Fox Valley Member
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
Name
Original description
The Fox Valley Member of the Ironton Sandstone (Buschbach, 1964, p. 37).
Derivation
Named for the Fox River Valley.
Other names
History/background
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.
Lithology
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.
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
Age and correlation
Environments of deposition
Economic importance
Remarks
References
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 |
---|---|