Locality 48 - Bluffs south of Hump Creek. Re-examination of this section shows that the 8-foot layer atop the bedded beds is a zone of contorted blocks of "Colgate" in clayey silt, and is a bedding texture not a recent slump, the small pinnacle of bedded beds out from the Colgate-Hell Creek scarp has this layer as a "corerock". Even concentrationary blocks in it show rolling of laminae. This flow-zone is present throughout the limited area where the bedded-bed-Colgate contact is exposed at this locality. Underlying bedded beds locally rumpled and scooped out, Although no other Bullhead member exposures measured to date in this area it is obvious from outcrops N. of Hump Creek & E of So Dr Rt 65, that this section has less of the member than normally present. This may be due to fact that Colgate locally thick here whereas to N. Colgate thin. The "flow zone" being present with thick Colgate may be significant,