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The Illinois State Geological Survey is the legislatively
mandated repository for all drilling records and drill-hole
samples in the State of Illinois. The Geological Records Unit
(GRU) collections include records for more than 500,000 oil and
gas wells, water wells, engineering borings, and miscellaneous
test holes drilled in Illinois. The Geological Samples Library
contains approximately 70,000 sets of well-cuttings and over
15,000 rock cores. Many regions of the state lack outcrops and
road and stream cuts due to relatively flat topography. Drill
hole records and samples provide the geologic data needed for
environmental assessments, mineral resource evaluations,
engineering studies, and groundwater resource evaluation and
protection.
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