Mass Extinction By DTandJeff Period: 488 BCE to 443 BCE Late Ordovician ANSWERS (click here) Period: 375 BCE to 360 BCE Late Devonian ANSWERS (click here) Period: 299 BCE to 251 BCE End-Permian ANSWERS (click here) Period: 252 BCE to 201 BCE End-Triassic ANSWERS (click here) Period: 145 BCE to 65 BCE End-Cretaceous ANSWERS (click here)
