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Lithostratigraphy
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Chronostratigraphy
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Allostratigraphy
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Hydrostratigraphy
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Primary source

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

Ste. Genevieve Limestone (Shumard, 1860, p. 406).

Derivation

Named for Ste. Genevieve, Missouri, where it is about 100 feet.

Other names

History/background

Type section

Type location

The type section of the Ste. Genevieve Limestone consists of outcrops in the bluffs along the Mississippi River 1-4 miles southeast of Ste. Genevieve.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The Ste. Genevieve overlies the St. Louis Limestone and underlies the Aux Vases Sandstone throughout much of the southern half of the Illinois Basin. The contact is placed below the lowest prominent oolitic bed. Near its western border the Ste. Genevieve has a conglomeratic bed at its base and rests unconformably on the eroded top of the St. Louis Limestone. Elsewhere the two formations appear to be conformable and, in the transition zone, beds with Ste. Genevieve lithology intertongue with beds with St. Louis lithology. The contact between the Ste. Genevieve and the overlying Aux Vases Sandstone is conformable, but it is marked by a series of downward steps to the west as the upper limestone beds grade westward into sandstone.

Extent and thickness

The Ste. Genevieve crops out from the vicinity of Alton, Madison County (fig. M-1B), south along the Mississippi Valley to Randolph County and from Union County, where it is about 300 feet thick, eastward across southern Illinois to Hardin County, where it averages about 250 feet thick (fig. M-22). The Ste. Genevieve Formation extends into eastern Missouri, southwestern Indiana, and western Kentucky. <center> {| class="wikitable" style="text-align: center;" |- |<gallery caption="" widths=250px heights=250px perrow=4> Figure M-1B.jpg|{{file:Figure M-1B.jpg}} Figure_M-22.jpg|{{file:Figure_M-22.jpg}} </gallery> |} </center>

Lithology

The Ste. Genevieve is generally light gray, but some beds of oolite (fig. M-1E) are nearly white. Chert is common and is generally gray, but in some places it is black. Thin beds of sandstone and sandy limestone, some traceable for many miles, occur mainly in the upper half of the formation. The sandstone is generally calcareous, light greenish gray, and very fine grained. A little shale, mainly dark greenish gray but locally red, purple, or green, occurs in the upper part of the formation. The Ste. Genevieve is subdivided into four members: the Fredonia Limestone Member at the base, the Spar Mountain Sandstone Member, the Karnak Limestone Member, and the Joppa Member (sandstone, limestone, dolomite, and shale). <center> {| class="wikitable" style="text-align: center;" |- |<gallery caption="" widths=250px heights=250px perrow=4> Figure M-1E.jpg|{{file:Figure M-1E.jpg}} </gallery> |} </center>

Core(s)

Photograph(s)

Contacts

Well log characteristics

Fossils

Weathered surfaces of the Ste. Genevieve generally show abundant fossils, mainly crinoid fragments. ''Platycrinites ("Platycrinus") penicillus'' and ''Pugnoides ottumwa'' are characteristic, although they occur rarely in older or younger strata. The Ste. Genevieve is in the lower part of the ''Gnathodus bilineatus'' -- ''Cavusgnathus charactus'' Zone (Collinson et al., 1971).

Age and correlation

The Pella beds of Iowa are correlated with the Ste. Genevieve.

Environments of deposition

Economic importance

“Ohara” is an informal name applied to producing zones in the [[Karnak Limestone Member]] of the Ste. Genevieve Limestone.<br> “Spar Mountain” or “Rosiclare” are informal names applied to producing zones in the [[Spar Mountain Sandstone Member]] of the Ste. Genevieve Limestone.<br> “McClosky”, “Oblong” and “lower McClosky” are informal names applied to producing zones in the [[Fredonia Limestone Member]] of the Ste. Genevieve Limestone.

Remarks

Reference(s)

place a <pre><br></pre>at the end of a line to get a line return COLLINSON, CHARLES, C. B. REXROAD, and T. L. THOMPSON, 1971, Conodont zonation of the North American Mississippian: Geological Society of America Memoir 127, p. 353-395; Illinois State Geological Survey Reprint 1972-A.<br> SHUMARD, B. F., 1860, Observations on the geology of the County of Ste. Genevieve: St. Louis Academy of Science Transactions, v. 1, p. 404-415.

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