St. Clair Limestone
The St. Clair Limestone is a geologic formation in Arkansas, Indiana, Missouri, and Oklahoma. It preserves fossils dating back to the Silurian period. This high density, high magnesium dolomitic limestone[2] was originally classified as a marble in Oklahoma due to the fact that it would hold a high polish, hence Marble City.
| St. Clair Limestone | |
|---|---|
| Stratigraphic range: Silurian | |
| Type | Formation |
| Underlies | Lafferty Limestone in Arkansas and Moccasin Springs Formation in Illinois, Indiana, and Missouri |
| Overlies | Brassfield Limestone in Arkansas and Sexton Creek Limestone in Illinois, Indiana, and Missouri |
| Lithology | |
| Primary | Limestone |
| Location | |
| Region | Arkansas, Illinois, Indiana, and Missouri |
| Country | United States |
| Type section | |
| Named for | St. Clair spring, Independence County, Arkansas[1] |
| Named by | Richard Alexander Fullerton Penrose Jr. |
Physical characteristics
| Imperial | Metric | ||
|---|---|---|---|
| Absorption by weight | ASTM C97 | 0.5% | 0.5% |
| Density | ASTM C97 | 168 lb/ft3 | 2 691.10 kg/m3 |
| Compressive strength | ASTM C170 | 15 889Psi | 109.55MPa |
| Modulus of rupture | ASTM C99 | 972Psi | 6.70MPa |
Paleofauna
Brachiopods
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Conodonts
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Trilobites
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References
- Penrose Jr., R.A.F. (1891). "Manganese: its uses, ores, and deposits". Annual Report of the Geological Survey of Arkansas for 1890. 1: 101–102, 112–114, 124–128, 166–203, 214–215.
- Schrenk, Steven (September 2017). "The Grey American Limestone that Acts Like a Marble". The Slippery Rock Gazette: 36, 37.
- "Saint Clair Linear | Polycor | Natural Stone | North America | Limestone". Polycor. Retrieved 2017-10-13.
- Amsden, Thomas W. (1968). "Articulate Brachiopods of the St. Clair Limestone (Silurian), Arkansas, and the Clarita Formation (Silurian), Oklahoma". Memoir (The Paleontological Society). 1: i–117. JSTOR 1315506.
- Craig, William (1968). The stratigraphy and conodont paleontology of Ordovician and Silurian strata, Batesville district, Independence and Izard counties, Arkansas (PhD). The University of Texas.
- Holloway, David J. (January 1980). "Middle Silurian trilobites from Arkansas and Oklahoma, USA., Part I". Palaeontographica Abteilung A. 170: 1–85.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
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