Phil Druker/Department of English/ University of Idaho

Major ice ages of the Pleistocene.

Pleistocene Epoch 1.8 to 0.15 Ma (Holocene Epoch since 0.15 Ma)

Ice sheets extended into temperate regions multiple times:

n  Wisconsin                   0.20 – 0.018 Ma

                                                                        0.20 m.y. interglacial

n  Illinoian                      0.55 – 0.40 Ma

                                                                        0.40 m.y. interglacial

n  Kansan                       1.40 – 0.95 Ma

                                                                        0.35 m.y. interglacial

n  Nebraskan                 2.00 – 1.75 Ma