Research topic:dinosaur

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dinosaurs

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

dinosaurs Literally the name means ‘terrible lizards’, but in fact the dinosaurs were not lizards. They were diapsid reptiles whose closest living relatives are the crocodilians and birds. Dinosaurs first appeared in the Middle Jurassic and produced an astonishing array of different types and sizes before becoming extinct at the end of the Cretaceous. The two groups of dinosaurs, Saurischia and Ornithischia, are not usually thought to be more closely related to each other than to other archosaurs, so the concept of ‘dinosaur’ is a heterogeneous one.

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AILSA ALLABY and MICHAEL ALLABY. "dinosaurs." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 Nov. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "dinosaurs." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (November 27, 2009). http://www.encyclopedia.com/doc/1O13-dinosaurs.html

AILSA ALLABY and MICHAEL ALLABY. "dinosaurs." A Dictionary of Earth Sciences. 1999. Retrieved November 27, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-dinosaurs.html

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