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Cambrian 570M-500M
This is a major time period, this is when major groups of animals begin to appear on the fossil record. -
Ordocian 500M-435M
A period that lasted 45 million years. This is best known for its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts. -
Silurian 435M-395M
This when the growth of corals and other marine organisms was stoked by oceans teeming with tiny planktonic creatures. -
Carboniferous 345M-280M
The Carboniferous Period is popular for its vast swamp forests. Swamps made the coal from which the term Carboniferous, or carbon--bearing, is derived. -
Permian 280M-225M
A period, which ended in the biggest mass extinction the Earth has ever known, began about 299 million years ago. -
Devonian 395M-345M
The early Devonian consisted primarily of small plants, the tallest being only a meter tall. By the end of the Devonian ferns horsetails and seed plants had also appeared producing the first trees and the first forests.. -
Trarrasic 225M-195M
Earliest dinosours abaundant cycads, and conifers. -
Jurrasic 195M-136M
Earliest birds and mammals abundant and dinosours and amonities. -
Creataceous 136M-65M
Earliest flowing plants, climax of dinosours followed by thier exctintion great decline of brachiopod, abundance of bony fish -
Tertiary 65M-1.8M
Earliest placement mammals modern mammals large running mammals. -
Quaternary 1.8M-Present
Large Carnivores, Neanderthals,Humans,and Mastodons were all present during this time period.
