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to make a supporting wall for the outer edge of the road.
The town of San Luis Obispo is situated in a recess of the coast range. A creek runs through the center of the town. Along its' banks a few exposures occur mostly of greatly crumpled and contorted schists and clayslates; in some places the latter are strongly colored with iron oxide. A fine whitish sandy rock was observed in the form of pebbles but not in place. The hills in the immediate vicinity of the town appeared to be chiefly schistose and rock quarried from them for road metal was of this character with thin laminae of serpentine and some quartzose dyke rock. Decomposed granite was also observed.