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The Michigan Geological Repository for Research and Education at É«É«À² Michigan University archives drill cuttings from more than 20,000 wells. Most were drilled for oil, gas and minerals. Review the , showing their location, surface location, API number, permit number, well name, original driller's name and core depths.

These samples are smaller pieces of subsurface rocks cut by the drilling bit, generally the size of sand or somewhat larger. These are usually examined using a microscope. Samples yield valuable data about rock composition. That data can address questions about natural resource location, quality and extent.

Samples are usually taken at ten foot intervals. Our inventory lists the depth ranges shown on boxes containing envelopes or vials of cuttings. We cannot guarantee that the entire depth shown was sampled. However, The inventory shows whether cuttings are contained in small vials (from which we usually can't give samples because of the limited quantity) or in envelopes (from which we can often provide samples). Some cuttings have been mounted to long strips of cardboard and are easily compared to wireline logs because they are the same scale; they cannot be sampled.