United States, ILLINOIS, La Salle, Starved Rock State Park, west of South Ottawa; west of Hennepin Canyon, northwest quadrant of crossing of IL Rt. 71, south of lllinois River. Elev. 168-186 m (550-610 ft). Starved Rock 7.5 min. quad.
T. 33N, R. 2E, NW1/4 NE1/4 NE1/4 SECT. 26 and adjacent SECT. 23