The Geologic History of Iowa
1:01:28
A Brief Geologic History of Colorado
1:28:23
Glaciation and the Great Lakes, an epoch in the making; Andy Breckinridge, PhD, UW-Superior
1:11:55
Tales Told By Trilobites
18:52
Glacial Lake Missoula
26:51
Iowa Land and Sky: Loess Hills And Prairies
1:29:45
Grand Canyon: Young Canyon, Old Rocks (A journey through the geologic history of the Grand Canyon)
18:34
Catastrophe and Cartography - Ice Age Floods Visualized
2:34:32