. Annual Reports of the Department of the Interior for the Fiscal Year Ended June 30, 1900--Twenty-First Annual Report of the United States Geological Society. been determined by fault planes. The inferred position of planes ofdielocation and their extensions, based upon observations in the field, are indicatedby the dottetl lines of the maps. The color scheme of this map is peculiar in that thedeepest shade of each color is used to show the position of the outcrops of a particularformation. Lighter tints of the same color are employed to show the inferred exten-sions of the formation beneath
. Annual Reports of the Department of the Interior for the Fiscal Year Ended June 30, 1900--Twenty-First Annual Report of the United States Geological Society. been determined by fault planes. The inferred position of planes ofdielocation and their extensions, based upon observations in the field, are indicatedby the dottetl lines of the maps. The color scheme of this map is peculiar in that thedeepest shade of each color is used to show the position of the outcrops of a particularformation. Lighter tints of the same color are employed to show the inferred exten-sions of the formation beneath the surface of the ground. When more than one tintof any color is used in addition to the one reserved for outcrops, the depth of the tintindicates the supposed altitude of the orographic block compared with other blockswhich are capped by the same formation. These inferences are based on both geolog-ical and tojHDgraphical peculiarities, but in the parts of the map showing the centralarea of Pine Hill and central Ragland the location of boundaries of blocks has beenmade with much less accuracy than in other portions of the U S. GEOLOGICAL SURVEY.
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Keywords: ., bookauthorunitedst, bookcentury1900, bookdecade1900, bookyear1901
