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Prehistoric Life During the Devonian Period - Dinosaurs - About.com
From a human perspective, the Devonian period was a crucial time for the evolution of life: this was when the first vertebrate tetrapods climbed out of the ...
http://dinosaurs.about.com/od/PaleozoicEra/a/Devonian-Period.htm
Prehistoric Sharks and Shark Evolution - Dinosaurs - About.com
Prehistoric sharks really came into their own during the middle Cretaceous period, about 100 million years ago. Both Cretoxyrhina (about 25 feet long) and ...
http://dinosaurs.about.com/od/otherprehistoriclife/a/prehistoric-sharks.htm
Fish Evolution - The Story of Prehistoric Fish - Dinosaurs - About.com
During the Ordovician and Silurian periods--from 490 to 410 million years ago-- the ... By the start of the Devonian period--about 420 million years ago--the ...
http://dinosaurs.about.com/od/otherprehistoriclife/a/prehistoric-fish.htm
Devonian Period - Paleozoic Era - Timeline of Biological History
The Devonian Period (408-360 Myr BP) is the fourth of six periods that make up the Paleozoic Era. It is preceeded by the Silurian Period and followed by the ...
http://animals.about.com/od/d/g/devonianperiod.htm
The Story of Tetrapod Evolution - Dinosaurs - About.com
What's more, the lobe-finned fishes of the Devonian period were already able to breathe air, when necessary, via "spiracles" in their skulls. (Today, the only ...
http://dinosaurs.about.com/od/otherprehistoriclife/a/tetrapods.htm
Prehistoric Life During the Carboniferous Period
The global climate of the Carboniferous period was intimately linked with its geography. During the course of the preceding Devonian period, the northern ...
http://dinosaurs.about.com/od/PaleozoicEra/a/Carboniferous-Period.htm
Prehistoric Life During the Silurian Period - Dinosaurs - About.com
The shortest period of the Paleozic Era, the Silurian marks the time when the first ... was ancestral to the pioneering tetrapods of the ensuing Devonian period.
http://dinosaurs.about.com/od/PaleozoicEra/a/Silurian-Period.htm
Acanthostega - About.com Tetrapods - Dinosaurs
Rivers and swamps of the northern latitudes. Historical Period: Late Devonian ( 365 million years ago). Size and Weight: About 2 feet long and 5-10 pounds. Diet :.
http://dinosaurs.about.com/od/tetrapodsandamphibians/p/acanthostega.htm
Dunkleosteus - About.com Prehistoric Fish
The marine animals of the Devonian period--over 100 million years before the first dinosaurs--tended to be small and meek, but Dunkleosteus was a major ...
http://dinosaurs.about.com/od/tetrapodsandamphibians/p/dunkleosteus.htm
The Paleozoic Era - Dinosaurs - About.com
Stretching from 542 to 250 million years ago, the Paleozoic Era is when the first ... The Devonian period is when the first, brave lobe-finned fish climbed out of the ...
http://dinosaurs.about.com/od/PaleozoicEra/
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