occur close together, former possibly above. Ammonites in protoceratiz conchs chiefly multinode types, nicolletis are rare. This distrib. needs explanation. July 14—Fort Yates reconnaissance. The Trail City not exposed around Fort Yates. North of town zone large “cannonball” type concretions contain sparse fauna including large sphenodiscus. Relation to Tencrediz-Helymanites zone not determined. General notes on Fox Hills. According to Stevenson no types for either Trail City or Timber Lake members. S.D. Survey practice is to call it T.C. with first sand in shale, 2nd carry it up to first massive sand which is Timber Lake. If these two units are persistent, and they appear to be, then faunal distribution in them is peculiar and needs explanation. Example is Timber Lake member. In Corson Co. has Tencrediz-Helymanites locally – may be restricted to part. Locally some Gardilliz concs?, but 6