Glen Echo Ravine, Columbus, Franklin Co., Ohio, USA
|Latitude & Longitude (WGS84):||40° 1' 9'' North , 82° 59' 55'' West|
|Latitude & Longitude (decimal):||40.01917,-82.99861|
Glen Echo Ravine is one of a series of ravines that drain into the Olentangy River in the City of Columbus. All of these ravines cut into the Ohio Shale, found in the Devonian bedrock exposed in a strip in the center of Ohio, running from Adams/Scioto counties in the south, up through the heavily populated counties along the shore of Lake Erie.
Sources describing minerals in the Ohio Shale in the northern part of the state can be applied to the Ohio Shale in general: it is a similar geology. Thus a similar pattern of mineralized concretions (containing ferroan dolomite, calcite, quartz, barite, and aragonite), pyrite disks, and mineral efflorescences (alunogen, botryogen, copiapite, epsomite, gypsum, hexahydrite, melanterite, ferroan pickeringite, and rozenite) can be found in central Ohio exposures of the Ohio shale. In addition, chert nodules weathered out of limestone can be found in the stream beds.
Glen Echo ravine runs about 2.5 miles from I-71 west to the Olentangy River. It is easily accessible at Glen Echo Park (the lat/long below). Bridges and tunnels make exploration of the Ravine a bit difficult, but it is possible to walk most of the ravine down to the Olentangy River.
Efflorescences, cone-in-cone calcite, and pyrite are found in the upper part of the Ravine, near Glen Echo Park. Between Indianola Ave. and High St. mineralized concretions can be seen, some as large as 6 feet across. Pyrite disks or "suns" can also be found between plates of the shale in the middle and lower part of the Ravine.
This is an urban site, so be prepared for a bit of graffiti, ne'er-do-well teenagers, junk, and the occasional homeless person living in a tent.
16 valid minerals.
Rock Types Recorded
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Entries shown in red are rocks recorded for this region.
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
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. 
Carlson, Ernest H. (1991), Minerals of Ohio. Ohio Department of Natural Resources.
Carlson, Ernest H. (2002), Jerret Whitford. "Occurrence And Mineralogy Of Efflorescence In Late Devonian Black Shales, North-Central Ohio." 2002 GSA Meeting.
Carlson, Ernest H. et al (2009), "Mineralogy And Paragenesis Of Large Dolostone Septaria in the Late Devonian Huron Shale, North-Central Ohio." Rocks and Minerals: 84 (March/April).
Vasichko, Joe, Septarian Minerals of the Huron River near Lamereaux Road Bridge, Monroeville, Huron Co., Ohio.