United States, Illinois, La Salle, Starved Rock State Park, west of South Ottawa; east branch Tonti Canyon; Starved Rock 7.5' quad. South Side IL Rt. 71, east side (west-facing slope), south of Illinois River
41.311056 -88.973417
41°18'39.8"N, 88°58'24.3"W
168-183 meters (551-600ft)
Mesic upland forest dominated by Acer saccharum
Moist, vertical sandstone outcrop, ledges, thin soil, St. Peter's Sandstone