Who We Are
The Indiana Geological and Water Survey
The staff that works for IndianaThe Survey consists of a diverse group of scientists, specialists, and support staff dedicated to serving the earth science needs of the state of Indiana. They include research geologists in a variety of disciplines and specialists in cartography, GIS, database and web development, editing, and layout design, supported by an active business staff. The Survey is organized into three divisions: Research, Information Services, and Business Affairs.
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Employment OpportunitiesResearch Geologist (Reservoir/Hydro)
Water & Environment
Energy & Minerals
Water & Environment
Outreach & Education
IGSMap is the public source for geologic maps and data in Indiana. The Map Gallery helps people find commonly used maps and information for a better understanding of Indiana's geologic materials, resources, and issues.
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- Petroleum Database Management System
- New Albany Shale
- Colchester Coal Member
- Danville Coal Member
- Hymera Coal Member
- Seelyville Coal Member
- Springfield Coal Member
- Industrial Mineral Producers of Indiana
- Atlas of New Albany Shale Photomicrographs of Organic Matter
- Coal Mine Information System
- Coal Stratigraphic Database
- Outreach & Education
Type locality and use of name in Indiana: The Cohn Coal was introduced by Newton and Weller (1937, p. 18) for exposures in the NE¼ sec. 1, T.11 N., R.12 W., Clark County, Ill., 2 miles (3.2 km) southeast of Cohn (now called Livingston). This coal was later designated the Cohn Coal Member (Kosanke and others, 1960, p. 41) in Illinois. It was accepted by Wier (1961, 1965) as a member of the Mattoon Formation in Indiana.
Description: The Cohn Coal Member is 2 inches (< 0.1 m) thick in the type area and is 20 feet (6 m) above the top of the Livingston Limestone Member of the Bond Formation. It is underlain by 4 to 5 feet (1.2 to 1.5 m) of clay and overlain by a foot (0.3 m) of light-gray shale. The only known occurrence of the Cohn coal in Indiana is at Merom, Sullivan County (W2 sec. 7, T. 7 N., R. 10 W.), where it is more than a foot (> 0.3 m) thick and has been mined on a small scale.