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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 first mammals evolved toward the end of the Triassic period from therapsids , the line of "mammal-like reptiles" that arose in the early Permian period and ...
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
For a good portion of the Permian period, the temnospondyl amphibians were the top predators of the earth's land masses. That all changed with the evolution of ...
http://dinosaurs.about.com/od/otherprehistoriclife/a/prehistoric-amphibians.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
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
Periods of the Paleozoic Era - Evolution - About.com
The first period in the Paleozoic Era is known as the Cambrian Period. .... Finally, in the Permian Period, all of the continents on Earth came together completely ...
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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