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Prehistoric Life During the Permian Period - Dinosaurs - About.com
The Permian period is when the first reptiles dominated the planet--not dinosaurs , but therapsids, also known as "mammal-like reptiles." Here's a look at the ...
http://dinosaurs.about.com/od/PaleozoicEra/a/Permian-Period.htm
The Permian-Triassic Extinction Event - Dinosaurs - About.com
About 250 million years ago, at the end of the Permian period, over 90 percent of the earth's marine organisms went extinct, along with nearly three-quarters of ...
http://dinosaurs.about.com/od/dinosaurextinction/a/The-Permian-Triassic-Extinction-Event.htm
The First Mammals (Triassic, Jurassic, and Cretaceous) - Dinosaurs
The Early Mammals of the Triassic, Jurassic and Cretaceous Periods ... the line of "mammal-like reptiles" that arose in the early Permian period and produced ...
http://dinosaurs.about.com/od/otherprehistoriclife/a/earlymammals.htm
The Great Permian-Triassic Extinction - Geology - About.com
The greatest mass extinction of the last 500 million years or Phanerozoic Eon happened 250 million years ago, ending the Permian Period and beginning the ...
http://geology.about.com/od/extinction/a/aa_permotrias.htm
Amphibian Evolution - The Story of Prehistoric Amphibians - Dinosaurs
As a general (though not very scientific) rule, the amphibians of the Carboniferous and Permian periods can be divided into two camps: small and weird-looking ...
http://dinosaurs.about.com/od/otherprehistoriclife/a/prehistoric-amphibians.htm
Before the Dinosaurs - Pelycosaurs, Archosaurs and Therapsids
The timing and sequence can't be pinned down precisely, but paleontologists believe that, some time during the early Permian period, a branch of pelycosaurs  ...
http://dinosaurs.about.com/od/otherprehistoriclife/a/beforedinos_2.htm
Prehistoric Life During the Carboniferous Period
The Carboniferous period marks the time when reptiles and amphibians cemented their ... Silurian and Devonian periods and succeeded by the Permian period.
http://dinosaurs.about.com/od/PaleozoicEra/a/Carboniferous-Period.htm
Prehistoric Life During the Triassic Period - Dinosaurs - About.com
At the start of the Triassic period, 250 million years ago, the earth was just recovering from the Permian/Triassic Extinction, which witnessed the demise of over ...
http://dinosaurs.about.com/od/dinosaurbasics/a/dinosaurages_2.htm
Periods of the Paleozoic Era - Evolution - About.com
Finally, in the Permian Period, all of the continents on Earth came together completely to form the supercontinent known as Pangaea. During the early parts of ...
http://evolution.about.com/od/LifeOrigins/tp/Periods-of-the-Paleozoic-Era.htm
Paleozoic Era - Evolution - About.com
This relatively quick period of evolution and species development established many new and ... The final period of the Paleozoic Era is the Permian Period.
http://evolution.about.com/od/LifeOrigins/a/Paleozoic-Era.htm
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