Definition - What does Permian Period mean?
Permian Period is one of the geologic periods that lasted 299 to 251 million years ago. Permian period is also one of the last periods of Paleozoic Era, succeeding the Carboniferous and preceding the Triassic of the Mesozoic. The Permian era concept was introduced in 1841 by geologist Sir Roderick Murchison, who named it after the ancient kingdom of Permian.
Petropedia explains Permian Period
The global geography of the Permian period included massive areas of land and water. In the beginning of the Permian, the motion of the Earth's crustal plates had brought much of the total land together, fused in a supercontinent known as Pangea. Many of the continents of today in somewhat intact form met in Pangea (only Asia was broken up at the time), which stretched from the northern to the southern pole. Most of the rest of the surface area of the Earth was occupied by a corresponding single ocean, known as Panthalassa, with a smaller sea to the east of Pangea known as Tethys.
Models indicate that the interior regions of this vast continent were probably dry, with great seasonal fluctuations due to the lack of a moderating effect provided by nearby bodies of water. Only portions of this interior region received rainfall throughout the year. There are indications that the climate of the Earth shifted during the Permian, with decreasing glaciations as the interiors of continents became drier.