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Savage, T. E., 1908 On the lower Paleozoic stratigraphy of southwestern Illinois: Am. Jour. Sci., v. 25, p. 431-443.

Savage, T. E., 1909, The Ordovician and Silurian formations in Alexander County, Illinois: Am. Jour. Sci., ser. 4, v. 28, p. 509-519.

Savage, T. E., 1920, Devonian formations of Illinois: Am. Jour. Sci., v. 49, p. 169-182.

Savage, T. E., 1925, Oriskany rocks in Illinois: Am. Jour. Sci., v. 10, p. 139-144.

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Schwalb, H. R., 1982, Paleozoic geology of the New Madrid area: U.S. Nuclear Regulatory Comm. Rept. NUREG/CR-2909, 61 p.

Schwalb, H. R., and Norris, Ronald, 1980a, Isopach map of Blocher Member of New Albany Shale, western Kentucky: Morgantown, W. Va., U.S. Dept. Energy, Morgantown Energy Technology Center, METC/EGSP Ser. No. 902 [1981].

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Shaver, R. H., 1974a, The Muscatatuck Group (new Middle Devonian name) in Indiana: Indiana Geol Survey Occasional Paper 3, 7 p.

Shaver, R. H., 1974b, The Niagaran (Middle Silurian) macro-faunas of northern Indiana C Review, appraisal, and inventory: Indiana Acad. Sci. Proc., v. 83, p. 301-315.

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Shaver, R. H., and Smith, S. G., 1974, Some Pennsylvanian kirbyacean ostracods of Indiana and midcontinent series terminology: Indiana Geol. Survey Rept. Prog. 31, 59 p.

Shaver, R. H., and Sunderman, J. A., 1983, Silurian reef and interreef strata as responses to a cyclical succession of environments, southern Great Lakes area (Field Trip 12), in Shaver, R. H., and Sunderman, J. A., eds., Field trips in midwestern geology: Bloomington, Ind., Geol. Soc. America, Indiana Geol. Survey, and Indiana Univ. Dept. Geology, v. 1, p. 141-196.

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Shaver, R. H., and others, 1970, Compendium of rock-unit stratigraphy in Indiana: Indiana Geol. Survey Bull. 43, 229 p.

Shaver, R. H., and others, 1971, Silurian and Devonian stratigraphy of the Michigan Basin C A view from the southwest flank, in Forsyth, J. L., Geology of the Lake Erie islands and adjacent shores: Michigan Basin Geol. Soc. Guidebook, p. 37-59.

Shaver, R. H., and others, 1978, The search for a Silurian reef model C Great Lakes area: Indiana Geol. Survey Spec. Rept. 15, 36 p.

Shaver, R. H., and others, 1985, Midwestern basins and arches region, in Lindberg, F. A., ed., Correlation of stratigraphic units of North America: Am. Assoc. Petroleum Geologists COSUNA Chad Ser.

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Shrock, R. R., and Malott, C. A., 1929, Structural features of West Frankin Formation of southwestern Indiana: Am. Assoc. Petroleum Geologists Bull., v. 13, p. 1301-1315.

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Siebenthal, C. E., 1901b, The Silver Creek Hydraulic Limestone of southeastern Indiana: Indiana Dept. Geology and Nat. Resources Ann. Rept 25, p. 331-389.

Smith, N. M., 1965, The Sanders Group and subjacent Muldraugh Formation (Mississippian) in Indiana: Indiana Geol. Survey Rept. Prog. 29, 20 p.

Smith, N. M., 1970, Lost River Chert, Salem Limestone, in Shaver, R. H., and others, Compendium of rock-unit stratigraphy in Indiana: Indiana Geol. Survey Bull. 43, p. 96-97 and 152-155.

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Sparling, D. R., 1984, Paleoecologic and paleogeographic factors in the distribution of lower Middle Devonian conodonts from north-central Ohio: Geol. Soc. America Spec. Paper 196, p. 113-125.

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Stith, D. A., 1979, Chemical composition, stratigraphy, and depositional environments of the Black River Group (Middle Ordovician), southwestern Ohio: Ohio Geol. Survey Rept. Inv. 113, 36 p.

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Stockdale, P. B., 1929b, Stratigraphic units of the Harrodsburg Limestone: Indiana Acad. Sci. Proc. for 1928, v. 38, p. 233-242.

Stockdale, P. B., 1931, The Borden (Knobstone) rocks of southern Indiana: Indiana Dept. Conserv. Pub. 98, 380 p.

Stockdale, P. B., 1939, Lower Mississippian rocks of east-central interior (U.S.): Geol. Soc. America Spec. Paper 22, 248 p.

Stumm, E. C., 1964, Silurian and Devonian corals of the Falls of the Ohio: Geol. Soc. America Mem. 93, 184 p.

Sullivan, D. M., 1972, Subsurface stratigraphy of the West Baden Group in Indiana: Indiana Geol. Survey Bull. 47, 31 p.

Sunderman, J. A., 1968, The geology and mineral resources of Washington County, Indiana: Indiana Geol. Survey Bull. 39, 90 p.

Sutherland, P. K., and Manger, W. L., eds., 1984, The Atokan Series (Pennsylvanian) and its boundaries C A symposium: Oklahoma Geol. Survey Bull. 136, 198 P.

