W - 24 Breoch of Pine Ridge - Oil Butte outline N side Keyhole Reservoir in d to W of gulley running E thru about center swly sec 20, T.51 N, R66 W, Carlile quadj. At crest of ledge approx topc measurement + headlevel of SS shows 75' ledge to grass roots below, and 17' platy wash SS above ledge. All of which is Lzkote. Near massive ledge base not far above green gray Morrison. Along ridge N of crest ledgu broken up by leasuing out of some of SS channels into softer beds, In gulley, headtracing up slope along strike (N 14 W 22 E) it is 16' from top Lzkote study section to the contact, and 10.5 ft from contact into lower FR SS, which only creps out in plat locally. The contact is sharp 1.0-? Blzclr silty shale, lb siltst 0.2+ Siltstone, gray, x-lzm, czvb frags 25