-
500 BCE
Cambrian period- 500-570 mya
Earliest record of marine life. Trilobites are dominant. There was a cold climate but it grew warmer and there was rising sea levels flooding low lying land masses. There were one celled algae but not a lot of plants. -
500 BCE
Ordovician period 500-435 mya
Echinoderms(starfish, sand dollars) invertebrates are dominate, mollusks are abundant. Jawed and armored fish. -
435 BCE
Silurian period 435-395 mya
earliest terrestrial plants and animals. Tiktaalik Euryperterids develop -
395 BCE
Devonian period 395-345 mya
armored fish go extinct but abundance of several species of fish.Earliest amphibians and ammonites. -
345 BCE
Carboniferous period 345-280mya
abundant sharks and amphibians. Large swamps and coal forming in forest. Earliest reptiles. Scale trees and seed ferns. -
280 BCE
Permian period 280-225 mya
extinction of many type of marine animals including trilobites due to large volcanic eruptions. 95% of species went extinct. -
225 BCE
Triassic period 225-195 mya
earliest dinosaurs, abundant cycads and conifers -
195 BCE
Jurassic period 195-136 mya
earliest birds and mammals. abundant dinosaurs and ammonites -
136 BCE
cretasious period 136-65mya
earliest flowering plants. climax of dinosaurs followed by their extinction. Great decline of brachiopads. abundance of bony fish. Extinction of 65% of species including dinosaurs. -
65 BCE
Teritary period 65-1.8 mya
earliest placental mammals, modern mammals, large running mammals -
1 BCE
Quaternary 1.8m-present
large carnivores, neanderthals, humans, mastodons
