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Cambrian 570-500 MYA
Earliest record of marine life with Trilobites being the dominant species. -
Ordovician 500-435 MYA
Earliest fishes with invertebrates dominating Earth. Colentrates and mollusks become abundant and echinoderms expand in numbers and kinds. -
Silurian 435-395 MYA
Early terrestrial plants and animals peak in developement. -
devonian 395-345 MYA
Earliest amphibians and ammonites. Armored fish become extinct. -
carboniferous 345-280 MYA
Earliest reptiles and coal-forming forests. Abundant sharks and amphibians. Large and numerous scale trees and seed ferns. -
Permian 280-225 MYA
Extinction of many species of marine animals including trilobites. -
triassic 225- 195 MYA
Earliest dinosaurs, along with an abundance of cycades and conifers. -
Jurassic 195-136 MYA
Earliest birds and mammals. Abundance of dinosaurs and ammonites. -
Cretaceous 136-65 MYA
Developement of flowering plants and climax of dinosaurs and ammonites which were soon after extinct. Decline of brachipods and developement of bony fishes. -
Tertiary 65MYA- modern day
Earliest placemental mammals with many species similar to those in modern times. Humans, mastadons, mammoths, and large carnivors.