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Sutton, A. H., 1944, The Devonian System in Indiana, in Symposium on Devonian stratigraphy: Illinois Geol. Survey Bull. 68, p. 162-173.

Sutton, A. H., and Weller, J. M., 1932 Lower Chester correlation in western Kentucky and Illinois: Jour. Geology, v. 40, p. 430-442.

Sutton, D. G., and Sutton, A. H., 1937, Middle Devonian of southern Indiana: Jour. Geology, v. 45, p. 320-331.

Swadley, W. C., 1963, Geology of the Flaherty Quadrangle, Kentucky: U.S. Geol. Survey Geol. Quad. Map GQ-229.

Swadley, W. C., and others, 1975, The Point Pleasant Tongue of the Clays Ferry Formation, northern Kentucky, in Cohee, G. V., and Wright, W. B., Changes in stratigraphic nomenclature by the U.S. Geological Survey: U.S. Geol. Survey Bull. 1405-A, p. A30-A31.

Swann, D. H., 1963 Classification of Genevievian and Chesterian (Late Mississippian) rocks of Illinois: Illinois Geol. Survey Rept. inv. 216, 91 p.

Swann, D. H., and Atherton, Elwood, 1948, Subsurface correlations of lower Chester strata of the Eastern Interior Basin: Jour. Geology, v. 56, p. 269-287.

Swann, D. H., and Willman, H. B., 1961, Megagroups in Illinois: Am. Assoc. Petroleum Geologists Bull., v. 46, p. 471-483.

Sweet, W. C., 1979 Conodonts and conodont biostratigraphy of post-Tyrone Ordovician rocks of the Cincinnatian region, in Pojeta, John, Jr., ed., Contributions to the Ordovician paleontology of Kentucky and nearby states: U.S. Geol. Survey Prof. Paper 1066-G, 26 p.

Sweet, W. C., and Bergstrom, S. M., 1971, The American Upper Ordovician standard C [Pt.] 13, A revised time-stratigraphic classification of North American upper Middle and Upper Ordovician rocks: Geol. Soc. America Bull., v. 82, p. 613-627.

Sweet, W. C., Ethington, R. L., and Barnes, C. R., 1971, North American Middle and Upper Ordovician conodont faunas: Geol. Soc. America Mem. 127, p. 163-193,

Templeton, J. S., and Willman, H. B., 1963, Champlainian Series (Middle Ordovician) in Illinois: Illinois Geol. Survey Bull. 89, 206 p.

Textoris, D. A., and Carozzi, A. V., 1964, Petrography and evolution of Niagaran (Silurian) reefs, Indiana: Am. Assoc. Petroleum Geologists Bull., v. 48, p. 397-426.

Thompson, M. L., and Shaver, R. H., 1964, Early Pennsylvanian microfaunas of the Illinois Basin: Illinois Acad. Sci. Trans., v. 67, no. 1, p. 1-23.

Thompson, M. L., Shaver, R. H., and Riggs, A. E., 1969, Early Pennsylvanian fusulinids and ostracods of the Illinois Basin: Jour. Paleontology, v. 33, p. 771-781.

Thornbury, W. D., and Deane, H. L., 1965 The geology of Miami County, Indiana: Indiana Geol. Survey Bull. 8, 49 p.

Thwaites, F. T., 1923 Paleozoic rocks found in deep wells in Wisconsin and northern Illinois: Jour. Geology, v. 31, p. 529-555.

Tillman, J. R., 1970, The age, stratigraphic relationships and correlation of the lower part of the Olentangy Shale of central Ohio: Ohio Jour. Sci., v.70, p. 202-217.

Tippie, F. E., 1948, Rosiclare-Fredonia contact in and adjacent to Hardin and Pope Counties, Illinois: Am. Assoc. Petroleum Geologists Bull., v. 29, p. 1654-1663.

Tollefson, L. J. S., 1979, Paleoenvironmental analysis of the Kokomo and Kenneth Limestone Members of the Salina Formation in the vicinity of Logansport, Indiana [M.S. thesis]: Urbana, Illinois Univ., 173 p.

Treworgy, C. G., 1981, The Seelyville coal C A major unexploited seam in Illinois: Illinois Geol. Survey Illinois Indus. Minerals Note 80, 11 p.

Trowbridge, A. C., and Atwater, G. I., 1934, Stratigraphic problems in the upper Mississippi Valley: Geol. Soc. America Bull., v. 45, p. 21-80.

Twenhofel, W. H., and others, 1964, Correlation of the Ordovician formations of North America: Geol. Soc. America Bull., v. 65, p. 247 298.

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Ulrich, E. O., 1911, Revision of the Paleozoic systems: Geol. Soc. America Bull., v. 22, p. 281 680. Ulrich, E. O., and Smith, W. S. T., 1908, The lead, zinc, and fluorspar deposits of western Kentucky: U.S. Geol. Survey Prof. Paper 36, 218 p.

Utgaard, John, and Perry, T. G., 1964, Trepostomatous bryozoan fauna of the upper part of the Whitewater Formation (Cincinnatian) of eastern Indiana and western Ohio: Indiana Geol. Survey Bull. 33, 111 p.