Photograph Subject: Section in Penn. Series. (1) ss. Lenticular 6'0" pyrite ledge just below 1" at point of pick; (2) sh. Gray plastic clay 11'; (3) ss. Ls. Concretions-6"; (4) sh gray bluish, base below water 2'6" (3)+(4) not shown in photo County: Grundy State: IL Author: Culver,H. E. Volume: 0601 Format: Negative Ref ID: 0609