Rapid City Skyline hogback sections 56A - First gully S of TV towers at Dinosaurs, measuring N from lowest exposures in the L2kote silt. wash 1 57.5 Siltstone, fine, massive, gray to purplish-gray, hzd with subconch. trecture, curb frags & local sandy zones. Weathers white. 2 15.5 Clzystone, with zones massive siltstone in bsszl 5.0t Bzzzl 2.5t dk gray clays tone above which 20" purplish gray white-weth massive clayey siltbed capped by 10 Fe yellow burn layers, of bedded silt & very fine ss. Reminder is dk gray wevy, slightly silty clzystone becoming purplish gray near top and, in upper 1.7t is zone red clzystone. Break up- 3 2.7 Clzystone, wavy, similar to unit below with which it is continuous, but light green in color. 4 6.0 Sandstone, fine-grained to very finegr with ferruginous matter in irreg 3