File: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 (1901) (14804443033).jpg

Identifier: annualreportsofd003unit (find matches)
Title: 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
Year: 1901 (1900s)
Authors: United States Department of the Interior
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Contributing Library: Clemson University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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in extending the boundaries of the igneous rocks so as to include areas U. S GEOLOGICAL SURVEY TWENTY-FIRST ANNUAL REPORT PAR T III PL LXIII
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Igneous nxks FOrHCIIl^: MOrXTVIN HAIXITK DISTHU^rP r I .AS KI r 01 N T\, AHKVS S AS l();)<)i^rnphy and )*eolofti<- l)oumlnncs, IVoni Arkansas ()eolo6i<^il Survoy Scaleo Cohloiir iiUonal 20U^ HAYES) FOURCHE MOUNTAIN DISTRICT. 455 covered by bowlders and soil evidently derived from the syenite itself.Such areas would appear to belong properly with the syenite ratherthan with the overlying Tertiary sediments. These changes in forma-tion boundaries, however, arc mere matters of detail, and do not mate-rially affect the value of Dr. Williamss map. On the map publishedherewith no attempt has been made to represent the several rock typesdifferentiated ))y Dr. Williams. The igneous rocks are representedby a single pattern, and the more or less altered Paleozoic rocks byanother; also, the discrimination between Tertiary and Pleistoceneis omitted. A very detailed study of the district might enable oneto make this discrimination, but.it would probably differ materiallyfrom that represen

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