-
570 BCE
Cambria
The Cambrian was the first geological period of the paleozoic era. The Cambrian lasted about 55.6 million years. -
500 BCE
Ordovician
The Ordovician period occured almost 45 million years ago, Beginning 488.3 million years ago and ending 443.7 million years ago. During this period the world was almost mostly ocean. -
435 BCE
Silurian
The Silurian Period was the earliest to contain terrestrial plants and animals. Occurred from 443 million to 416 million years ago. It was the third period in the Paleozoic Era. -
395 BCE
Devonian
The Devonian is a geologic period and system of the Paleozoic, spanning 60 million years from the end of the Silurian, 419.2 million years ago to the beginning of the Carboniferous, 358.9 Mya -
345 BCE
Carboniferous
Abundant sharks and amphibians. Large swamps and coal forming forests. Earliest reptiles. Scale trees and seed ferns started to grow -
280 BCE
Perin
The Permian is a geologic period and system which spans 46.7 million years from the end of the Carboniferous Period 298.9 million years ago, to the beginning of the Triassic Period 252.2 Mya. Extinction of many types of marine animals including trilobites. -
225 BCE
Triassic
Earliest Dinosaurs, abundant cycads and conifers -
195 BCE
Jurassic
Earliest birds and mammals abundant dinosaurs and ammonites. -
136 BCE
Cretaceous
Earliest flowering plants, climax of dinosaurs followed by their extinction. Great decline of brachiopods. Abundance of bony fish -
65 BCE
Tertiary
Earliest Placental Mammals, modern mammals, large running mammals
