Historical:Noix Oolite Member

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Handbook of Illinois Stratigraphy
Series Bulletin 95
Author H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date 1975
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Lithostratigraphy: Hunton Limestone Megagroup >>Edgewood Formation >>Noix Oolite Member
Chronostratigraphy: Paleozoic Erathem >>Silurian System >>Alexandrian Series
Allostratigraphy: Tippecanoe Sequence


H. B. Willman and Elwood Atherton

Name Origin

The Noix Oolite Member of the Edgewood Formation (Keyes, 1898, p. 59, 62) is named for exposures along Noix Creek near Louisiana, Pike County, Missouri.

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).

Stratigraphic Position

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


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