Permian(redirected from Permians)
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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
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.