-
Cambrian Period 570-500 MYA
earliest record of marine life
Trilobites are dominant -
Period: to
Paleozoic Period
Old Life -
Ordovician Period 500-435MYA
Echinoderms( starfish, sand dollar, sea urchin, and cucumbers). Invertebrate are dominant, Earliest fish that were jawless and later, jawed and armored fish. -
Silurian Period 435- 395 MYA
earliest terrestrial plants and animals -
Devonian Period 395-345MYA
armored fish go extinct, but abundance of several species of fish.
earliest anphibians and amonites. -
Carboniferous Period 345-28 MYA
abundant sharks and amphibians. Large swamps and coal forming forests. Earliest reptiles
Scale trees and seed ferns -
Permian Period 280-255 MYA
Extinction of many types of marine animals including trilobites -
Triassic Period 225-195MYA
Earliest dinosaurs -
Period: to
Mesozoic Period
Middle Life -
Jurassic Period 195-136MYA
Earliest birds and mammals
abundant dinosaurs and ammonites -
Cretaceous Period 136-65MYA
Earliest flowering plants, climax of dinosaurs followed by their extinction. Great decline of brachiopods. Abundance of bony fish. -
Tertiary Period 65-1.8MYA
Earliest Placental Mammals, modern mammals, large running mammals -
Period: to
Cenozoic Period
New Life -
Quaternary Period 1.8MYA-2010
Large Carnivores, Neauderthals, Humans, Mastodons
