United States, Illinois, La Salle, South Ottawa; northwest side of Illinois Route 71, excavated low area at southeast side of Illinois River opposite north end Mayo Island, 0.3 mile northeast of N 2650th Road, Ottawa 7.5 min. quadrangle. Coordinate Datum: WGS84/NAD83.
41.33006 -88.86508
T. 33N, R. 3E, center Sect. 15.
143 meters
470
Alkaline-salty silica sand over St. Peters Sandstone. Margin of calcareous-salty panne left after silica sand mining, seepage area, with Agropyron repens.; Occasional to infrequent succulent annual herb.