Age:

Pennsylvanian

Type designation:

Type locality: The Vigo Limestone Member was named as a part of the Shelburn Formation by Waddell (1954) for exposures along Prairie Creek near Vigo in Vigo County, Indiana (W½NW¼ sec. 28, T. 10 N., R. 10 W.) (Wier, 1970, 1986).

History of usage:

The Vigo Limestone Member was reassigned to the Patoka Formation when Wier (1970) redefined the Shelburn Formation (Wier, 1986).

Description:

The Vigo is a light- to dark-gray fossiliferous limestone with a few streaks of black carbonaceous limestone. It is thickest (2.5 ft; 0.8 m) in sec. 35, T. 9 N., R. 10 W., in southern Vigo County and is also fairly thick throughout much of its outcrop area in Sullivan County (Wier, 1970, 1986).

Distribution: It extends on outcrop and in the subsurface from northern Vigo County southward to the Ohio River (Wier, 1970, 1986).

Regional Indiana usage:

Illinois Basin (COSUNA 11)
Supergroup: none
Group: McLeansboro Group
Formation: Patoka Formation
Member: Vigo Limestone Member

Misc/Abandoned Names:

None

Geologic Map Unit Designation:

*pv

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:

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.

Waddell, Courtney, 1954, Geology and coal deposits of the Shelburn quadrangle, Sullivan County, Indiana: U. S. Geological Survey Coal Investigations Map C 17, scale 1:24,000.

Wier, C. E., 1970, Vigo Limestone 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. 184.

Wier, C. E., 1986, Vigo Limestone 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. 163.