***UPDATED*** MICHIGAN BASIN CORE RESEARCH LABORATORY - This collection, housed at Western Michigan University, contains over 1250 wells and nearly 400,000 feet of core. The index is sorted by county and lists section, township and range, operator, Well name, Permit number, API number,and footage cored. - More information about this repository
MARATHON OIL COMPANY - Marathon Oil Company's Collection of Michigan Well cores. Currently housed at Western Michigan University.
UNIVERSITY OF MICHIGAN CORE COLLECTION - Currently housed at Western Michigan University.
***UPDATED***WAYNE STATE UNIVERSITY - Wayne State University collection contains 74 wells and about 12,000 feet of core predominately from Southeastern and Central Michigan, some wells are now at Western Michigan University.
TEXAS BUREAU OF ECONOMIC GEOLOGY - Large collection of over 140 wells in the collection of the Texas Bureau of Economic Geology. Most wells were drilled by Shell or Sun Oil Companies. Contact the Texas BEG for more information regarding these cores, some wells are now at Western Michigan University.
STATE OF MICHIGAN OIL AND GAS WELL CORES - Oil and gas core from Michigan's Lower Peninsula Currently housed at Western Michigan University. - Also stored at this facility (More information about this repository) are mining cores from the Upper Peninsula and miscellaneous mineral well cores, environmental well cores, outcrop samples and drill cuttings from mineral wells. Catalogue of the Complete collection in Marquette, Southern Peninsula cores and cuttings have been mover to Western Michigan University
U.S.GEOLOGICAL SURVEY MICHIGAN CORES - Small collection of Michigan cores stored at the U.S.G.S. repository in Denver. This repository has a large national collection indexed by state.
UNOCAL MICHIGAN CORES Unocal's Michigan core collection housed at C&M Facility in Schulenberg, Texas. There are 14 cored wells in this collection.
Central Michigan University Geology Department - Currently housed at Western Michigan University collection consists of about 15 cored wells, about 1000 feet of core, and a large catalogued collection of drill cuttings.