U.S.A., Montana, Carter, Custer National Forest: Chalk Buttes: from the top of the South Chalk Butte, ca 0.5 air mi SE of Alstrom Spring, into Birch Spring Draw, and NE toward Hehn Draw, ca 0.5-2 air mi SW of Trenk Pass, ca 13.5 air mi SW of Ekalaka.
45.7239 -104.7117 NAD 83
45.7239° N, 104.7117° W; NAD 83, , GPS reading; T1S R57E S29; also SE1/4 S30, NE1/4 S31, and NW1/4 S32