IGNIS
Tioga Bentonite Bed

Age:

Devonian

Type designation:

Type section: The altered volcanic ash that was noted by Fettke (1931, p. 8) in the Tioga Gas Field of Pennsylvania was named the Tioga Bentonite by Ebright, Fettke, and Ingham (1949, p. 10) (Droste and Shaver, 1986).

Reference section: Becker (1974, p. 39-43) designated rocks cored at 4,056 ft (1,237 m) in the Superior No. 1 Comm. Braselton well (Indiana Geological Survey Petroleum Database Management System No. 129842), Gibson County, Indiana (sec. 24, T. 2 S., R. 12 W.) as an Indiana reference section (Droste and Shaver, 1986).

Description:

View description from:
Compendium of Paleozoic Rock-Unit
Stratigraphy in Indiana
(1986)

Regional Indiana usage:

Illinois Basin (COSUNA 11)
Supergroup: none
Group: Muscatatuck Group
Formation: Jeffersonville Limestone
Member: Vernon Fork Member
Bed: Tioga Bentonite Bed
Illinois Basin Margin (COSUNA 12)
Supergroup: none
Group: Muscatatuck Group
Formation: Jeffersonville Limestone
Member: Vernon Fork Member
Bed: Tioga Bentonite Bed
Cincinnati Arch (COSUNA 13)
Supergroup: none
Group: Muscatatuck Group
Formation: Jeffersonville Limestone
Member: Vernon Fork Member
Bed: Tioga Bentonite Bed
Kankakee Arch (COSUNA 14)
Supergroup: none
Group: Muscatatuck Group
Formation: Jeffersonville Limestone
Member: Vernon Fork Member
Bed: Tioga Bentonite Bed
Kankakee Arch (COSUNA 14)
Supergroup: none
Group: Muscatatuck Group
Formation: Detroit River Formation
Member: Cranberry Marsh Member
Bed: Tioga Bentonite Bed
Michigan Basin (COSUNA 15)
Supergroup: none
Group: Muscatatuck Group
Formation: Detroit River Formation
Member: Cranberry Marsh Member
Bed: Tioga Bentonite Bed

Misc/Abandoned Names:

Onondaga Indian Nation Bentonite

Geologic Map Unit Designation:

Djtb

Note: Hansen (1991, p. 52) in Suggestions to authors of the reports of the United States Geological Survey noted that letter symbols for map units are considered to be unique to each geologic map and that adjacent maps do not necessarily need to use the same symbols for the same map unit. Therefore, map unit abbreviations in the Indiana Geologic Names Information System should be regarded simply as recommendations.

COSUNA areas and regional terminology

Names for geologic units vary across Indiana. The Midwestern Basin and Arches Region COSUNA chart (Shaver, 1984) was developed to strategically document such variations in terminology. The geologic map (below left) is derived from this chart and provides an index to the five defined COSUNA regions in Indiana. The regions are generally based on regional bedrock outcrop patterns and major structural features in Indiana. (Click the maps below to view more detailed maps of COSUNA regions and major structural features in Indiana.)

Map showing the COSUNA areas (heavy black line) that approximate regional bedrock outcrop patterns and major structural features in Indiana, and the COSUNA numbers (large bold font) for these areas. The COSUNA boundaries are limited to state and county boundaries that facilitate coding.

COSUNA areas and numbers that approximate regional bedrock outcrop patterns and major structural features in Indiana.

Map showing major tectonic features that affect bedrock geology in Indiana.

Major tectonic features that affect bedrock geology in Indiana.

References:

Hansen, W. R., 1991, Suggestions to authors of the reports of the United States Geological Survey (7th ed.): Washington, D.C., U.S. Geological Survey, 289 p.



For additional information contact:

Nancy Hasenmueller (hasenmue@indiana.edu)
Date last revised: June 14, 2017

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