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Triangulated
Triangulating
triangulation
triangulation station
Triangulum
Triangulum Australe
Trianon
Trianthema monogymnum
Triarchies
triarchy
Triarian
Triarticulate
Trias
Triassic
triathlete
triathlon
Triatic
Triatic stay
Triatoma
triatomic
Triavil
triaxial
triaxiality
triazine
triazolam
trib

Triassic period definitions

WordNet (r) 3.0 (2005)

n
1: from 230 million to 190 million years ago; dinosaurs, marine reptiles; volcanic activity [syn: Triassic, Triassic period]

Britannica Concise

Interval of geologic time, c.245-208 million years ago, that marks the beginning of the Mesozoic era. Many new vertebrates emerged during the Triassic, heralding the major changes that were to occur in both terrestrial and marine life forms during the Mesozoic era. The seas became inhabited by large marine reptiles. On land, ancestral forms of various modern amphibians arose, as did reptiles such as turtles and crocodilians. By the Late Triassic, archosaurs were becoming more and more dominant, and the first true mammals, small shrewlike omnivores, evolved. Seed ferns dominated the flora of S Gondwana, and gymnosperms incl. conifers, cycads, and ginkgos were common throughout much of Pangaea.




 


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