Historical:Fox Valley Member
T. C. Buschbach
The Fox Valley Member of the Ironton Sandstone (Buschbach, 1964, p. 37), which overlies the Buelter Member, is named for the Fox River Valley.
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.
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.
BUSCHBACH, T. C., 1964, Cambrian and Ordovician strata of northeastern Illinois: Illinois State Geological Survey Report of Investigations 218, 90 p.
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