Age:

Pennsylvanian

Type designation:

Type section: The name “Inglefield Sandstone” was used by Fuller and Ashley (1902, p. 3) for 80 to 100 ft (24 to 30 m) of sandstone exposed in a railroad cut in the SW¼NW¼ and SE¼NW¼ sec. 8, T. 5 S., R. 10 W., near Inglefield in northern Vanderburgh County, Indiana (Wier and Ault, 1986).

History of usage:

The name was changed to "Inglefield Formation" by Fuller and Clapp (1904), who included in the formation the sandstone in the Inglefield railroad cut and all of the rocks above to the base of the Parker Coal Member (Wier and Ault, 1986).

The name “Inglefield” was restricted to the sandstone above the Ditney Coal Member and below the Hazelton Bridge Coal Member and assigned the unit member rank in the Patoka Formation (Wier, 1970). Wier (1970) retained the type section of Fuller and Ashley (1902) (Wier and Ault, 1986).

Description:

The Inglefield Sandstone Member is a sandstone that is gray to tan, fine grained, thin to thick bedded, and cross bedded (Wier and Ault, 1986). The Inglefield grades laterally into a sandy shale. The sandstone is thickest in Vanderburgh and Posey Counties (Wier, 1970; Wier and Ault, 1986). Gray (2011, p. 3) reported that where the Inglefield is present in Posey County its thickness ranges from 7 to 138 ft (2 to 42 m); it commonly is about 60 ft (18 m) thick. North of Knox County the sandstone rarely is thicker than 20 ft (6 m) (Wier, 1970; Wier and Ault, 1986).

Correlations:

The Inglefield Sandstone Member is also recognized in Illinois, where Andresen (1961) assigned it to the Modesto Formation (Wier and Ault, 1986). In 2001, the Modesto Formation was assigned the name "Patoka Formation" by The Tri-State Committee on Correlation of the Pennsylvanian System in the Illinois Basin.

Regional Indiana usage:

Illinois Basin (COSUNA 11)
Supergroup: none
Group: McLeansboro Group
Formation: Patoka Formation
Member: Inglefield Sandstone Member

Misc/Abandoned Names:

None

Geologic Map Unit Designation:

*pi

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.)

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

Major tectonic features that affect bedrock geology in Indiana.

References:

Andresen, M. J., 1961, Geology and petrology of the Trivoli Sandstone in the Illinois Basin: Illinois State Geological Survey Circular 316, 31 p.

Fuller, M. L., and Ashley, G. H., 1902, Description of the Ditney quadrangle: U.S. Geological Survey Geologic Atlas, Folio 84, 8 p.

Fuller, M. L., and Clapp, F. G., 1904, Description of the Patoka quadrangle: U.S. Geological Survey Geologic Atlas, Folio 105, 12 p.

Gray, H. H., 2011, Stratigraphy of the West Franklin Limestone Member (Pennsylvanian) in Posey County, Indiana: Indiana Geological Survey Special Report 70, 15 p.

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

Shaver, R. H., coordinator, 1984, Midwestern basin and arches region–correlation of stratigraphic units in North America (COSUNA): American Association of Petroleum Geologists Correlation Chart Series.

The Tri-State Committee on Correlation of the Pennsylvanian System in the Illinois Basin, 2001, Toward a more uniform stratigraphic nomenclature for rock units (formations and groups) of the Pennsylvanian System in the Illinois Basin: Indiana Geological Survey, Illinois Basin Consortium Illinois Basin Studies 5, 26 p.

Wier, C. E., 1970, Inglefield Sandstone Member, in Shaver, R. H., Burger, A. M., Gates, G. R., Gray, H. H., Hutchison, H. C., Keller, S. J., Patton, J. B., Rexroad, C. B., Smith, N. M., Wayne, W. J., and Wier, C. E., Compendium of rock-unit stratigraphy in Indiana: Indiana Geological Survey Bulletin 43, p. 75–76.

Wier, C. E., and Ault, C. H., 1986, Inglefield Sandstone Member, in Shaver, R. H., Ault, C. H., Burger, A. M., Carr, D. D., Droste, J. B., Eggert, D. L., Gray, H. H., Harper, Denver, Hasenmueller, N. R., Hasenmueller, W. A., Horowitz, A. S., Hutchison, H. C., Keith, B. D., Keller, S. J., Patton, J. B., Rexroad, C. B., and Wier, C. E., Compendium of Paleozoic rock-unit stratigraphy in Indiana–a revision: Indiana Geological Survey Bulletin 59, p. 62–63.