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
TypeFormation
UnderliesLafferty Limestone in Arkansas and Moccasin Springs Formation in Illinois, Indiana, and Missouri
OverliesBrassfield Limestone in Arkansas and Sexton Creek Limestone in Illinois, Indiana, and Missouri
Lithology
PrimaryLimestone
Location
RegionArkansas, Illinois, Indiana, and Missouri
CountryUnited States
Type section
Named forSt. Clair spring, Independence County, Arkansas[1]
Named byRichard 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

[3]

Paleofauna

Brachiopods

Conodonts

Trilobites

See also

References

  1. 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.
  2. Schrenk, Steven (September 2017). "The Grey American Limestone that Acts Like a Marble". The Slippery Rock Gazette: 36, 37.
  3. "Saint Clair Linear | Polycor | Natural Stone | North America | Limestone". Polycor. Retrieved 2017-10-13.
  4. 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.
  5. 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.
  6. Holloway, David J. (January 1980). "Middle Silurian trilobites from Arkansas and Oklahoma, USA., Part I". Palaeontographica Abteilung A. 170: 1–85.
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