(Martian) NE of Monroe, Frenchtown Township, Monroe County, MI. Nadeau Rd. E. 0.6 miles from jct with I75 exit 18 N. of Monroe, N. on Mentel Rd. 0.25 miles, SE on Stony Creek Rd. 0.0 miles to the carving on the SW side of the road. (N41 57.619 W83 19.383) Photo by Mark & Gordie Comstock 3-24-21.