The Geologic Timescale

Cambrian [570-500MYA]

Jan 1, 1909

Earliest record of Marine life such ass the trilobites. The trilobites were the most dominant in this time period. have many fossils all around the world. Come in many different shapes and sizes.

Ordovician [500-435 MYA]

Jan 1, 1921

Echinoderms were the dominant species during this timeline. The species consisted of invertebrates. Invertabrates such as Starfish, Sand dollar , sea urchin and sea cucumbers. Fishes that are jawless, and later jawed and armored came along.

Silurian [435-395MYA]

Jan 1, 1932

Earliest plants and animals. Tiktaalik represents an intermediate form between fish and amphibians. More fishlike animals and creastures.

Devonian [395-345MYA]

Jan 1, 1939

Armored fishes and animals die out. Newer species of fish bvegin to flourish. Jawless fishes started.

Carboniferous [345-280MYA]

Jan 1, 1948

Abundance of sharks and fishes began. Larges swamps and moaps began to form. Reptiles, seed ferns, scaled trees began to form.In addition to having different conditions for the start. Many biological, geological, and climatic events occurred during this time.

Permian [280-225MYA]

Jan 1, 1959

Extinction of many marine mammals. Also including the trilobites.

Triassic [225-195 MYA]

Jan 1, 1969

The earliest dinosaurs, alot abundant cycads. Lots of conifers also.

Jurrassic [195-136 MYA]

Jan 1, 1974

Early birds, mammals, abundant dinosaurs and ammonites.

Cretaceous 163-65 MYA

Jan 1, 1984

Earliest Flowering plants, climax of the dinosaur,extinction of dinosaurs. Advances of fish

Tertiary 18-1.8 MYA

Jan 1, 1997

Mammals began to emerge, Wiped out dinosaurs. NEw species of plants, flowering plants.

Quarternary 18 MYA-Present

Jan 1, 2008

SEcond and last period of Cenozoic period. Divided into two epochs.