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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • St. Laurent formation, limestone
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
    • Sandstone
  • AAPG geologic province:
    • Ozark uplift
Publication:

Weller, Stuart, and St. Clair, S., 1928, Geology of Ste. Genevieve County, Missouri: Missouri Bureau of Geology and Mines Report, 2nd series, v. 22, 352 p.


Summary:

Named for St. Laurent Creek, Ste. Genevieve Co, MO, Ozark uplift, along which good exposures occur about 3 mi south of St. Marys. No type area designated. In Ste. Genevieve Co, St. Laurent occurs in three small outcrops within Little Saline faulted zone having a total area of less than 1/4 sq mi; also exposed in adjacent Perry Co, MO. St. Laurent has varying lithology though is predominately a hard and brittle, gray or blue-gray limestone; some beds are arenaceous limestone, sandstone, or chert. Thickness is 100-275 ft. Geologic map; measured section. Conformably overlies Beauvais formation (new); unconformably underlies Sulphur Springs formation. Stratigraphic chart. Fossils (listed) show strong affinity to formations of Hamilton (Middle Devonian) age in Ohio Valley and New York.

Source: GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • St. Laurent Formation
  • Modifications:
    • Revised
    • Overview
  • AAPG geologic province:
    • Ozark uplift
Publication:

Devera, J.A., and Fraunfelter, G.H., 1988, Middle Devonian paleogeography and tectonic relationships east of the Ozark dome, southeastern Missouri, southwestern Illinois and parts of southwestern Indiana and western Kentucky, IN McMillan, N.J., Embry, A.F., and Glass, D.J., eds., Devonian of the World; proceedings of the 2nd international symposium on the Devonian System; Volume II, Sedimentation: Canadian Society of Petroleum Geologists Memoir, 14, p. 179-196.


Summary:

Revised in that Beauvais Sandstone reduced to member rank and assigned to basal part of St. Laurent [not adopted by the Missouri Geol. Survey]. St. Laurent is confined to northwest-southeast outcrop belt in MO where it is exposed within Ste. Genevieve Fault Zone, Ozark uplift. Unconformably overlies Grand Tower Limestone; underlies Upper Devonian black shales. Maximum thickness is 85 m in St. Laurent Creek (type section), Perry Co, MO. Correlation chart. Based on correlation with Lingle Formation in IL, assigned late Eifelian and early Givetian (Middle Devonian) age.

Source: GNU records (USGS DDS-6; Denver GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).