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14 Remarks, Profile D, p.12. Following the deposition of the intermediate tuffs (beds on lower part p. 4 + top p.6) was a period of erosion. The lower contact of the lava is broadly uneven and obviously dis- cordant in places, cutting across the bedding. Where the lava does not occur the level of this surface is usually marked by a lithologic change, but where observed is nearly horizontal and appears concordant. Between the lava and the upper channel beds, which sometimes but not invariably reach the lava, are barren green clays (probably in part from decomposition of the lava) and sandy clays. Then follows the upper channel series, resting on an eroded surface. The lavas represent surface flows, and apparently were subjected to considerable decomposition and then erosion before the deposition of the upper channel beds. 15 COLI-HUAPI 39. Colpodon. 5 lower teeth, associated + in place but not in contact. C.S.W.- G.G.S. 10/25/30. 1 package. 5' below #15. 29717 40. A. Small notoungulate jaw. {From zone 5� below + B. Rodent skull.up to hor. Of #15. C.S.W. 29655 C. Small ungulate partial skull. 10/25/30. 4 pack- D. Rodent jaw. 29710 ages. N.G. Discarded. 41. Large isolated molar. About horizon of #15. J.H. 10/26/30 One package. 42. Fragments of shattered armadillo skeleton. Found disintegrated on top of barranca, with decayed fragments of burlap bandages on which could be read 'TOP 1207' and initials obscure, but probably 'HR.' Probably came from an excavation below, at the level and locality of #43. One package. 10/26/30. 43. Astrapothere teeth and fragments of skull. 15' above (crossed out: point) #8. (crossed out: J.H. +) G.G.S. 10/26/30 2 blocks. 29724 44. Parabderites large sp. Lower jaw. Level just below #15. J.H. 10/26/30. Wrapped with #34. 29667