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Livermore Valley
Arroyo Mocho
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This valley is the next NE from Arroyo del Valle and is separated from it by a high divide. The lower part of it though wider is much like the Arroyo del Valle the rocks being apparently all of the tilted sandstones. About nine miles from livermore, (the road gradually ascending on or near the crest of the SW. divide) the summit which is of an extremely soft sandstone or sandy soil which gullies badly where the rain runs off, suddenly exhibits the schists which I had previously observed in a side cañon of the del Valle. They are in a much contorted state and above graduate into a shaly rock consisting largely