Of, relating to, or being the period of geologic time from about 299 to 251 million years ago, the seventh and last period of the Paleozoic Era. The Permian Period is characterized by the formation of the supercontinent Pangaea, the first modern conifers, and the diversification of reptiles. It ended with the largest known mass extinction in the history of life.
The Permian Period.
Designating or of the sixth and last geologic period of the Paleozoic Era, characterized by the formation of Pangea, glaciation in the Southern Hemisphere, development of mountains, esp. in the Appalachians, and an increase in the diversity of land plants and animals.
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.
the Permian Period or its rocks
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Idioms and Phrasal Verbs
Origin of permian
AfterPerm Oblast, a region of west-central Russia
American Heritage Dictionary of the English Language, 5th Edition
Permian Sentence Examples
Both to the east and to the west of this depression the Archean and Palaeozoic rocks which form the greater part of the island are strongly folded, with the exception of the uppermost beds, which belong to the Permian system.
At Bajo de Velis, in San Luis, the plants belong to the " Glossopteris flora," which is so widely spread in South Africa, India and Australia, and the beds are correlated with the Karharbari series of India (Permian or Permo-Carboniferous).
The latter is, no doubt, identical with the similar sandstone series which is found in the neighbouring Brazilian province of Rio Grande do Sul, and which has there yielded plants which prove it to belong to the Permian or the upper part of the Carboniferous.
Russia, rich in salt-springs, but very poor in fossils, are now held by most Russian geologists to be Triassic. The Permian deposits contain marine shells and also remains of plants similar to those of England and Germany.
Some of the deposits appear to be of Permian age, but others are probably Jurassic; and they are all included under the general name of the Angara series.