Birgeria - AbsoluteAstronomy.com

Birgeria is an extinct genus of bony fish from the Triassic

Triassic

The Triassic is a geologic period and system that extends from about 250 to 200 Mya . As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic. Both the start and end of the Triassic are marked by major extinction events...

Sources

Fossils (Smithsonian Handbooks) by David Ward (Page 211)

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