(IL-84-10) SE of Rochester, Cotton Hill Township, Sangamon County, IL. IL29 (Springfield Rd.) SE 4.9 miles from jct with Main St. in Rochester, S. on Jett Rd. 1.6 miles, W. on E2300N 1.4 miles to the crib on the N. side of the road. (N39 41.082 W89 29.302) Photo 9-11-07.