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ten or more feet in thickness and has been denuded and redeposited in talus on each side of the cañon at the foot of the hilly slopes. On Tenth Street which begins at the Park entrance and ascends the hillside on its long (N + S) slope this layer has been cut through, exposing a very good section. Here the sand is distinctly crossbedded and is more or less sprinkled with cobbles and pebbles. The beds dip in a southerly direction about five degrees being a very little arched conformably to the typography. Layers are indicated in the sand by thin deposits of salt or limy matter making some harder and whiter than others and there are occasional limy concretions. At about the base of the sand there is a streak 1 - 2 feet thick composed mostly of waterworn and rounded pebbles of schist, red and green porphyry