The Michigan Geological Repository for Research and Education at Western Michigan University archives more than 530,000 linear feet of Michigan well cores. Additional Michigan cores are housed by these government agencies:
- Texas Bureau of Economic Geology: This spreadsheet lists over 140 wells, most drilled by Shell or Sun Oil Companies. Cores from some of these wells are also housed at MGRRE.
- Michigan Department of Natural Resources, Office of the Michigan Geological Survey: The Geologic Core and Sample Inventory includes the counties of Alger, Baraga, Bay, Chippewa, Delta, Dickinson, Gogebic, Houghton, Ingham, Iron, Jackson, Keweenaw, Luce, Mackinac, Marquette, Menominee, Ontonagon, Saginaw, Schoolcraft and Tuscola. Also available from the state are scanned digital oil and gas records for all of Michigan.
- U.S. Geological Survey, Michigan: This collection of cores is from six Michigan wells. It also contains information about cuttings from 12 wells housed at the USGS repository in Denver.
- Unocal Michigan Cores: This collection represents 14 cored wells housed at the CGG Facility in Schulenberg, TX.