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110 of untransported fossils, skulls, associated limb bones, etc., than is common in previous notostylopense ex- posures. At the base of the section here, toward the deeper part of the Ca�adon, are stream deposited sands and gravels, often of a characteristic brick red color, with clays, generally sandy. No fossils were found in these beds. Between them and the tuffs is about 100' of shale, likewise barren so far as seen. The bedding is not visible. The surface is mantled by checked weathered clay and digging in only reveals that it is not laminated or thinly bedded. It contains large areas that are colored yellowish or reddish but the general tone is gray. Except in the basal part where sandstone lenses occur and where it appears not to be regionally sharply separated from the underlying sands, it contains little or no sand. In many places there are large patches with very numerous siliceous concretions, usually less than a foot in diameter. The upper few feet are generally highly concretionary, the silicified matter sometimes occupying more space than the argillaceous, but it nowhere closely resembles the "argiles 336 111 337 338 IN 339 BOOK TWO 340 341 342 343 344