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60 There are true folds in this region,the only ones seen in the long barranca sections where slumping has surely not occurred, + similar whether the beds be composed of Tertiary, arg. fis., undoubted Cretaceous (to Pehuenche) or any combination of these. These are the very broad folds with clips of a few degrees, generally clearly perceptible only where the beds can be followed for a kilometer or more ? the "tipo de plegamiento que caracteriza al cumplexo Terciario" of Windhausen. Without prejudice to the possibility of numerous parallel unconformities here or of angular unconformities elsewhere, this is the only folding of which there is any evidence in the region so far studied (Nov. 28, 1930). It is subsequent to the Pyrotherium + probably also to the Colpodon beds. We found no fossils in the argiles fissilaires, + there appears to be no record of any ever being found in place there. NOTOSTYLOPENSE: The lowest fossils in place were found about 25' above the argiles fissilaires(Profile, p. 46), the highest in the same section surely notostylopean about 130' 135' above this. Fossils apparently of the Notostylopense were found at numerous levels through about 150' of beds. It is not yet apparent whether there is any faunal difference in this rather thick series. Nothing in it checks at all with Ameghino's Upper Notostylops stratigraphically. Once found, the fossiliferous beds are easily found at any point along the whole barranca by a key horizon which we have traced continuously from end to end + which can always be recognized. COLI-HUAPI 61 237. Polydolopid lower jaw. Profile, p. 38. G.G.S. 11/16/30. 1 pack. 28434 238. Miscellany. As #237. G.G.S. 11/16/30. 1 pack. 239. Jaw. As #78. J.H. 11/15/30. 1 pack. 28665 240. Miscellany. As #237. J.H. 11/16/30. 1 pack. 28436 28857 241. Jaw, three teeth. Profile, p. 40. G.G.S. 11/19/30. 1 pack. 28666 242. 5 frag. l. jaws + 3 uppers, in manganese. Profile, p. 40. GSS 11/19/30. 1 pack. 29435-43 243. Bone frags. etc. As #242. GSS 11/19/30. 1 pack. 3157 244. Teeth etc. As # 242. G.G.S. 11/19/30. 1 pack. 29454-5 245. Jaw, 2 teeth, found on lower level as #246, but not in place + probably from level of #242. G.G.S. 11/18/30. 1 pack. 28593