Encyclopedias of Prehistoric Life
Explore the ancient past of the Midwest! These illustrated online guides are filled with information about the fossils of animals and plants found in the rocks just beneath our feet! New guides coming soon!
Pleistocene
Megafauna
Pleistocene
epoch
2.5 million years ago - 11,700 years ago
Large land mammals and reptiles of the Ice Ages found in the Great Plains, Great Lakes region and the Ohio River valley
Western Interior Sea
Late Cretaceous
Period
100 - 66 million
years ago
Marine reptiles, birds and invertebrates found in the seas which covered the Great Plains during the Cretaceous period
Ogallala Formation
Miocene & Pliocene epochs
10 - 12 million
years ago
Fossils of mammals, birds, reptiles, invertebrates and plants are found throughout layers of soil and ash in the central Plains region
