Type locality: The name “St. Meinrad Coal” was given by Franklin and Wanless (1944, p. 87-88) to the coal mined near St. Meinrad, Spencer County, Indiana, but no specific type section or other exposure was stated (Hutchison, 1970; Hasenmueller and Hutchison, 1986). This coal lies stratigraphically 160 to 180 ft (49 to 55 m) below the top of the Mansfield Formation (Hutchison, 1970; Hasenmueller and Hutchison, 1986).
History of usage:
The lithostratigraphic rank assigned to the St. Meinrad has been considered variably to be formation (Franklin and Wanless, 1944), bed (in the Mansfield Formation; Hutchison, 1971), and member (in the Mansfield Formation; Hutchison, 1971) (Hasenmueller and Hutchison, 1986).
The St. Meinrad Coal Member consists of moderately bright and clean coal that is semiblocky and that ranges from less than 0.1 ft (0.03 m) to more than 5.0 ft (1.5 m) in thickness and averages about 4.0 ft (1.2 m) where mined (Hutchison, 1970; Hasenmueller and Hutchison, 1986). The roof of the coal is commonly shale and less commonly sandy shale, sandstone, dark-gray fissile carbonaceous shale, or tan to gray massive medium-grained sandstone (Hasenmueller and Hutchison, 1986). The floor is gray sandy carbonaceous underclay or shale (Hutchison, 1970; Hasenmueller and Hutchison, 1986). The coal contains an inorganic parting throughout much of its extent in Perry County (Hutchison, 1971), and in places the upper few inches of the seam is a bone coal (Hutchison, 1970; Hasenmueller and Hutchison, 1986).
The St. Meinrad has been correlated with the No. 1b Coal (Bell Coal Bed) of western Kentucky (Peppers and Popp, 1979, p. 67 and 69, fig. 3; Williams, Williamson, and Beard, 1982, p. 10-11, fig. 8) and with both the Bell Coal Bed (Peppers and Popp, 1979, p. 67 and 69, fig. 3) and the Reynoldsburg Coal Member (Williams, Williamson, and Beard, 1982, p. 10-11, fig. 8) of Illinois (Hasenmueller and Hutchison, 1986).
Regional Indiana usage:
Illinois Basin (COSUNA 11)
Coal II, Lower Cannelton Coal, Upper Cannelton Coal, Upper Troy Coal
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.)
Ashley, G. H., 1899, The coal deposits of Indiana: Indiana Department of Geology and Natural Resources Annual Report 23, p. 1-1,573.
Franklin, D. W., 1939, Lithologic and stratigraphic study of the Lower Pennsylvanian strata, Orange County, Indiana: Urbana, University of Illinois, master's thesis, 49 p.
Franklin, D. W., and Wanless, H. R., 1944, Pennsylvanian stratigraphy of part of southern Indiana: Illinois State Academy of Science Transactions, v. 37, p. 85-92.
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.
Hasenmueller, W. A., and Hutchison, H. C., 1986, St. Meinrad Coal 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. 126-127.
Hutchison, H. C., 1970, St. Meinrad Coal Bed, 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. 147-148.
Peppers, R. A., and Popp, J. T., 1979, Stratigraphy of the lower part of the Pennsylvanian System in southeastern Illinois and adjacent portions of Indiana and Kentucky, in Palmer, J. E., and Dutcher, R. R., eds., Depositional and structural history of the Pennsylvanian System of the Illinois Basin–Pt. 2, Invited papers, Ninth International Congress Carboniferous Stratigraphy and Geology, Illinois Geological Survey Guidebook Series 15a, p. 65-72.
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.
Williams, D. A., Williamson, A. D., and Beard, J. G., 1982, Stratigraphic framework of coal-bearing rocks in the Western Kentucky Coal Field: Kentucky Geological Survey Information Circular 8, 201 p.
For additional information contact:
Nancy Hasenmueller (email@example.com)Date last revised: December 4, 2017