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18 Profile of barranca on northern F. edge of pampa Castillo, SSE of R.R. stop Valle Hermoso and near Ca-adon Pedro. Thick marine beds. Limestone layer 25'+ pale olive-colored clay, becoming sandier above and with many marine fossils. Unconformity, with lava lenses. 25� softer yellow clay and tuff Gradation 15' � Very irregular hard tuff with some tuff pebbles and limonite nodules 15' � Yellow clay with tuff lenses. 6'+ Massive gray tuff, very irregular lower contact + with basal cong- lomerate Unconformity 175' Impure tuffs and tuffaceous clays, concordant, horizontally banded, mostly soft but partly indurated irregularly in lower part. Yellowish, pink or gray. COLI-HUAPI 19 52. Five rodent jaws and other odds + ends. Within 2 or 3 feet of horizon of #15. J.H. + G.G.S. 10/24/30. One package. 29675-9, 29670 3239 3237 53. Four isolated mammal teeth or jaw frags. Not assoc. but same level, lower massive tuff, see profile p. 6. G.G.S. + J.H. 10/29/30. One package. 28765 54. Notoungulate skull, crowns of teeth not seen. J.H. + G.G.S. 10/29/30. Lower part of lower tuff profile p. 6. 3 small blocks, one package. 28878 55. Crocodile, fragmentary skull + jaws. Same level as #54. J.H. + G.G.S. 10/29/30. One block. 1 package. 3158 56. Fragments of mammal lower teeth, associated. 6' o 7' above main lower tuff, see pro- file, p.6. J.H. 10/29/30. one package. 57. Small ungulate palate. Just above lower massive tuff. Profile, p.6. J.H. 10/29/30. one package. 28706 58. Leontiniid molar. Surface, just below upper hard bed of upper channel series. J.H. 10/29/30. One package. 59. Isolated teeth, not assoc. Same level as #54. G.G.S. 10/30/30. One package. 28655 60. Mammal skull. Same horizon as #54. J.H. 10/31/30. 1 block. 28700
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