geologic time scale

Cambrian.(570-500mya)

Sep 22, 1926

earliest record of marine life, trilobitres are dominant there was no land.

Ordovician.

Sep 22, 1937

invertabrates are dominant .earliest fish that are jawless & later jawed, no land just water.

silurian.(435-395mya)

Sep 22, 1944

earliest terrestial plants and animals tiktaalik, eurypterids developed,animals started to develop to get out off the water and travel to land.

devonian.(395-345mya)

Sep 22, 1953

armored fish go extinct but abundance of several species of fish.earliest amphibians and ammonite also the animals are able to go to land

carboniferous.(345-280mya)

Sep 22, 1964

abundant of sharks & amphibians .the earth was filled with filled with large swamps and coal forming forest earliest reptiles .

permian.(280-225mya)

Sep 23, 1974

extinction of many types of marine animals do to volcanic eruptoins which was caused by the continents moving apart and continuing thier formation.Dominant aninals are the tribolites.

Triassic.(225-195mya)

Sep 23, 1979

earliest dinasours a bundant sycads and cunifers.

Jurassic.(195-135mya)

Sep 23, 1989

earliest birds and mammals abundanr of dinosaoursand ammonites .

cretaceous.(136-65mya)

Sep 23, 2002

earliest flowering plants.climax of dinosaours followed by their extinction.Great decline of drachoipods dominats species bony fish.meateors stroke the earth and killed most of animlas life.

Tertiary.(65-1.8mya)

Sep 23, 2013

earliest placental mammals (humans),modern mammals animlas wre able to adapt to their new enviroment.

Quaternary.(1.8-present)

Dec 23, 2013

large carnivors, humans are now the dominant species in the earth until what we called planet earth decides to continue the earths transformation.