Pokagon State Park: Ice Age Legacy (GM-30)
Pokagon State Park is truly an Ice Age legacy. The irregularly shaped hills, bogs, and lakes are underlain by materials left after melting from a vast disintegrating glacier a mere 14,000 years ago.
Some features in this area are long gravel ridges called crevasse fillings or eskers and irregular sharp-crested hills called kames. Some masses of ice were buried by debris at an early time during the glacier's melting. These blocks melted long after all other ice was gone, and kettle holes were formed. The largest of these features are Pokagon's lakes. The area abounds with glacial erratics, boulders of rock types not native to Indiana that the glacier carried into the area from Canada.
Our Hoosier State Beneath Us: Geomorphology