-
Palezoic periods- cambrian 570M-500M
earliest record of marine life
Triobites are dominant -
Palezoic periods- Ordovician 500M-435M
Echinoderms(starfish,sandollar,sea urchin and sea cucumbers)
Invertebrates are dominant mollusks become abumdant. Earliest fish that are jawless and later armored fish. -
Palezoic perios- Silvrian 435M-395M
Earliest terrestial plants and animals
tiktaalik eurpterias develop -
palezoic period- Devonian 395M-345M
Armored fish. Earliest amphibians and ammonties -
palezoic period-carboniferous 345M-280M
abundunt sharks , cool forming forests and earliest reptiles -
Palezoic period- permian 280-225M
-
Mesozoic period-triassic 225M-195M
earliest dinosaursmabundant cycads and conifers -
Palezoic period-jurassic 195M-136M
Earliest birds and mammals -
meszoic era- cretacious 136-65M
-
Cenozoic period-tertiary 65M-1.8M
earliest placental mammals,modern animals,large running mammals -
palezoic periods-quarternary 1.8M-present
Large carnivores, neanderthals humans, mastodans
