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138 Notes, profile CD. ? - This thick series of green clay and mingled clay, sand, + gravel, while not traced laterally exactly, clearly grades into and corresponds with part, and apparently the lower part, of the green beds of Section CF. The dip in this barranca exposure is variable but where the section was taken averages about 10� WSW, sufficient to carry the lowest exposed bed over the highest exposure of the sands of Pehuenche type if con- tinued. It is clear from a study of the whole area that these green beds lie largely or wholly above the Pehuenche-type sediments. The actual contact relations cannot be made out, it remains an open question whether they are unconformable, or intergrade vertically, or whether the basal part of the green series grades laterally into the top of the Pehuenche-type rocks. ?. The structure of this zone is complex and confusing, discontinuous exposures, folding, faulting, slumping. No definite guide horizon could be found. (p. 140) CA�ADON HONDO 139 436. Misc. bones (contacting). As #422. GGS 2/27/31. 1 pack. 3183 437. Do. Do. 3164 438. Do. Do. 3184 439. Do. Do. 440. Do. (Single). Do. 3185 441. Misc. As #422. Party. 2/27/31. 1 pack. 3186 16448 croc. 442. Misc. teeth _ all from one spot + in part assoc.? Above bird clay, prof. p. 130. G.G.S. 3/7/31. 1 Pack. 443. Misc. jaw frags + teeth, not assoc. Below bird clay, profile p. 124. Unworn upper pre- sented by Ing. Piatnitzky. Others, G.G.S. 3/7/31. 1 pack. 28875-7 444. Misc. mam. frags + shells, not in place but on sands as #445 but not same spot and hor. indet. C.S.W. 3/2/31. 1 pack. 28530-34