The Standard Geological Column
Periods Time Span Fossils
Holocene Recent

Pleistocene 1mil whale,man

Pliocene 5mil cats

Miocene 10mil solitary coral,Gigantopithecus

Oligocene 40mil elephant type

Eocene 50mil rays,frogs,swifts,bats

Paleocene 70mil dawn horse (Hyracotherium)

Cretaceous 150mil worms,ammonites,mosasaur,snake,bird

Jurassic 200mil lobsters,crabs,insects,
squid, plesiosaur,pterosaur,
archaeopteryx, mammals

Triassic 230mil turtle,land reptiles,cynodont

Permian 280mil lizards

Carboniferous 370mil clams,shrimp,spiders,scorpion,
dragon flies,urchin,amphibian

Devonian 410mil Clymeniid

Silurian 435mil solitary coral,snails,sea/land plants,fish

Ordovician 500mil coral,brachiopod,nautiloids,star fish,
sea plants

Cambrian 550mil trilobites

Pre-cambrian 4 600mil bacteria, algae