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126 NOTES, PROFILE CA. A. ? The "Bird Clay", specimens 3.., 422, etc., is a hard, massive, bright green clay with intercalated bands of white tuff. The latter are irregular, due to compression of the clay which has also produced many small slips. Both clay + tuff contain numerous bones ? bird, turtle, crocodile. The exposure is a stream bank, about 5' of the series exposed, neither overlying nor underlying beds in continuous exposure. A concentration of bones at the contact of clay + tuff is noticeable. Rock specimens: 58, 59. B. ? This has slumped, producing irregular bedding. Its contact with the bird clay is nowhere visible. C. ? Massive tuff, bedding not visible. Similar in appearance to B except absence of bedding + brighter color. D. ? Massive impure tuff, with mammals, showing on one side of hill an irregular contact with equally massive clay. E. ? A thick series, �35' exposed, of stratified bright green clay + white to greenish tuff. The dips are very irregular. Intercalated in the series is a band, 2"-4" thick, of white rock, very low sig. (p. 128) CA�ADON VACA 127 405. Skull frag. As #404. G.G.S. 1/8/31. 1 block, 1 pack. 28891 406. Miscellany. Horizon as #289 (profile, p. 100), but in next draw to the east (where section is almost identical). G.G.S. 1/17/31. 1 pack. 28827-8 407. Mammal hind leg. As 406. G.G.S. 1/17/31. 1 block, 1 pack. 28690 408. Skull, prob. Notostylops. As 406. G.G.S. 1/17/31. 1 block. 409. Mammal frag. skeleton. As 406. G.G.S. 1/17/31. 1 pack, 1 block. 28904 410. Cf. Albertogaudrya partial lower jaws. As 406. G.G.S. 1/17/31 1 block. 28697 411. Frag. lower jaw cf. Alberto- gaudrya. Horizon of #167 (profile p. 100). G.G.S. 1/17/31. 1 block. 28903 412. 3154 Vertebrae + ribs. Horizon of #404 but next zanj�n. [There is no doubt that this is in place and in the same bed as