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Worthington area, Franklin Co., Ohio, USA

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Ohio shale outcrops exposed in roadcuts and ravines. Baryte and calcite occurs on the surfaces and interiors of siderite concretions (some up to 3 meters in diameter) found in the shale outcrops. Most of the concretions are coated with a layer of pyrite up to 8 mm thick and in some cases pyrite cubes with truncated corners 5 - 13mm across can be found on the surface of the coating. Pyrite cubes up to 25 mm also occure in pyrite seams in the shale in close proximity to the concretions. Massive pyrite concreations up to 16 cm in diameter can also be found in the shale outcrops. More information about the deposits can be found in the following refernces:

www.dnr.state.oh.us/geosurvey/geo_fact/geo_f04.htm

Barth, V. D., 1975, Formation of concretions occurring in the Ohio shales along the Olentangy River: Ohio Journal of Science, v. 75, no. 3, p. 162-163.

Carlson, E. H., 1991, Minerals of Ohio: Ohio Division of Geological Survey Bulletin 69, 155 p. (concretions discussed on p. 17-24).

Clifton, H. E., 1957, The carbonate concretions of the Ohio Shale: Ohio Journal of Science, v. 57, no. 2, p. 114-124.

Criss, R. E., Cooke, G. A., and Day, S. D., 1988, An organic origin for the carbonate concretions of the Ohio Shale: U.S. Geological Survey Bulletin 1836, 21 p.

Feldmann, R. M., and McKenzie, Scott, 1981, Echinocaris multispinosis, a new echinocarid (Phyllocarida) from the Chagrin Formation (Late Devonian) of Ohio: Journal of Paleontology, v. 55, no. 2, p. 383-388.

Hansen, M. C., 1994, Concretions: the ludus helmontii of the Ohio Shale: Ohio Geology, Fall 1994, p. 1, 3-6.


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