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hills are composed of Miocene sandstone and gravelly strata  The lower layers near or in the bed of the creek are composed of river pebbles mixed with worn and broken Miocene shells, oysters, Venus Tapes, and over bivalves with an occasional Gastropod crushed together with many small quartzite pebbles worn smooth. The rock is very hard and the material clearly the compacted result of the beachworn marine fragments and the gravel of streams, the layers a good deal twisted but the stratum composed of them conformable with those above. The dip is entirely variable but on the whole the strata dip eastward from a few to nearly 30 degrees. A mile or two up the cañon