The observations of Robert Hay1 upon the occurrence of a dark blue rock in seams 1-12 inches thick, intrusive in Pennsylvanian shales in the Silver City metamorphic area of Woodson County, Kansas, apparently were not confirmed by the later investigations of Twenhofel,2 and Twenhofel and Edwards,3 although these authors ascribed the metamorphism of the rocks of the locality to the action of igneous intrusives probably occurring some depth below the surface. In 1929 the writer observed fine dark blue and also coarse gray quartz rocks occurring as scattered fragments in the soil near one of the old...

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