The Geologic Time Scale 2012". Volume 2. 1st ed. Amsterdam ; Boston: Elsevier, 2012.</ref>

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File:ICS Triassic.jpg|Figure 1.ICS Triassic timeline.<ref name=ICS12>International Commission on Stratigraphy."International Chronostratigraphic Chart v2016" Accessed Nov.18, 2012 [Online]. Available: https://www.britannica.com/science/Tithonian-Stage</ref>
File:Stadtroda Sandstein.jpg|thumb|center|Figure 2. Triassic sandstone near Stadtroda, Germany.<ref>WikiMedia Commons. "File:Stadtroda Sandstein.jpg" Accessed Nov.18, 2018 [Online]. Available: https://en.wikipedia.org/wiki/File:Stadtroda_Sandstein.jpg</ref>
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The Triassic began and ended with major extinction events. The early Triassic saw plants and animals slowly recovering from the [[Permian]]-Triassic extinction event. The late Triassic saw the first true dinosaurs (Figure 3) dominating on land and marks the beginning of the "Age of Dinosaurs" (the Mesozoic era). Other animals also existed (Figure 4), including the first mammals (Figure 5) and flying vertebrates.<ref name=GTS/> Regional [[climate]]s and paleogeographic areas became more distinct, with deserts, grasslands, and different types of forests developing. Wetter regions produced [[coal]]-rich formations that exist today.<ref name=UCB>University of California, Museum of Paleontology."The Triassic Period" Accessed Nov.18, 2018 [Online]. Available: http://www.ucmp.berkeley.edu/mesozoic/triassic/triassic.php</ref> The Triassic ended with the Triassic-Jurassic extinction event, wiping out entire classes of marine species and many of the large amphibians that existed on land.<ref name=GTS/>

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File:Coelophysis size flipped.jpg|Figure 3. Coelophysis, one of the first dinosaurs.<ref>WikiMedia Commons. "File:Coelophysis size flipped.jpg" Accessed Nov.18, 2018 [Online]. Available: https://en.wikipedia.org/wiki/File:Coelophysis_size_flipped.jpg</ref>
File:Lystrosaurus BW.jpg|Figure 4. Lystrosaurus, a common land vertebrate.<ref>WikiMedia Commons. "File:Lystrosaurus BW.jpg" Accessed Nov.18, 2018 [Online]. Available: https://en.wikipedia.org/wiki/File:Lystrosaurus_BW.jpg</ref>
File:Cynognathus BW.jpg|thumb|Figure 5. Cynognathus was a mammal-like cynodont.<ref>WikiMedia Commons. "File:Cynognathus BW.jpg" Accessed Nov.18, 2018 [Online]. Available: https://en.wikipedia.org/wiki/File:Cynognathus_BW.jpg</ref>
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The Pangea [[supercontinent]] experienced a relatively hot and arid climate during this period. No evidence has been found of the [[glaciation]]s that routinely occurred in earlier [[Geologic period|periods]].<ref name=GTS/> By the Middle Triassic, Pangea began to drift apart, breaking into the continents of southern Gondwana and northern Laurasia. The breaking up of Pangea allowed for the drier inner areas of the landmass to experience more humidity.<ref name=UCB/> The breaking up Pangea and the resulting change in regional climates, combined with periodic volcanism that was occurring at the time, are thought to be contributing causes to the Triassic-Jurassic extinction event.<ref name=GTS/>

[[File:ChronostratChart2018-08.jpg|800px|thumb|center|Figure 6. The ICS Chronostratigraphic Chart<ref name=ICS/>]]

==For Further Reading==
*[[Geologic time scale]]
*[[Geologic period]]
*[[Mass extinction]]
*[[Supercontinent]]
*[[Stratigraphy]]
*Or explore a [[Special:Random|random page]]

==References==
{{reflist}}
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Triassic - Revision history

Jmdonev: 1 revision imported

2dev>Jmdonev at 02:34, 2 December 2018