Type area: The Bailey Limestone was named for exposures of argillaceous limestones and shales along the Mississippi River between Bailey's Landing and Red Rock Landing in Perry County, Missouri (E. O. Ulrich, as published by Buckley and Buehler, 1904, p. 110).
History of usage:
Extended: Collinson and others (1967, p. 940) delineated the general distribution of the Bailey in the Illinois Basin (Droste and Shaver, 1986).
The Bailey Limestone consists of drab, neutrally colored limestones and some dark-gray limestone (Droste and Shaver, 1986). They are mostly very fine grained, somewhat cherty, and slightly dolomitic (Droste and Shaver, 1986).
The bottom part of the Bailey Limestone is lithologically transitional to the Moccasin Springs Formation below, but the conformable contact is placed at the top of the blackish dense dolomitic shale and dark greenish-gray limestone of the Moccasin Springs (Droste and Shaver, 1986). The top of the Bailey is placed at the base of the whitish granular bioclastic Backbone Limestone (Droste and Shaver, 1986). This contact appears to be conformable in deeper basin areas but may be unconformable in the more distal basin area (Droste and Shaver, 1986). Middle Devonian rocks unconformably overlie the Bailey in a small part of its area of occurrence (Droste and Shaver, 1986).
Like all the formations in the Bainbridge Group, some diachroneity along contacts may apply to the basin-to-shelf relationships among these rocks as well as to the equivalent section eastward ranging upward from the Salamonie Dolomite and culminating in the Wabash Formation (Droste and Shaver, 1986). These general statements on correlation may be made, however: The Bailey of Indiana has coextension with the Bailey in the Illinois Basin parts of Illinois and Kentucky (Droste and Shaver, 1986). In Illinois, the highest Bailey rocks as generally defined there are Devonian in age and therefore are younger than the Bailey of Indiana. In Kentucky, an equivalent of the lower Bailey of Indiana is called the Decatur Limestone (Droste and Shaver, 1986). Northeastward in Indiana and northward and some westward in Illinois, upper Wabash rocks (Kokomo, Kenneth, and Liston Creek Members) and upper Racine rocks respectively are correlative of the Bailey of Indiana (Droste and Shaver, 1986).
Regional Indiana usage:
Illinois Basin (COSUNA 11)
Geologic Map Unit Designation:
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.
Buckley, E. R., and Buehler, H. A., 1904, Quarrying industry of Missouri: Missouri Bureau of Geology and Mines, 2nd Series, v. 2, 371 p.
Collinson, Charles, James, G. W., Swann, D. H., Becker, L. E., Carlson, M. P., Dorheim, F. H., and Koenig, J. W., 1967, Devonian of north-central region, United States, in International symposium on the Devonian System: Alberta Society of Petroleum Geologists, v. 1, p. 933-971.
Droste, J. B., and Shaver, R. H., 1986, Bailey Limestone, 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. 8-9.
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.
Schwalb, H. R., 1975, Oil and gas in Butler County, Kentucky: Kentucky Geological Survey, ser. 10, Report of Investigations 16, 65 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.
For additional information, contact:
Nancy Hasenmueller (email@example.com)Date last revised: November 22, 2016