The self-guided geology drive covers about 20 miles and seven stops, with a 60-to-90-minute estimate for the outing. For this stop, park at Wind Cave Canyon trailhead, 3.9 miles north on US 385, then walk about one mile round trip to the outcrop. The canyon route is a gravel service road with uneven ground and occasional steep grades; visitor vehicles do not continue past the trailhead. Pick up the printed stop guide and geologic timeline at the visitor center, and fuel up before the drive—there’s no gas sold in the park.