Top: Science: Earth Sciences: Paleontology: Terminology: O

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Oligocene

An epoch of the early Tertiary period, spanning the time between 33.7 and 23.8 million years ago. It is named after the Greek words "oligos" (little, few) and "ceno" (new).


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Ordovician

The second earliest period of the Paleozoic era, spanning the time between 505 and 440 million years ago. It is named after a Celtic tribe called the Ordovices.


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Ostracoderms

Primitive jawless fishes, covered by bony armor, that lived in the Cambrian through Devonian periods. 



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