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54 OBSERVED FACTS: Tertiary Argiles fissilaires Pehuenche POSSIBLE INFERRED STRUCTURES: A. Post ? Argiles fissilaires folding. Pre-Notostylopense unconformity. B. Folding post- Notostylopense (at least). No angular un- conformity. C. No folding. No angular unconformity. Recent slumping. 1. The steep folding + faulting of the a. f. is almost confined to areas where it lies on an eroded slope in front of a large barranca. 2. The steep clips are seldom or never seen in the main barranca (except one or two cases of obvious slumping). Where a.f. occurs in the main barrancas it has only gentle clips. 3. The majority of the steeply tilted blocks of a.f. have the dip toward the barranca, in whatever COLI-HUAPI 55 209. Two lots 2 assoc. upper M's each As #77. G.G.S. 11/8/30. 1 pack. 28844 210. Tooth + jaw frags., all same place, partly assoc. As #77. G.G.S. 11/8/30. 1 package. 28818 211. Seven partial jaws + assoc. lots of teeth. As #79. G.G.S. 11/8/30. 1 pack. 28702-3-4 28719 212. About 35 isol. teeth etc. Surface, as #203. G.G.S. 11/8/30. 1 package. 28462 28497 28590 28474 213. Didolodontid lower jaw. As # 79. J.H. 11/8/30. 1 package. 28475 214. "Ensalada criolla" As #203. J.H. 11/8/30. 1 pack. 28845 215. As #214. 28498 28721-7 216. Skull frag. As #79. J.H. 11/8/30. 1 pack. 28720 217. Jaw frag. As #79. J.H. 11/8/30. 1 pack. 28892 218. As #217. 28763