Timescale by Ross Elgin (2004)
|All dinosaurian groups except
for birds (Aves) went extinct at the end of the Cretaceous period,
65 million years ago. Dinosaur fossils
are found in Triassic, Jurassic, and Cretaceous sediments from
around the world on all continents, including Antarctica.
The dinosaurs were the main terrestrial fauna for over 150 million
years, and were only replaced by mammals after huge natural disasters
including an asteroid impact wiped them off the face of the Earth.
Author: Emma Schachner
Last updated: 13 November 2004
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