Mindat Logo

Worthington area, Franklin Co., Ohio, USA

Worthington area, Franklin Co., Ohio, USA

Photo: 2005 S. Campbell
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:


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.

Mineral List


3 entries listed. 3 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
This page is currently not sponsored. To sponsor this page click here.

Mineral and/or Locality  
Search Google  
Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: December 19, 2014 09:24:57 Page generated: February 7, 2013 18:10:28
Mineral and Locality Search
and/or Locality:
Fade toolbar when not in focusFix toolbar to bottom of page
Hide Social Media Links
Slideshow frame delay seconds