-
500 BCE
Cambrian Period (570-500 MYA)
Abundant animals
mass extinctions
abundance of plants
continental shifts
worldwide climate -
435 BCE
Ordovician Period (500-435 MYA)
Echinoderms dominate a majority of the planet.
Mollusks become abundant.
Earliest fish appear. -
395 BCE
Silurian Period (435-395 MYA)
Earliest terrestrial plants and animals appear.
Tiktaaliks appear.
Eurypterids develop. -
345 BCE
Devonian Period (395-345 MYA)
Armored fish go extinct.
Regular fish appear.
Earliest amphibians arrive.
Ammonites. -
280 BCE
Carboniferous Period (345-280 MYA)
Abundance of sharks/amphibians.
Large swampy forests dominate the planet, forming lots of coal over millions of years.
earliest reptiles.
Scale trees/seed ferns -
225 BCE
Permian Period (280-225 MYA)
Amphibians dominate.
mass extinction, 95% of marine species, and 50% land animals completely wiped out -
195 BCE
Triassic Period (225-195 MYA)
Earliest dinosaurs arrive. as well as cycads and conifers. -
136 BCE
Jurassic Period (195-136 MYA)
Earliest birds appear, as well as mammals, oh yeah, also big dinosaurs, BIIIG dinosaurs. -
65 BCE
Cretaceous Period (136-65 MYA)
Earliest flowering plants appear. also my favorite dinosaur, the Deinonychus (or "terrible claw")
also sadly, a mass extinction 65% of species, including the dinosaurs, were wiped out. -
1 BCE
Tertiary Period (65-1.8 MYA)
earliest placental mammals appear. as well as some modern mammals -
1 CE
Quaternary period (1.8 MYA - Today)
Large carnivores appear, as well as neanderthals, there were also some mastodons early on.
