Lithostratigraphy: Knox Dolomite Megagroup >>Ironton Sandstone >>Marywood Member
Chronostratigraphy: Paleozoic Erathem >>Cambrian System >>Croixan Series >>Franconian Stage
Allostratigraphy: Sauk Sequence
T. C. Buschbach
The Marywood Member of the Ironton Sandstone (Buschbach, 1964, p. 37), which overlies the Fox Valley Member, is named for Marywood, Kane County.
The type section of the Marywood Member is located 4 miles north of Marywood, Kane County, at a depth of 1120-1168 feet in the same well as the Buelter type section.
Extent and Thickness
The Marywood Member appears to be as widespread as the other members, but in some areas it is not readily separated from the units above and below. It is 10-50 feet thick.
The Marywood Member consists of sandstone that is finer grained and less dolomitic than the units above and below.
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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