Mass Extinctions ~ Arnav Sharma Ms. Kopchick AP environmental science By arnavsharma Period: 485 BCE to 443 BCE Late Ordovician googledoc Period: 418 BCE to 357 BCE Late Devonian googledoc Period: 299 BCE to 251 BCE End Permain googledoc Period: 251 BCE to 199 BCE End Triassic googledoc Period: 145 BCE to 79 BCE End Cretaceous googledoc
