The Baylis Formation is made up of two distinct members: the lower Hadley Gravel Member and the upper, sandy Kiser Creek Member.
What is the age/age range of the Baylis Formation of southern Illinois?
What is its depositional history?
What other formation(s)/member(s) does it correlate to?
Are there any notable/index fossils found within?
ANDREWS, G. W., 1958, Windrow Formation of Upper Mississippi Valley region: Journal of Geology, v. 66, p. 597-624.
FRYE, J. C., H. B. WILLMAN, and H. D. GLASS, 1964, Cretaceous deposits and the Illinoian glacial boundary in western Illinois: Illinois State Geological Survey Circular 364, 28 p