7/13/78 7823 Type sect. of Colgate Mbr. at Colgate siding NW 1/4, NE 1/4 Sec. 15, T 15 N, R 55 E Glendive Quad. Dawson Co., Mont Colgate mbr Vfg clayey, very lt grey clayey ss, minor iron staining. Indistinct bedding. Few poor pl. remains, sticks, white ledges. Forms high standing white cliff 20' Colgate Mbr. Hell Creek fm Basal 60' a brownish tan friable med to vfg ss, w salt & pepper aspect toward top H.C. becomes more shaley w/ mudst some lt grey ss. very few & local lignites mored pop corn crusts "gumbo" Details of Stratification are relatively vague as in Hell Creek area Some indurated ledges of yellow brown ss. A-860!