Permian

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Permian

of, denoting, or formed in the last period of the Palaeozoic era, between the Carboniferous and Triassic periods, which lasted for 60 000 000 years
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Permian

[′pər·mē·ən]
(geology)
The last period of geologic time in the Paleozoic era, from 280 to 225 million years ago.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.