Loc. 48 Badlands in NW-facing bluffs south of Hump Creek in N1/2, NW 1/4, SE 1/4, sec. 31, T. 21 N., R. 23 E., Black Horse NE quad., Corson Co., S. D. One mile E of S.D. route 65 Excellent exposures of lower Hell Creek, part of upper Hell Creek and - in gullies at foot of bluff, contact with Fox Hills. In mud butte in center NE 1/4 NW1/4 SE 1/4 sec. 31, banded beds overlie massive buff-gray weathering, friable sands stone shot with Helymenites and containing the Tancredia fauna. This sand is 10' or more thick with spectacular exposure of Helymenites. Contact with overlying banded beds marked by thin shaly limonitic concretionary material that is bright OR on outcrop. Banded beds of sandy clays (?-not investigated) are overlain by massive sandy clays (?) weathering to fluted outcrop. Mn concretions, fossil wood and bone fragments litter banded slopes which weather to bzl-land fluted topay, Not known from what part section fossils come. Sharpest lithologic break at top of Helymenites sand. This is presumed to be contact 30