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P 172. miles) and probably is the same. 8. Beneath this is a series of clays, quite concordant to the base of the continuous section over 170'. The upper part is very tuffaceous, with many beds of fairly pure but fine tuff the lower sandy. A visible but artificial separation is into thick upper tuffaceous beds, a middle series with opaline concretions, and a lower sandy series. The upper tuffaceous beds contain numerous bone fragments but very much broken up & generally minute ? no identifiable ones were found. About 75' below the top of these are lenses of sandstone up to 4' thick, rather hard, coarse, grey but often weathering orange, similar to the so-called Pehuenche type. There also unidentifiable bone fragments were found. This is exactly similar macro- scopically to the sandstone with mammals in Cahaclon Hondo (profile CD, p 136) But the surrounding beds are not similar in the two cases. P 173 SPECIMENS Profile DB, 1-1/2 Leagues NE of Cobeza Blanca. 319. Misc. mamm. Profile p 168. c.s.w. &o.g.f. 3/26/31, 1 pack. 320. Misc. mamm. Profile p. 169 Not all in place. c.s.w. 3/26/31 1 pack. 28406- 28412, 28487, 28504, 28869-870-3. 321. Misc. mamm. As # 320 o.g/f 3/26/31 1 pack 28500-501 322. Misc. Mamm. Not in place. Nor indef. Party 3/26/31 1 pack. 28605, 28824