Photograph Subject: Microphoto (X17) of St. Peter sand. from uppermost part of formation @ G. Sec. 86 (Cut on N. side State Highway 64, 1350' N. line. 2200' E. line Sec. 4, 23N, 10E, Ogle Co. ILL.) County: Ogle State: IL Author: Templeton, J. S. Volume: 2901 Format: Negative Ref ID: 2903