Significant mass extinctions occurred during which of the following epochs? A.Pleistocene, Ordovician, and Triassic B.Ordovician, Triassic, and Jurassic C.Triassic, Permian, and Cretaceous D.Triassic, Permian, Cretaceous, Pleistocene, Ordovician, and Devonian E.Ordovician, Triassic, Jurassic, Silurian, Eocene, and Oligocene Solution Ans d triassic, permian, cretaceous pleistocene, ordovician, and devonian These are the largest mass extinctions in the earth history. Many species got extincted in short period of time..