Name/Title
S04.07.005Description
The image shows a close-up of a section of Ohio Division of Geological Survey's core DGS 3275 at the interval of 1223.8 to 1224.3 feet. This section shows the Logana Member of the Lexington Limestone. This core section comes from the transition zone of the Serpent Mound Impact Structure, which has dolomite, shale, limestone, sandstone, and siltstone lithologies. Because of the geologic forces that have acted on the site of the impact structure, bedrock in the area is a mixture of uplifted, down dropped, faulted, folded and eroded rock from the Ordovician, Silurian, Devonian and Mississippian Geologic Periods.
In 1979, John L. Carroll Mineral Exploration of New York City drilled two core holes in the Serpent Mound Impact Structure in Bratton Township, Adams County, Ohio. The two core holes were donated to the Ohio Division of Geological Survey in 1993. Ohio Division of Geological Survey geologists examined the two John L. Carroll Minerals cores in detail in 1996. At that time, some core intervals were found to be missing (25 meters in DGS 3275). The second hole, identified as DGS 3275, was drilled in the transition zone to a depth of 629 meters penetrating Upper Cambrian to Middle Silurian limestone, shale, dolomite and sandstone that have been fractured, faulted and brecciated. In the upper two-thirds of DGS 3275, beds are displaced 92 to 122 meters below their undisturbed structural position and dip from 15 degrees to 90 degrees. In the lower one-third, mildly deformed to undeformed Ordovician rocks dip from 0 degrees to 20 degrees and have 18 to 24 meters of downward displacement. Specific details regarding faults, breccias, shatter cones, slickenlines, stylolites, mineralization, and other features can be found in the lithologic descriptions and graphic logs for cores in Subsurface Geology of the Serpent Mound Disturbance, Adams, Highland, and Pike Counties, Ohio by Mark T. Baranoski, Gregory A. Schumacher, Doyle R. Watts, Richard W. Carlton, and Belgasem M. El-Saiti (Report of Investigations No. 146) published by the Ohio Division of Geological Survey in 2003.
This slide image included in the USGS National Digital Catalog for NGGDPP Grant G15AP00115 in FY2015.Context
Closeup of cylindrical rock core sample; lying on red felt. Sample stored by Ohio Geological Survey.