Map MG-4 shows the locations of more than 800 cores stored at the ODNR Division of Geological Survey’s H. R. Collins Repository. Each core location contains a color-coded symbol for the Geologic System or Period present at the total depth of that core, a Geological Survey core identification number, and the stratigraphic range of that core. A table of Ohio’s stratigraphic nomenclature used on the map is included, as well as a summary of the core collection by stratigraphic sequence. The cores were drilled by private citizens, company representatives, government officials, and researchers, who then donated the core samples (and often core descriptions) to the Division of Geological Survey.
Cores are cylinders of rock, usually two inches in diameter, that can yield information about natural resources issues, such as ground water availability and location of oil and gas resources. The updated map will be particularly useful for citizens, industry personnel, and researchers who use information from rock cores drilled throughout the state to determine such things as depth, thickness, and type of bedrock found in a specific area.
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Paper map price: $10.00 (plus tax and shipping)