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142 nature cannot be recognized over any great distance, but this general series of sand + clay continues down the Ca�ad�n without any noteworthy change in type of sediment into apparently true Pehuenche, with Banco Negro near the river. Almost every sand is locally unconformable on the underlying clay, but it is impossible to establish any of these as a regional unconformity, although any could be such. ?. An outstanding peculiarity is the so-called "pillar bed" which outcrops intermittenly over an area perhaps � mile in maximum diameter and is unlike anything seen elsewhere. This consists of a soft sandstone, very uniform but with some traces of bedding, with harder or more re- sistant vertical pipes which weather out as pillars. Av. Diameter ? 1'-2' Height varies from 3' ? 10' when complete. They occur in a zone about 20' thick and do not all appear to begin and end exactly the p. 144 CA�ADON HONDO 143 453. 2 ankylosed pathologic vertebrae. As #451. GGS. 3/20/31. 1 pack. 28446 454. Various isol. skel. parts, all on surface with #451. GGS 3/20/31. 4 packs. 455. Fossil leaves. Profile, p. 152. C.S.W. 3/20/31. 2 tins, 1 pack. (B-7, B-8, B-9, B-10, B-11, B-12) 456. Misc. isol. mam. teeth. Profile, p. 151. G.G.S. 3/18/31. 1 pack. 455A. Fossil leaves. Nr. 455, horizon ca. 10' higher. G.G.S. 3/20/31. Part of a box, not in packages. (B-13, B-14, B-15) 457. Fish ? ca. 20. Profile, p. 152. Party. Chiefly 3/18/31. Part of a box ? not in packs. 10,000 ? 10011 Fossil Fish cat.