Type locality: The Renault Limestone was named by Stuart Weller (1913, p. 120, 122) for exposures in Renault Township, Monroe County, Illinois, but he designated no type section (Burger, 1970; Carr and Gray, 1986).
History of usage:
As presently defined in Illinois, the Renault Limestone is commonly about 8 ft (2.4 m) thick (Atherton and others, 1975, p. 144) and consists of two members, a lower, relatively pure limestone (Levias Limestone Member) and an upper sandy limestone (Shetlerville Limestone Member) (Carr and Gray, 1986).
In Indiana, the Renault Member is a light- to medium-gray or brown wackestone and mudstone interbedded with thin gray to greenish-gray calcareous and fossiliferous shale (Droste and Carpenter, 1990). Biofragmental and oolitic packstone lenses are moderately abundant (Droste and Carpenter, 1990). Droste and Carpenter (1990) note that in Gibson and Posey Counties in southwestern Indiana a few of the limestones are slightly to very dolomitic, and fine-grained sandstone lenses are found near the middle of the unit. The member ranges from less than 10 ft (3 m) in the north to a maximum of 26 ft (7.9 m) in Posey County (Droste and Carpenter, 1990, p. 33, fig. 22).
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 featuers in Indiana.
Major tectonic features that affect bedrock geology in Indiana.
Atherton, Elwood, Collinson, Charles, and Lineback, J. A., 1975, Mississippian System, in Willman, H. B., Atherton, Elwood, Buschbach, T. C., Collinson, Charles, Frye, J. C., Hopkins, M. E., Lineback, J. A., and Simon, J. A., Handbook of Illinois stratigraphy: Illinois State Geological Survey Bulletin 95, p. 123-163.
Burger, A. M., 1970, Renault Formation, 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. 139-140.
Carr, D. D., and Gray, H. H., 1986, Renault Formation, 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. 123-124.
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.
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.
Swann, D. H., 1963, Classification of Genevievian and Chesterian (Late Mississippian) rocks of Illinois: Illinois State Geological Survey Report of Investigations 216, 91 p.
Weller, Stuart, 1913, Stratigraphy of the Chester Group in southwestern Illinois: Illinois State Academy of Science Transactions, v. 6, p. 118-129.
For additional information, contact:
Nancy Hasenmueller (email@example.com)Date last revised: April 5, 2017