Geology timeline

Cambrian

Sep 22, 1926

The Cambrian period was the beginning of the Paleozoic era, the earliest record of marine life. 570 M - 500 MYA

Ordovician

Sep 22, 1937

Invertabrate were dominant, mpllusks became abundant. Earliest fish that are jawless and later, jawed and armored fish. 500 M - 435 MYA

Silvrian

Sep 22, 1944

Eariest terrestrial plants and animals. Tiktaalik Eurypterids develop. 435 M - 395 MYA

Devionian

Sep 22, 1953

Armored fish go extinct, but abundence of several species of ish. Earliest amphibians and ammonites. 395 M - 345 MYA

Carboniferous

Sep 22, 1964

Abundant skarks and amphibians. Large swamps and coal forming forest. Earliest reptiles. 345 M - 280 MYA

Permian

Sep 22, 1974

extinction of many types of marine animals including trilobites. 280 M - 195 MYA

Triassic

Sep 23, 1979

Earliest dinosaurs, abundant cycads and conifers. 225 M - 195 MYA

Jurassic

Sep 23, 1989

Earliest birds and mammals abundant dinosaurs and ammonites. 195 M - 136 MYA

Cretaceous

Sep 23, 2002

Earlist flowering [plants, climax of dinosaurs followed by their extinction. Great decline of brochinopods. Abundant of bony fish. 136 M - 65 MYA

Tertiary

Sep 23, 2013

Earlist placental mammals, modern mammals, large running mammals. 65 M - 1.8 MYA

Quaternary

Dec 23, 2013

Large carnivors, neanderthals, humans, mastodon. 1.8 M - Present