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 section: The Pirtle Coal Member of the Shelburn Formation was named by Wier (1961, 1965) for exposures of Ashley's (1899) Coal VIIa near the Pirtle Cemetery in secs. 15 and 27, T. 8 N., R. 8 W., Sullivan County, Ind. The type section is in the SE¼SE¼SW¼ sec. 15, T. 7 N., R. 8 W.
Description: The Pirtle Coal Member is thickest in Sullivan County and in northern Knox County, where the coal is bright banded and shaly in places. It averages 1 to 1.5 feet (0.3 to 0.5 m) in thickness and lies more than 60 feet (18 m) above the Danville Coal Member of the Dugger Formation. The Pirtle coal is very thin in Vigo and Vermillion Counties or is absent. It is seen in few places in outcrop in Gibson and Posey Counties but may not be recognized on many geophysical logs because of its thinness.