Rock & Mineral Links - Michigan and Great Lakes States
The Great Lakes region includes eight states: Michigan, Ohio, Illinois, Indiana, Minnesota, New York, Pennsylvania and Wisconsin as well as Ontario, Canada. The Roamin Club is Michigan based, so our focus is on rock collecting, geology, and mining history of the "mitten" state. But, rockhounds love to travel, so the links below include the entire Great Lakes region.
Michigan Rock Information
Articles from various sources about collecting rocks in Michigan, local geology, and tour destinations that a rockhound would find interesting.
"Datolite" - Description, photos, and collection locations by county in Michigan's UP. From Michigan Tech Univ. "Beach Rocks - Datolite" - Brief description and photos of rough rock exteriors.
"Ancient Ice Ages" - Describes Gowganda Formation in Ontario and how tillite was transported to Michigan via glaciers. Gowganda Tillites - PDF explains the Gowganda Formation and location and how the tillite ended up in Ohio via glacial deposition.