Historical Geology Terrell

Cambrian 570-500 MYA

Feb 10, 1926

Earliest record of marine life - Trilobites are dominant

Ordovician 500m-435MYA

Feb 10, 1937

Echinoderms (starfish,sand dollar, sea urchin, sea cucumbers) Inverterbrates are dominant, mollusks become abundent. Earliest fish that are jawless and later. Jawed and armored fish

Silurian 435m - 395MYA

Feb 10, 1944

Earliest terrestrial plants and animals. Tikaalik Eurypterids devlop

Devonian 395 - 345MYA

Feb 10, 1953

Armored fish go extinct, but abundance of several species of fish. Earliest amphibians and ammonites.

Carboniferous 345- 280MYA

Feb 10, 1964

Abundent sharks and amphibians. Large swamps and coal forming forests. Earliest reptiles. Scale trees and seed ferns

Permian 280-225MYA

Feb 10, 1974

Extinction of many types of marine animals including triolbites

Turassic 225-195MYA

Feb 10, 1979

Earliest dinasour, abundent cyads and conifers

Jurassic 195-130MYA

Feb 10, 1989

Earliest birds and mammals abundants dinosours and ammonites

Cretaceous 136-65MYA

Feb 10, 2002

Earliest flower plants

Teritary 65-1.8MYA

Feb 12, 2013

Earliest placental mammals, modern mammals, large running mammals

Quaternary 1.8-presentMYA

Feb 12, 2016

large carnivores, neanderthals, humans, mastodons