Inside of parabolic blow-out dune, Great Sand Hills area in sec. 29, T. 16, R. 21, W. 3. Notice the gentle depositional slope along central axis to left, steep erosional slopes on side of U.
Rills cut into wall of Cypress Hills gravels, located between ridges of gravel due to bulldozing on top. Notice resemblance to jointing. Two persons on top.
Rills cut into wall of Cypress Hills gravels, located between ridges of gravel due to bulldozing. View of the bull-dozed ridges on top. Stu Jordan in picture.