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Prehistoric Life During the Devonian Period - Dinosaurs - About.com
The Devonian period is when the first, brave lobe-finned fish climbed out of the sea and onto dry land, kicking off millions of years of terrestrial vertebrate ...
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
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
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
Fish Evolution - The Story of Prehistoric Fish - Dinosaurs - About.com
Perhaps because they were so slow and awkward, placoderms vanished by the end of the Devonian period, outclassed by two other newly evolved families of ...
http://dinosaurs.about.com/od/otherprehistoriclife/a/prehistoric-fish.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 plants and animals colonized dry land. Here's a ... Next: the Devonian Period ...
http://dinosaurs.about.com/od/PaleozoicEra/a/Silurian-Period.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
Paleozoic Era - Evolution - About.com
The following period, the Devonian Period, saw vertebrates join the other types of animals on land. The first ones to leave the water were similar to amphibians ...
http://evolution.about.com/od/LifeOrigins/a/Paleozoic-Era.htm
The Three Ages of Dinosaurs - The Triassic, Jurassic, and ...
What does it mean to say that a dinosaur lived in the Triassic, Jurassic, or Cretaceous period? Here's a description of these three stretches of the Mesozoic Era, ...
http://dinosaurs.about.com/od/dinosaurbasics/a/dinosaurages.htm
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