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Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ==Contributing author(s)== Charles Collinson and Elwood Atherton ==Name== ===Original description=== The Cooper Limestone Member of the Grand Tower Limestone (Swallow, 1855, p. 108, 196). ===Derivation=== The Cooper is named for Cooper County, Missouri, where it is classified as a facies of the Calloway Limestone (Koenig, 1961). ===Other names=== ===History/background=== ==Type section== ===Type location=== ===Type author(s)=== ===Type status=== ==Reference section== ===Reference location=== ===Reference author(s)=== ===Reference status=== ==Stratigraphic relationships== On its northern margin the Cooper is overlapped by the Lingle Limestone, and on the south it grades laterally to the light-colored dolomite that overlies the Geneva Dolomite Member. ==Extent and thickness== In Illinois the Cooper Limestone Member is as much as 50 feet thick in a belt 60–90 miles wide that extends eastward across the state south of the Sangamon Arch (fig. D-14). It is exposed only in Calhoun County (Meents and Swann, 1965), where it previously was considered part of the Cedar Valley Limestone. <center> <gallery caption="" widths=250px heights=250px perrow=4> Figure_D-14.jpg|alt=Map showing distribution and thickness of the Cooper Limestone Member across southern Illinois (Figure D-14)|{{file:Figure_D-14.jpg}} </gallery> </center> ==Lithology== The Cooper Limestone Member is sparsely fossiliferous, gray, dense, lithographic, pure limestone, but it contains scattered grains of quartz sand in some localities. ==Core(s)== ==Photograph(s)== ==Contacts== ==Well log characteristics== ==Fossils== ==Age and correlation== The Cooper Limestone Member is similar to the Wapsipinicon Limestone north of the Sangamon Arch and probably is continuous with it west of Illinois. ==Environments of deposition== ==Economic importance== ==Remarks== ==References== KOENIG, J. W., 1961, Devonian System, in Stratigraphic succession in Missouri: Missouri Geological Survey, v. 40, p. 36-49.<br> MEENTS, W. F., and D. H. SWANN, 1965, Grand Tower Limestone (Devonian) of southern Illinois: Illinois State Geological Survey Circular 389, 34 p.<br> SWALLOW, G. C., 1855, Geology of Missouri: Missouri Geological Survey 2nd Annual Report, p. 59-170. {{Codes |membercode=6110 |geo_unit=-- }}

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