Between 15, 000 and 13, 000 years ago, a Pleistocene Ice Age glacier moved through the Purcell Trench in northern Idaho, damming the Clark Fork River.
32.
Less is known about Appalachian biodiversity in the Cretaceous as few fossiliferous deposits exist in the region today and half of the fossil beds in Appalachia were destroyed during the Pleistocene ice age.
33.
The Pleistocene ice age glaciation of Puget Sound created many of the geographical features of the region, including Puget Sound itself, and the erratics are one of the remnants of that age.
34.
The morphological similarity gave rise to the hypothesis that the populations were sympatric as recently as the last Pleistocene Ice Age, approximately 15, 000 years ago, but subsequent genetic analyses suggest otherwise.
35.
The Old Crow Flats and basin was one of the areas in Canada untouched by glaciations during the Pleistocene Ice ages, thus it served as a pathway and refuge for ice age plants and animals.
36.
During the Pleistocene ice age the lower Thames is believed to have been diverted well to the south of its earlier course closer to the main axis of the basin, probably by the Anglian Stage.
37.
The overall decline in sparassodont diversity from the late Miocene to the end of the Pliocene may be linked to the cooling climates following the middle Miocene climatic optimum and the onset of the Pleistocene ice ages.
38.
When sea levels fell as the Pleistocene ice ages took hold, the thousands of feet of sediment layers in the Salisbury Embayment were exposed as the Coastal Plain terrains of Delaware, Maryland and eastern Virginia.
39.
During the Pleistocene Ice Ages, so much water was removed from the oceans and stored on land as year-round glaciers that the ocean regressed 120 m, exposing the Bering land bridge between Alaska and Asia.
40.
Geologically the district is predominantly greywacke of Late Jurassic to Late Cretaceous age, draped by wind-blown loess during the Pleistocene Ice Ages and more recently covered in volcanic ash and pumice from the Rotorua and Taupo volcanic centres.
