Locality W-2 Continuing section of Skull Creek up from the base of the bentonite, which sits on black shale. 1.6 Bentonite 1.8 Shale, black with 0.4+ silt + Fe conc. silt at top, silt weath- white platy, Fe in blue black- weath to Fe brn weath with some sideritic masses. 9.0 Shale, dk gray to black weaths gray. Contains, from 1 to 5 feet from top, two types of concs with (Sample #1 ->) fish and reptile remains. At about 5' below top first concs appear, usually large 2-4' diam, Fe brn to purple black, with some chert nodules and fish remains. Loc. reptile bones. Above this mostly small elongate egg- shaped concs with white patina bluish gray rind + chert cores with fish fragments. At top is siltstone zone 0.2-0.4 locally with some brown siderite concs; generally festined. 25