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46 N. Profile at extreme eastern end of the main barranca. N1- From the base to the 'Gocodite tuff'. Bed Y has been traced continuously to other sections. No one of the other beds can be followed surely. BASE OF PROFILE N2 'Y' #257 55' Impure white and yellowish tuff. More or less pink Hard band 26' grey or, seldom, #253 pinkish tuff. 12' Yellowish to pinkish tuff #252 14' Impure yellowish tuff. 19' Impure yellowish to brownish tuff #254, 256. Lowest 4'� Concretionary greenish tuff mammal bones 23' Impure yellowish or in place, ca. Buff tuffs. R33 (gypsum) 25: Variegated concretionary + partly silicified bright clays + tuffs of argiles fissilaires CA"AD�N VACA 47 174. Jaw frag. + several unassoc. teeth. As #167. G.G.S. 1/6/31. 1 pack. 28806 175. Skull + assoc. jaw frag. As #171. C.S.W. 1/7/31. 2 blocks, 2 packs. 28636 176. ?Isotemnid skull. As #171. C.S.W. 1/8/31. 1 block, 1 pack. 28754 177. ?Isotemnid maxillary frag. 2 M�s. As #166. C.S.W. 1/14/31. 1 pack. 28629. 178. Small notoungulate jaw. As #171 but perhaps not in place. C.S.W. 1/14/31. 1 pack. 28807 179. Fore-foot bones. Profile p. 100 C.S.W. 1/14/31. 1 pack. 28647 180. Albertogaudrid skull + jaws. As #166. C.S.W. 1/16/31. 28447 181. 2 snake vertebrae. In wash at level of 166 C.S.W. 1/24/31 � blocks, 1 pack. 3155 182. Small jaws, etc. In wash at level of #175. C.S.W. 1/24/31. 28839