Noix Oolite Member

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Lithostratigraphy: Hunton Limestone Megagroup >>Edgewood Formation >>Noix Oolite Member
Chronostratigraphy: Paleozoic Erathem >>Silurian System >>Alexandrian Series
Allostratigraphy: Tippecanoe Sequence

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)

H. B. Willman and Elwood Atherton


Original description

The Noix Oolite Member of the Edgewood Formation (Keyes, 1898, p. 59, 62).


Named for exposures along Noix Creek near Louisiana, Pike County, Missouri.

Other names


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Stratigraphic relationships

The Noix Oolite Member is generally at or close to the base of the Edgewood Formation but is lenticular and absent in some areas.

Extent and thickness

The Noix Oolite Member is commonly is 1.5-3.5 feet thick in western Illinois (Rubey, 1952), and it is as much as 2 feet thick in southern Illinois (Pryor and Ross, 1962).





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Age and correlation

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Economic importance



KEYES, C. R., 1898, Some geological formations of the Capau-Gres uplift: Iowa Academy of Science Proceedings, v. 5, p. 58-63.
PRYOR, W. A., and C. A. ROSS, 1962, Geology of the Illinois parts of the Cairo, La Center, and Thebes Quadrangles: Illinois State Geological Survey Circular 332, 39 p.
RUBEY, W. W., 1952, Geology and mineral resources of the Hardin and Brussels Quadrangles: USGS Professional Paper 218, 179 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation