Locality 74 - and vicinity. (1) Amphitheatre channel. Corbicula distrib. in current-bedded shingle and more sparsely in intervening sandy beds in which spec. with valves flattened common. Fresh samples of latter show Corbs in excellent state preservation Thayer's jaws from bed of scattered corbs about 18" above shingle bed at base channel. Shingle bed locally cross-laminated] Chercozi common throughout the shingle beds. Crossostrea shells assoc with channel are markedly thinner than those of most Colgate beds - several show attachment to stalks. (2) Traverse along lower Hell Creek from our section at 74 NW to center of Sec. 29. Includes part Loc.74 and 304 (see next p.). Union's locally common to abundant not only in or at base of lower Colgate-like sand lenses, but also in sandy to silty clays between them. Union beds 12