Annual report of the United States Geological Survey to the Secretary of the Interior . Fig. 19.— Diagrammatic map of the massive and schistose rocks of the Bidwell Bar area, showing themanner in which the lines of schistosity are, as a mle. parallel to tho contact of the massive graniteareas, which are represented in white without hachures. Van Hise1 writes iu regard to this phenomenon: These relations are taken to mean that the surrounding schistose rocks representsedimentary beds which have been thrust aside by the entering granite. Along thecontacts of the Laurentian (Archean) and the Cout
Annual report of the United States Geological Survey to the Secretary of the Interior . Fig. 19.— Diagrammatic map of the massive and schistose rocks of the Bidwell Bar area, showing themanner in which the lines of schistosity are, as a mle. parallel to tho contact of the massive graniteareas, which are represented in white without hachures. Van Hise1 writes iu regard to this phenomenon: These relations are taken to mean that the surrounding schistose rocks representsedimentary beds which have been thrust aside by the entering granite. Along thecontacts of the Laurentian (Archean) and the Coutchiching (Algonkian) are foundsuch minerals as andalusite, staurolite, and Bull. Survey , p. 67. Indicating contact metamorphism.—H. W. T. 556 GEOLOGY OF THE SIERRA NEVADA. The similarity of the two districts goes further than the structure,for in addition to the granite there are considerable serpentine masses,and belts of hornblende schists, with minor amounts of true differing widely in age, some of the sediments of the BidwellBar area
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