earth began

ocean forms and cover the earth

bacteria appear

soft bodied multi cellular

organisms appear

shallow seas cover much of the land 

corsl reefs develop

seas riseand fall over North America

Appalachion maintains from 

Pangeiea froms

Great eplosion of invertebrales in the sea

Trilbrates in the sea 

land plants appear

insects and spider appear 

Age of fish begins

First reptiles appear

Trilopites became exinct

hot,dry conditions dominate pangaea 

Pangaea splits

Widespread volcanie activity

Dinosaurs appear

largeat dincsaurs thrive

Dinosaurs decame extinct 

pocky mountains and himalayas from 

continental gaciers cover antartica 

Ice age ends 

First grassess appear 

Humans appear

Mammals,flowering plants,and insects daminate the land