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Cambrian
Earliest record of Marine life, Trilobites are dominant, there was fragments of Rhodina scattered about, there was a low number of oxygen sucking bacteria making the oxygen levels in the water rise, and the climate was most likely warmer and more stable than it is today -
Ordovician
Echinoderms and invertebrates are dominant, Mollusks become abundant, the earliest fish appear which are jawless, most of the worlds land was in the south creating the super content Gondwana, and there was extreme climate fluctuations -
Silurian
Earliest terrestrial plants and animals, Tiktaalik Eurypterids develop, there was melting of large glacier formations, evidence of first known fresh water fish, and there's also evidence of the first arachnids -
Devonian
Armored fish go extinct, abundance of other types of fish, earliest amphibians and ammonites, evidence of first land-living vertebrates, there was a mass extinction, and there was two supercontinents Gondwana and Euramerica -
Carboniferous
Spilt into the mississippian and the pennsylain, abundance of sharks and amphibans, Large swamps and coal forming forests, earliest reptiles, scale trees, and seed ferns -
Permian
Mass extinction of marine life inculding trilobites, the forest that were in the Carboniferous period are gone, there were lots of deserts, and the supercontinent Pangea was formed -
Triassic
Earliest dinosaurs, abundance of cycads and conifers, Pangea started drifting into two landmasses Laurasia and Gondwana, and ther Permain- Triassic extinction was devasting to terrestrail life -
Jurassic
Earliest birds and mammals, abundance of dinosaurs and ammonites, and many of the deserts in the Triassic were now rainforests, -
Cretaceous
Earliest flowering plants, a great decline in brachiopods, and an abundance of bony fish, one of the first apparences of the insects we know today, and one of the most famous extinctions marks the end of the Cretaceous period -
Tertiary
Earliest placental mammals, modern mammals, and running mammals, and the climate slowly started cooling -
Quaternary
Large carnivores, neanderthals, and mastodons; permanent ice sheets formed on Antarctica, there was a mass extinction of large mammals, and there were several glacial advances and retreats
