prepermian

Permian

[pur-mee-uhn]
adjective
1.
Geology. noting or pertaining to a period of the Paleozoic Era occurring from about 280 to 230 million years ago and characterized by a profusion of amphibian species. See table under geologic time.
noun
2.
Geology. the Permian Period or System.

Origin:
1835–45; Perm + -ian

post-Permian, adjective
pre-Permian, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Permian (ˈpɜːmɪən)
 
adj
1.  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
 
n
2.  the Permian the Permian period or rock system
 
[C19: after Perm, Russia]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

Permian
1841, "pertaining to the uppermost strata of the Paleozoic era," named by British geologist Sir Roderick Impey Murchison (1792-1871) for the region of Perm in northwestern Russia, where rocks from this epoch are found.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
Permian   (pûr'mē-ən)  Pronunciation Key 
The seventh and last period of the Paleozoic Era, from about 286 to 245 million years ago. During the Permian Period the supercontinent Pangaea, comprising almost all of today's landmasses, formed. Gymnosperms evolved, the first modern conifers appeared, and reptiles diversified. The Permian Period ended with the largest known mass extinction in the history of life. It wiped out nearly 90 percent of known marine life forms. See Chart at geologic time.
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