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140 At about the point where the ?is, and somewhat outside the line of section, there is an isolated stream-bank exposure of bright green clay, closely similar to the "bird clay" and containing small bone fragments, resting on white sandstone, the bas of which is not visible. ?. The "pillar bed" [below] is over- lain by clays, generally gray to pale greenish, and fine to very coarse white, gray, or yellowish x-bedded to massive sands. In this series, about 20' above the pillar bed, is a lens of coarse sandstone, distinctly cross-bedded and of thickness up to about 2', in which occur many fragmentary and dissociated mammal bones, jaws, teeth, etc. #445, 446, 450. The bed is generally hard, topping small hummocks, and weathers either in slaty fragments or in coarse blocks, often with honeycombed surfaces + frequently reddish where weathered. R78, 79. This is part of a thick series of clays and sandstones totally unlike the usual "Eocene tuffs" and resembling the usual Pehuenche sediments. A continuous section cannot be taken + the beds, from their lenticular p. 142. CA�ADON HONDO 141 445. Mammals, etc. Sands, see p. 140. Definitely in place. C.S.W. 3/16/31. 1 pack. 28563-72 446. Do. Do. G.G.S. 3/16/31. 1 pack. 28523-29 28573-78-79 447. Misc. 10 meters above #418 etc. C.S.W. 3/2/31. 1 pack. 28623 448. Misc. toe bones. As #418. C.S.W. 3/2/31. 1 pack. 28624 449. Two bones of slight or no importance. As #422. Party. March '31. 1 pack. 450. Mammals, etc. Sands, as #445. Party. 3/18/31. 1 pack. 28535-62 3156 451. Lower jaw, large, 6 teeth. Surface, profile p. 153. G.G.S. 3/20/31. 1 pack. 28677 452. Two maxillae, assoc., sans teeth, or nearly. As 451. GGS 3/20/31. 1 pack. 28626