Name/Title
S04.01.020Description
An outcrop of the Peebles, Greenfield and Tymochtee Dolomites at the Fulton Quarry site near the intersection of Wallace Road and Ohio State Route 73 north of Peebles in Adams County, Ohio. The outcrop shows faults in the Peebles Dolomite at the location of the outer ring-graben and boundary fault of the Serpent Mound Impact Structure. This area 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. The photograph was taken by Stephen P. Reidel for the description of Stop 2 in the Serpent Mound Cryptoexplosion Structure, Southwestern, Ohio by Stephen P. Reidel and Frank L. Koucky (part of the Geological Society of America's GSA Cincinnati '81 Field Trip Guidebooks, v. 2. Economic Geology, Structure).
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.
This slide image included in the USGS National Digital Catalog for NGGDPP Grant G15AP00115 in FY2015.Context
Gravel path leading up to dolomite outcrop. Fulton Quarry site north of Peebles, Ohio.