Geologic Time Scale :)
Precambrian time began 4.6 bya it started with the formation of the earth and moon and ended with jellyfish. Bactiera dominated Precambrian time.
Paleozoic Era- 540 MYA jawed fish started it and winged insects ended it. Amphibians were most dominant.
Mesozic Era- 248 MYA age of dinosaurs started it and dinosaurs extinction ended it. Dinosaurs were most dominant during this time.
Cenozoic Era- 65 MYA eohippus started it and it is continuing on today humans were most domainant during this time.
From largest to smallest it is eons, era, period, epochs they are the times and the earth has been and it has times inside of times if you understand that we live in the Paleozoic, eon, Cenozic era quaternary peroid and the Holocene epoch.
Paleozoic Era- 540 MYA jawed fish started it and winged insects ended it. Amphibians were most dominant.
Mesozic Era- 248 MYA age of dinosaurs started it and dinosaurs extinction ended it. Dinosaurs were most dominant during this time.
Cenozoic Era- 65 MYA eohippus started it and it is continuing on today humans were most domainant during this time.
From largest to smallest it is eons, era, period, epochs they are the times and the earth has been and it has times inside of times if you understand that we live in the Paleozoic, eon, Cenozic era quaternary peroid and the Holocene epoch.