Triassic

E38909

chronostratigraphic unit epoch geologic period mass extinction

The Triassic was the first period of the Mesozoic Era, marked by the initial diversification of dinosaurs and the recovery of life following the Permian–Triassic mass extinction.

Jump to: Surface forms Statements Referenced by

Observed surface forms (6)

Surface form	Occurrences
Triassic Period	6
Early Triassic	1
Late Triassic	0
Middle Triassic	0
Triassic period	1
Triassic–Jurassic extinction event	0

Statements (50)

Predicate	Object
instanceOf	chronostratigraphic unit ⓘ epoch ⓘ epoch ⓘ epoch ⓘ geologic period ⓘ mass extinction ⓘ
associatedWith	World Ocean ⓘ surface form: Panthalassa Ocean Tethys Ocean ⓘ supercontinent Pangaea ⓘ
beginsAfter	Permian–Triassic mass extinction ⓘ
characterizedBy	appearance of first true mammals ⓘ diversification of ammonoids ⓘ diversification of marine reptiles ⓘ dominance of conifers ⓘ dominance of synapsid therapsids in early Triassic ⓘ evolution of early lissamphibians ⓘ evolution of early turtles ⓘ evolution of first flying vertebrates pterosaurs ⓘ expansion of gymnosperm forests ⓘ initial diversification of dinosaurs ⓘ low diversity but high abundance of some disaster taxa in Early Triassic ⓘ monsoonal climate patterns on Pangaea margins ⓘ origin of modern-style coral reefs ⓘ presence of ichthyosaurs ⓘ presence of sauropterygians such as plesiosaurs ancestors ⓘ presence of seed ferns ⓘ radiation of archosaurs ⓘ recovery of coral reef ecosystems by Middle to Late Triassic ⓘ recovery of marine ecosystems ⓘ recovery of terrestrial ecosystems ⓘ rise of crocodile-line archosaurs ⓘ widespread arid continental climates ⓘ
duration	about 51 million years ⓘ
end	approximately 201 million years ago ⓘ
endsWith	Triassic–Jurassic extinction event ⓘ
follows	Permian ⓘ
GSSP	Kuhjoch section Austria for base of Jurassic and top of Triassic ⓘ Meishan section China for base of Triassic ⓘ
lowerBoundaryDefinedBy	first appearance of conodont Hindeodus parvus ⓘ
nameCoinedIn	1834 ⓘ
namedBy	Friedrich von Alberti ⓘ
nameRefersTo	threefold division of Germanic Trias red beds limestones and evaporites ⓘ
partOf	Mesozoic Era ⓘ
precedes	Jurassic ⓘ
recognizedBy	International Commission on Stratigraphy ⓘ
start	approximately 252 million years ago ⓘ
subdividedInto	Triassic self-linksurface differs ⓘ surface form: Early Triassic Late Triassic ⓘ Middle Triassic ⓘ
upperBoundaryDefinedBy	first appearance of ammonite Psiloceras spelae tirolicum ⓘ