Name/Title
S04.04.001Description
Example of the upper highly disturbed block interval of core DGS 3274. This section has reverse fault filled with breccia containing very small (less than 3 mm in diameter) shale and carbonate clasts and a few black clasts embedded in a very finely pulverized matrix. The section comes from DGS 3274, Box 100 (281 meters) for Ordovician Fairview and Kope Formations undivided. The image was used for 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, Figure 11, page 20) published by the Ohio Division of Geological Survey in 2003.
The Serpent Mound Impact Structure is an approximately 9-mile-diameter area of highly disturbed and structurally deformed bedrock at the intersection of Adams, Highland and Pike counties. The deeply eroded crater is believed to have been formed by an asteroid or a comet impact approximately 250 to 300 million years ago. It is named the Serpent Mound Impact Structure after the prehistoric American Indian effigy earthwork located near the southwestern edge of the area. It is the single-most complex geologic structure exposed at the surface in Ohio. Investigation of the impact structure has been done using rock cores, seismic data, geophysical surveys and remote satellite imagery for the area. The area of the impact structure has dolomite, shale, limestone, sandstone, and siltstone lithologies. Because of the geologic forces that have acted on the site of the impact crater, 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.
This slide image included in the USGS National Digital Catalog for NGGDPP Grant G15AP00115 in FY2015.Context
Gray and fractured rock samples in boxes. Found from Serpent Mound Impact Structure in Adams County, Ohio.