Cretaceous | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-07

This is an audio version of the Wikipedia Article:
Cretaceous


00:01:17 1 Geology
00:01:26 1.1 Research history
00:01:58 1.2 Stratigraphic subdivisions
00:04:48 1.3 Rock formations
00:07:08 2 Paleogeography
00:09:17 3 Climate
00:11:58 4 Life
00:12:06 4.1 Flora
00:13:02 4.2 Terrestrial fauna
00:14:53 4.3 Marine fauna
00:15:58 4.4 End-Cretaceous extinction event
00:19:26 5 See also



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SUMMARY
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The Cretaceous ( , kri-TAY-shəs) is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 million years ago (mya) to the beginning of the Paleogene Period 66 mya.  It is the last period of the Mesozoic Era, and the longest period of the Phanerozoic Eon.  The Cretaceous Period is usually abbreviated K, for its German translation Kreide (chalk, creta in Latin).
The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites and rudists, while dinosaurs continued to dominate on land. During this time, new groups of mammals and birds, as well as flowering plants, appeared.
The Cretaceous (along with the Mesozoic) ended with the Cretaceous–Paleogene extinction event, a large mass extinction in which many groups, including non-avian dinosaurs, pterosaurs and large marine reptiles died out. The end of the Cretaceous is defined by the abrupt Cretaceous–Paleogene boundary (K–Pg boundary), a geologic signature associated with the mass extinction which lies between the Mesozoic and Cenozoic eras.