Fox Valley Member

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Lithostratigraphy: Knox Dolomite Megagroup >>Ironton Sandstone >>Fox Valley Member
Chronostratigraphy: Paleozoic Erathem >>Cambrian System >>Croixan Series >>Franconian Stage
Allostratigraphy: Sauk 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)

T. C. Buschbach


Original description

The Fox Valley Member of the Ironton Sandstone (Buschbach, 1964, p. 37).


Named for the Fox River Valley.

Other names


Type section

Type location

The type section of the Fox Valley Member of the Ironton Sandstone occurs at a depth of 1168-1180 feet in the same well as the Buelter type section.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The Fox Valley Member overlies the Buelter Member of the Ironton Sandstone.

Extent and thickness

The Fox Valley Member is commonly 10-25 feet thick.


It consists of poorly sorted medium- to coarse-grained sandstone that is consistently dolomitic. Dolomite occurs as cementing material and as stringers of light pink to buff sandy dolomite interbedded with the sandstone. Brown spheroids and oolites are present in the dolomite.




Well log characteristics


Age and correlation

Environments of deposition

Economic importance



BUSCHBACH, T. C., 1964, Cambrian and Ordovician strata of northeastern Illinois: Illinois State Geological Survey Report of Investigations 218, 90 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation