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20 F2, from last page. A few bone fragments part omitted. in the series between this and the lava, but no definite fossil horizon found. Corresponding zone Poorly delimited fossil zone about 15' thick Lowest mammal bones found in place. 35' lower barren tuffs, somewhat irregularly indurated. obscure below this 5'� massive gray tuff Continuation downward of main barranca 12' greenish pale yellowish clay with some limonite nodules. Highest bed of arg.} Argilus fis. type. Fissilaires Outlying hill near Contact slightly main barranca. Uneven. The arg. Fissilaires exposures here are much disturbed by tilting and small faults, but the section as given above appears to be continuous. Feruglio apparently placed the Argiles fissilaires about 20 meters lower. He also notes a second minimal horizon about 30 meters above the first check on these points. COLI-HUAPI 21 61. Ungulate lower jaw. Horizon of #54. [in Cueva del Cocodrilo]. J.H. 10/31/30. 1 block, 1 package. 62. Ungulate lower jaw. Horizon of #54. [in another cave]. J.H. 10/30/30. 2 blocks. 1 package. 28692 63. Miscellaneous fragments, from same bed as 54 etc. but ca. 1 km. farther east. G.G.S. 10/31/30. 1 package. 28768 64. Single lower molar. Basal cg. of lower channel series. Profile, p. 6 (around end of spur from where profile was taken). J.H. 10/31/30. 1 package. 28656 BARRANCA SSE of PARADA VALLE HERMOSO. 65. Ungulate jaw. Ca. 65� above argiles fissilaires, profile p. 20. G.G.S. 11/1/30. One package. 28581 66. X-section of skull, with at least 3 teeth. Ca. 5' below #65, prof. p. 20. J.H. 11/1/30. One package. 28627 67. Six frag. small jaws + isolated teeth, not assoc. Mostly on surface, but surely from same zone as #65, profile p. 20. Party. 11/1/30. One package. 28769-71 68. Fifteen frag. jaws, teeth, etc. Same data as #67. G.G.S. 11/1/30. One package. 28459-60 VALLE HERMOSO