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24 Notes on Profiles, p. 22. Profile A copied from pp. 4-6, half scale. Profile G is of these same beds, the middle series, about _ km. or a little more from where A was taken, on the east side of the spur. Here a thick channel series runs from the 'upper tuff' through the 'upper channel' of A. It contains many local unconformities, but no outstanding break or traceable divisions. The fossils in it are almost exclusively large astrapo- theres. The level of #69 is a heavy conglomerate at the line of profile, with very numerous but mostly very fragmentary fossils. This thick channel series grades rapidly laterally into more normal tuffs and at Profile H, less than _ km. away East is hardly recognizable as such, although there are still probably some coarse beds. Here is a thick lava flow, as shown, + a thin channel bed some distance above it. COLI-HUAPI 25 77. Various. Lower tuff, central part of barranca, Profile p. 32. G.G.S. 11/4/30. 1 package. 28693 78. Various. Just above lower tuff, Profile p. 32. J.H. 11/4/30. 1 package. 28775-7 79. Lower jaw, parts both sides. Profile p. 32. G.G.S. 11/4/30. 1 package. 28628 80. Nine dissoc. Teeth. Surface of lower tuff, as 77 or 79. G.G.S. 11/4/30. 1 package. 81. Upper cheek teeth, separate but assoc. As #77. G.G.S. 11/4/30. 1 package. 28678 82. Many specimens, frag. As #77. J.H. 11/4/30. 1 package. 28582, 28709-14 83. Several isolated specimens. Surface, near top of tuff, as 77. G.G.S. 11/4/30. 1 package. 28439. 84. Polydolopid upper M. As #78. G.G.S. 11/4/30. 1 package. 28438 85. Lower jaw. As #77. G.G.S. 11/4/30. 1 package. 28707