-
The cambrian 570-500 MYA
Earliest record of Marine Life- Trilobites are dominant -
Ordovician 500M - 435M
Echinoderms (star fish, and sand dollar, sea urchin and sea cucumbers). Invertebrates, are dominant, mollusks become abundant. Earliest fish that are jawless and later, are jawed and armored. -
Silurian 435M- 395M
Earliest terrestrial plants and animals Eurypterids develop. -
Devonian 395M - 345M
Armored fish go extinct, but abundance of several species of fish earliest amphibians and ammonites. -
Carboniferous- 345M-280M
Abundant shark and amphibians, large swamps and coal , forming forest ( earliest reptiles). -
Permian - 280M- 225M
Extinction of many types of marine animals, including Trilobites. -
Triassic- 225M- 195M
Earliest Dinosaurs, abundant cycads and conifers. -
Jurassic- 195M- 136M
Earliest birds and mammals abundant dinosaurs and ammonites. -
Cretaceous - 136M- 65M
Earliest flowering plants.
