Copperas Mountain, Paxton Township, Ross Co., Ohio, USA
|Latitude & Longitude (WGS84):||39° 13' 57'' North , 83° 11' 52'' West|
|Latitude & Longitude (decimal):||39.23250,-83.19778|
|Köppen climate type:||Cfa : Humid subtropical climate|
The Copperas Mountain exposure is adjacent to a dirt road (Copperas Mountain Road) and Paint Creek, which eroded the 350' cliff. Exposed at the site is the Ohio Shale, with the overlying Bedford Shale and Berea Sandstone. The Ohio Shale (3/4 of the exposure, starting at the road elevation) is divided here into the Huron and Cleveland Shales.
The site is well known for large concretions, 1 to 5 feet in diameter, with soft septarian centers, often mineralized with dolomite, barite, quartz, calcite, and pyrite. Pyrite nodules (2"-5") also weather out of the shale.
Mineral efflorescences cover significant areas of the cliff exposure. Fibrous masses of halotrichite-pickeringite (white), melanterite (blue-green, "copperas" - used in the past to dye cloth), and copiapite (yellow, "yellow copperas") can be found.
The cliff is unstable, with significant rotting to the exposed shale.
8 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
252.17 - 541 Ma
|Paleozoic sedimentary rocks|
Age: Paleozoic (252.17 - 541 Ma)
Lithology: Sedimentary rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. 
358.9 - 419.2 Ma
Age: Devonian (358.9 - 419.2 Ma)
Stratigraphic Name: Ohio Shale
Description: Shale; brownish black to greenish gray, weathers brown; carbonaceous to clayey, laminated to thin bedded, fissile parting; carbonate and/or siderite concretions in lowermost 50 feet; petroliferous odor; 250 to 500+ feet thick. Includes Olentangy Shale south of central Delaware Co.
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052.