F. Caspall, W. A. DiMichele, D. Hess, K. Ifekoya, R. Leary, W. J. Nelson, C. McCormack, W. McCracken, and R. Peppers. 1990. Floral community variation in basal Pennsylvanian strata overlying paleokarst on mid-Mississippian age St. Louis Limestone, McClure Quarry, Tennessee, McDonough County, Illinois. North-central Section, Geological Society of America, Abstracts with Programs 22(5):5 [H. Sims/S. Ostrowski/M. Uhen]