Geologic Timeline

Cambrian Period

Sep 22, 1926

The Cambrian Period was when life first boomed. All life was aquatic. Trilobites were pretty dominant. Pangea is formed.

Ordovican

Sep 22, 1937

Echinoderms and invertabres were majorly dominant. Life was mainy aquatic. The continents were formed, but inhospitable. (500M- 435M)

Silurian

Sep 22, 1944

Terestrial plants and animals begin, as ozone forms, making the surface hospitable. Tiktaalik and Eurypterids arfe dominant. (435M- 395M)

Devonian

Sep 22, 1953

Amphibians and ammonites begin to take form. Armored fish go extinct. (395M- 345M)

Carbiniferous

Sep 22, 1964

Sharks and Amphibians are abundant. Swamps and coal forests form on the surface and scale trees and seed ferns are abundant. Reptiles form. (345M- 280M)

Permian

Sep 23, 1974

Trilobites and many other marine animals go extinct. Reptiles develop. Permian extinction due to a mantle eruption takes place, wiping out a majority of life. (280M- 225M).

Triassic

Sep 23, 1979

Early Dinosaurs, Cycads, Conifers are abundant. Earth begins a period of warming. (225M- 195M).

Jurassic

Sep 23, 1989

Earliest dirds and mammals develop. Dinosaurs, Ammonites are abundant (195M- 136M).

Cretaceous

Sep 23, 2002

Early flowers develop. Climax of Dinosaurs, extinction. KT extinction takes place, sagain killing much of life (136M- 65M).

Tertiary

Aug 23, 2013

Earliest Placental Mammals begin to develop. Modern mammals, begin to form (65M- 1.8M).

Quaternary

Sep 23, 2014

Large Mammals, humans and Mastadons develop, as a global cooling trend ends (1.8M- Present).