U.S.A., South Dakota, Harding, Custer National Forest: Slim Buttes: in the vicinity of Willard Gap off of Rimrock Trail or Forest Road 3150, ca 3 air mi ESE of Summit Pass on SD Hwy 79 and ca 26.5 air mi SE of Buffalo.
45.352 -103.1077 NAD 83
45.352° N, 103.1077° W; NAD 83, , GPS reading; T16N R8E S14 N1/2