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The start of the Mesozoic era, 225-190 million years ago. It was the "Age of Reptiles": small dinosaurs, turtles and mammals arose. Pangaea began to split into Laurasia and Gondwanaland. Plants became complex.
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Tri*as"sic (?), a. Geol.
Of the age of, or pertaining to, the Trias.
n.
The Triassic formation.
© Webster 1913.
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