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VOLCANIC CORES

The discovery of this center of volcanic eruption, the core of what has since been called the dissected volcano of Crandall Basin (Iddings, 1893b), was one of those delightful experiences which happen occasionally in the lifetime of an explorer in any field of research. It was more delightful than the finding of the volcano core at Electric Peak had been two years before, because that had been anticipated in a measure by the discovery of a specimen of diorite in Wright's collection with its suggestion of what was to follow. The finding of the Crandall core was the outcome of several days' exploration of the volcanic ridges south, where dikes of andesite-porphyry and basalt were observed trending from various places toward one spot beyond a narrow steep ridge on the south side of Crandall Creek. On the crest of this narrow ridge dikes were very numerous and the focus of their directions very definite, so that we had great hopes that there might be a core of coarse-grained rocks exposed to view at no great distance. Camp was accordingly moved across the narrow ridge into the deep valley of Crandall Creek. The descent into the valley was a scramble for horses and pack mules, down the steep slope through small timber, and it was necessary to locate camp up the valley for grass and level ground. Not until the next morning could I explore the lower, narrow valley for the expected coarse-grained rocks. They appeared where they were

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