Lithostratigraphy: Knox Dolomite Megagroup >>Ironton Sandstone >>Buelter Member
Chronostratigraphy: Paleozoic Erathem >>Cambrian System >>Croixan Series >>Franconian Stage
Allostratigraphy: Sauk Sequence
T. C. Buschbach
The Buelter Member of the Ironton Sandstone (Buschbach, 1964, p. 36), the basal member, is named for Buelter School, Kane County.
The type section of the Buelter Member is located 2 miles west of Buelter School, Kane County, and is at a depth of 1180-1230 feet in Batavia city well No. 3 (SE SW NE 22, 39N-8E) (sample set 6901).
Extent and Thickness
It is widely present in northern Illinois, where it is 20-80 feet thick.
It is dominantly medium-grained, moderately well sorted, rarely dolomitic sandstone. The contact with the underlying fine-grained, well sorted sandstone of the Galesville is generally sharp.
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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