Wisconsin Geology

Explore Wisconsin’s geologic past, from our bedrock to the Ice Age and beyond.

This section provides an overview of Wisconsin’s geology, including an introduction to our landscape features and how geology shaped our landscape. You can learn how to read a geologic map, find information on Wisconsin’s minerals and fossils, and see an overview of iron and frac sand mining. You’ll also find videos of public talks our staff have given Wisconsin’s geology and blog posts about our geologic research.