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[[blank page]] [[end page]] [[start page]] of the road is a section of some of the whitish sandstone fine and nonfossiliferous (specimen). It weathers yellowish white or pale greenish and appears below in the valley at each side as a well defined stratum, at intervals. After issuing from the caƱon, the Tessajara flows through a flat alluvial bottom, of material derived from the adjacent hills deposited in nearly horizontal layers and covered to a considerable depth (5-10 ft) with black adobe. Through this material are sparsely scattered worm fossils, derived from the sandstones, mostly bivalves. Somewhere about the headwaters of this creek according to Dr. J. G. Cooper, some years ago Yates found some fresh