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The Michigan Geological Repository for Research and Education's core collection represents almost all the formations found in Michigan. We have prepared lists of cores from some of the most frequently searched formations. Because we acquire new cores from time to time, we may have additional cores not yet shown on these spreadsheets.

Most commonly searched formations

• Antrim cores
• Detroit River cores
• Mt. Simon cores
• Niagaran cores
• Reed City cores
• Salina A1 carbonate (Ruff Fm) cores
• Salina A1 salt cores
• St. Peter and Glenwood cores
• St. Peter cores with core analyses and thin sections
• Trenton-Black River cores
• Utica Collingwood cores