Wisconsin
Wisconsin includes ancient Precambrian rocks in the north, Paleozoic sedimentary rocks in the south and east, and widespread glacial deposits. The state is known for granites and metamorphic rocks in the north, fossil-bearing limestones and dolostones, and glacially transported stones that make collecting especially varied.
At a glance
- Common rock types: granite and gneiss (north), limestone/dolostone and sandstone (south/east), glacial till and gravels
- Notable materials: building stone, fossil-bearing carbonates, glacial erratics and mixed cobbles
- Where they come from: ancient craton rocks, shallow marine sediments, and repeated glaciations
What collectors look for
Collectors often focus on fossils in carbonate rocks, interesting igneous/metamorphic stones in the north, and diverse glacial gravels. Always follow collecting rules and access guidelines.
- Common rock types: granite and gneiss (north), limestone/dolostone and sandstone (south/east), glacial till and gravels
- Notable materials: building stone, fossil-bearing carbonates, glacial erratics and mixed cobbles
- Where they come from: ancient craton rocks, shallow marine sediments, and repeated glaciations
What collectors look for
Collectors often focus on fossils in carbonate rocks, interesting igneous/metamorphic stones in the north, and diverse glacial gravels. Always follow collecting rules and access guidelines.