-
Cambrian period 570-500 mya
Earliest Record of Marine life- Trilobites are dominant -
Ordovician 500- 435 mya
MEchinoderms ( Starfish, Sand dollar , sea urchin and seacucumbers). Invertebrates are dominant, mollusks becomeabundant. Earliest Fish that are Jawless and later, jawed andarmored fish. -
Silurian 435 M- 395M
Earliest terrestrial plants and animals. Tiktaalik Eurypterids develop -
Devonian 395 M- 345M
Armored fish go extinct, but abundance of several species of fish.
Earliest amphibians and ammonites. -
Carboniferous 345M-280M (Mississippian, Pennsylvanian)
Abundant sharks and amphibians. Large swamps and coal forming
forests. Earliest reptiles. Scale trees and seed ferns -
Permian 280 M-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, climax of dinosaurs followed
by their extinction. Great decline of brachiopods.
Abundance of bony fish. -
Tertiary- 65 M- 1.8M
Earliest Placental Mammals, modern mammals,
large running mammals -
Quaternary- 1.8 M – Present
Large Carnivores, Neanderthals, Humans,
mastodons
