Marywood Member

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Lithostratigraphy: Knox Dolomite Megagroup >>Ironton Sandstone >>Marywood 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 Marywood Member of the Ironton Sandstone (Buschbach, 1964, p. 37).


Named for Marywood, Kane County.

Other names


Type section

Type location

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.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

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

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.




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