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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)== Elwood Atherton, Charles Collinson, and Jerry A. Lineback ==Name== ===Original description=== ===Derivation=== The St. Louis Limestone (Engelmann, 1847, p. 119-120; Ulrich, 1904, p. 103). ===Other names=== Named for St. Louis, Missouri, where it is extensively exposed. ===History/background=== ==Type section== ===Type location=== No type section was designated for the St. Louis Limestone. ===Type author(s)=== ===Type status=== ==Reference section== ===Reference location=== ===Reference author(s)=== ===Reference status=== ==Stratigraphic relationships== The St. Louis overlies the Salem Limestone except in the parts of western Illinois where it lies on the Warsaw Shale or the Sonora Formation. It is overlain by the Ste. Genevieve Limestone. The lower part of that formation grades laterally into the St. Louis Limestone, and in those places the formations are separated by a vertical cut-off. ==Extent and thickness== The St. Louis is typically exposed in Illinois in the Mississippi River bluffs at Alton, Madison County (Collinson et al., 1954) (fig. M-1B). It is also well exposed in the Mississippi and Illinois Valleys in western and southern Illinois (fig. M-1D) and along the Ohio River in Hardin County (fig. M-21). The St. Louis is 500 feet thick in southeastern Illinois and thins northwestward to less than 200 feet before being truncated by pre-Pennsylvanian erosion. <center> <gallery caption="" widths=250px heights=250px perrow=4> Figure M-1B.jpg|alt=Map showing distribution and outcrop areas of the St. Louis Limestone in Illinois (Figure M-1B)|{{file:Figure M-1B.jpg}} Figure M-1D.jpg|alt=Map illustrating regional exposure of the St. Louis Limestone in western and southern Illinois (Figure M-1D)|{{file:Figure M-1D.jpg}} Figure_M-21.jpg|alt=Geologic map or cross-section showing extent of the St. Louis Limestone along the Ohio River in Hardin County (Figure M-21)|{{file:Figure_M-21.jpg}} </gallery> </center> ==Lithology== The St. Louis Limestone in Illinois is characterized by fine-grained, micritic to lithographic, cherty limestone, but it contains beds of dolomite, crystalline limestone, fossiliferous limestone, and evaporites. The evaporites are represented in the outcrop areas by limestone breccias. The outcrop areas of the St. Louis are characterized by abundant sink holes. ==Core(s)== ==Photograph(s)== ==Contacts== ==Well log characteristics== ==Fossils== The rugose coral ''Lithostrotionella'' is common and characteristic (fig. M-4). In the St. Louis--Alton area the lower part of the St. Louis is included in the conodont ''Taphrognathus varians'' -- ''Apatognathus'' Zone and the upper part in the ''A. scalenus'' -- ''Cavusgnathus'' Zone. The upper St. Louis has common ''Eoendothyranopsis, Koninckopora pruvosti'', and large archaediscids. <center> <gallery caption="" widths=250px heights=250px perrow=4> Figure_M-4.jpg|alt=Fossil illustration showing Lithostrotionella coral and associated fossil assemblages characteristic of the St. Louis Limestone (Figure M-4)|{{file:Figure_M-4.jpg}} </gallery> </center> ==Age and correlation== ==Environments of deposition== ==Economic importance== “Westfield” and “Martinsville” are informal names applied to producing zones in the St. Louis Limestone. ==Remarks== ==References== COLLINSON, CHARLES, D. H. SWANN, and H. B. WILLMAN, 1954, Guide to the structure and Paleozoic stratigraphy along the Lincoln Fold in western Illinois: Illinois State Geological Survey Guidebook Series 3, 75 p.<br> ENGELMANN, GEORGE, 1947, Remarks on the St. Louis Limestone: American Journal of Science, v. 3, p. 119-120.<br> ULRICH, E. O., 1904, in E. R. Buckley and H. A. Buehler, Quarrying industry of Missouri: Missouri Bureau of Geology And Mines, v. 2, 371 p. {{Codes |membercode=5150 |geo_unit=Msl }}

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