Devonian and Mississippian
Type section: The name "Ellsworth Shale" was formally proposed by Newcombe (1933, p. 49-51) for 30 to 40 ft (9 to 12 m) of greenish-gray shale exposed in the Petoskey Portland Cement quarry in the NE¼NE¼ sec. 26, T. 32 N., R. 8 W., 12 miles (2.4 km) south of Ellsworth, Antrim County, Michigan.
A description of this stratigraphic term is being revised or developed, and is not available at this time.
Regional Indiana usage:
Illinois Basin (COSUNA 11)
Geologic Map Unit Designation:
MDe or MDnae
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.)
Bassett, J. L., and Hasenmueller, N. R., 1980, Map of Indiana showing thickness of the Ellsworth Member of the New Albany Shale (Devonian and Mississippian): Morgantown, W. Va., U.S. Department of Energy, Morgantown Energy Technology Center, METC\EGSP Series No. 810.
Cluff, R. M., Reinbold, M. L., and Lineback, J. A., 1981, The New Albany Shale Group of Illinois: Illinois State Geological Survey Circular 518, 83 p.
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, N. R., 1986, Ellsworth Shale, Ellsworth 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. 42-43.
Hasenmueller, N. R., and Bassett, J. L., 1981, Stratigraphy, in Hasenmueller, N. R., and Woodard, G. S., eds., Studies of the New Albany Shale (Devonian and Mississippian) and equivalent strata in Indiana: Indiana Geological Survey, p. 5-32.
Hasenmueller, N. R., Boberg, W. S., Lumm, C. B., Frankie, W. T., Hamilton-Smith, T., and Comer, J. B., 1994, Stratigraphy, in Hasenmueller, N. R., and Comer, J. B., eds., Gas potential of the New Albany Shale (Devonian and Mississippian) in the Illinois Basin: Indiana Geological Survey, Illinois Basin Consortium Illinois Basin Studies 2, p. 13-22.
Keller, S. J, and Burger, A. M., 1970, Ellsworth Shale, Ellsworth 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. 52-53.
Lechler, P. J., Hasenmueller, N. R., Bassett, J. L., and Leininger, R. K., 1979, Distribution and geochemical characterization of the Hannibal Member of the New Albany Shale in Indiana, in Third Eastern Gas Shales Symposium Proceedings: Morgantown, W. Va., U.S. Department of Energy METC\SP-79\6, p. 511-525.
Newcombe, R. B., 1932, Geology of Muskegon oil field, Muskegon, Michigan: American Association of Petroleum Geologists Bulletin, v. 16, p. 153-168.
Newcombe, R. B., 1933, Oil and gas fields in Michigan, a discussion of depositional and structural features of the Michigan Basin: Michigan Geological Survey Publication 38, Geol. ser. 32, xi + 293 p.
Sandberg, C. A., Hasenmueller, N. R., and Rexroad, C. B., 1994, Conodont biochronology, biostratigraphy, and biofacies of Upper Devonian part of New Albany Shale, Indiana: Courier-Forschungsinstitut Senckenberg, v. 168, p. 227-253.
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: June 27, 2017