United States, Illinois, Williamson, T8S R2E along north edges of NW1/4 and NE1/4 NE1/4 SW1/4 Sect. 20. Along north side of abandoned railroad grade (and powerline right-of-way), south side of East Herrin Road. Eastern corporate limits of Herrin. Herrin 7.5 min quadrangle.
37˚48'40"N Lat 089˚00'50"W Long