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134 Notes, Profile CC. This section contains no identifiable fossils, but is of stratigraphic + tectonic interest. The fault shown has an average dip of about 65�, strike roughly NE- SW, throw 30' or a little more. It is truncated by unfaulted Patagoniano. Thus there is a well defined period of tectonic disturbance and of erosion before the Patagoniano and after the pink tuff (not yet dated but probable Pyrotherium beds), although the beds are Nearly parallel. The basal plane of the Patagoniano, as seen in section, is almost flat, very sharp. Numerous borings, up to �" in diameter and 4" long, mostly of this form: and full of cemented [Spec. I4]. sand extend from the plane of unconformity down into the tuff. There is no transition from tuffs to Patagoniano, but a sharp division representing a distinct hiatus. CA�ADON HONDO 135 420. Frag. mam. bones. As #418. To show peculiar type of preservation. Party. 2/23/31. 1 pack. 421. Fossil leaves. Laminated clays, see p. 152. Party. 2/23/31. 1 pack. (B-4, B-5, B-6) 422. Frags of bird bones, assoc. "Bird clay", see p. 124. GGS 2/25/31. 2 packs (tied together). 3171 423. Various assoc. bones. Near #422 and possibly assoc. with it. GGS. 2/25/31. 1 pack. 3172 424. Assoc. frag. bones. Near #422 + poss. assoc. GGS 2/25/31. 1 pack. 3173 425. Bird bones. Nr. #422 + poss. assoc. GGS 2/25/31. 1 pack. 3174 426. Several bones not assoc. As #422. GGS 2/25/31. 1 pack.