Corys Geologic Timeline

Cambrian 570-500 MYA

Sep 16, 1925

The earliest form of life, a triloite, is the dominant animal.

Ordovician 500-435 MYA

Sep 16, 1936

There are animals like the starfish, sand dollar, sea archin, and the sea cucumber. Although the invertebrates are still dominant and the mollusks become abundant. Fish begin to show up, they start off jawless but develop jaws and armor over time.

Silurian 435-395 MYA

Sep 16, 1943

The earliest terrestial plants an animals are developing. The Tilktaalik Eurypterids develops.

Devonian 395-345 MYA

Sep 17, 1952

The armored fish go extinct but many other fish types eveolve

Carbonferous 354-280 MYA

Sep 17, 1963

Sharks and amphibians are abundant. Earliest reptiles, scale trees, and seed ferns. Large swamps and coal forming forests.

Triassic 225-195 MYA

Sep 17, 1968

The earliest dinosaurs show up now. Abundant Cyads and Conifers.

Permian 280-225 MYA

Sep 17, 1973

Extinction of Trilobites including many other types of marine animals

Jursassic 195-135 MYA

Sep 17, 1978

Abundant dinosaurs and ammonities. Earliest birds and mammals.

Cretaceous 136-65 MYA

Sep 17, 1991

Abundance of bony fish. Earliest flowering plants, climax of the dinosaurs followed by their extinction. Huge decline of brachiopods.

Tertiary 65-1.8 MYA

Sep 17, 2002

Earliest placental mammals, moderns mammals, large running mammals.

Quaternary present-1.8 MYA

Dec 17, 2002

Large carnivores, neanderthals, humans, mastodons.