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cambrian priode 570-800 MYA
this periode is 5 times longer then any other periode. this periode allso contains two other periodes which are the protozoic arckean. the oldest fossiles ar said to be from this time era and are 300myo. -
Ordovician 500-435 MYA
star fish and sand dollars begin to apear. invertibrates are dominant mullosks become abundant earlist fish begin to apear and jawed fish and armored fish apear. -
Silurian 435-395 MYA
earlist terestrail animals begin to apear plants as well tiktaalik eurypterids begin tio apear. -
Devonian 345-280 MYA
armored fish go extinct earlist amphebians begin to surface -
Carboniferous 345-395 MYA
(mississsipian and pennsylvanian) abundant sharks and anfibeans larg swamps coal forming forests allso the earlist reptiles. scaled trees and seed baring trees begin to apear -
Permian 280-225 MYA
the extinction of many marine animals( trileobites) -
Triassic 225- 195MYA
earlist dinosaoures bigin to develope. abundent cycads and conifers -
Jurassic 195-136 MYA
earlist bireds and mamals allso and abundant were the dinosaoures and the ammonites -
Cretaceous 163-65 MYA
earlist flowering plants, climax of the dinasoures extinction of the dinosaoures decline of the bracheopods advance of bony fish -
Tertiary 18-1.8 MYA
mammals begin to emerge,The extinction event at the close of the Cretaceous Period wiped out the dinosaurs, large reptiles, and many other species. This left room for new animals to develop Hominids: Human Ancestors The Tertiary Was For The Birds Boney Fish and Sharks Develop New Species Flowering Plants Means Nectar For Insects The Tertiary Period Ends With An Ice Age and Land Bridges -
Quaternary 18 MYA - to present
Quaternary period was the second and last period of the Cenozoic era. Quaternary period is divided into two epochs: Pleistocene and Holocene. Mammoths roamed the lands. Cattle, deer, and of course, Homo habilis, Homo erectus, and Homo sapiens.
