Description: Geology and mineral deposits of the Poncha Springs SE quadrangle, Chaffee County, Colorado

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Geology and mineral deposits of the Poncha Springs SE quadrangle, Chaffee County, Colorado

Additional title page description: Description of Precambrian, Tertiary, and Quaternary geology and examined deposits of copper-zinc, fluorspar, gravel and sand, manganese, and pegmatite in part of the Arkansas Valley.

Main Author:	Van Alstine, Ralph Erskine, 1914-
Other Authors:	Colorado. Mining Industrial Development Board., Geological Survey (U.S.),
Format:	Book
Language:	English
Published:	Washington : U.S. Govt. Print. Off., 1974.
Physical Description:	iii, 19 pages : illustrations, 1 folded color map (in pocket) ; 29 cm.
Series:	Geological Survey professional paper ; 829.
Subjects:	Mines and mineral resources -- Colorado -- Chaffee County. Geology -- Colorado -- Chaffee County.

Summary:	Additional title page description: Description of Precambrian, Tertiary, and Quaternary geology and examined deposits of copper-zinc, fluorspar, gravel and sand, manganese, and pegmatite in part of the Arkansas Valley.
Item Description:	"Work done in cooperation with the Colorado State Mining Industrial Development Board." Includes bibliographical references (pages 18-19). Abstract -- Introduction -- Earlier reports -- Acknowledgments -- Settlement and climate -- Terrain -- Geologic units -- Precambrian rocks -- Metamorphic rocks -- Banded gneiss -- Hornblende gneiss -- Metagabbro -- Origin of the metamorphic rocks -- Pegmatite -- Tertiary rocks -- Volcanic rocks -- Lower rhyolitic ash-flow tuff -- Rhyodacite flow and tuff -- Upper rhyolitic ash-flow tuff -- Dry Union Formation -- Quaternary deposits -- Pleistocene deposits -- Gravel -- Holocene deposits -- Alluvium -- Fan alluvium -- Landslide debris -- Structural geology -- Geomorphology -- Economic geology -- Base metals -- Fluorspar -- Gravel and sand -- Manganese -- Pegmatite minerals -- References cited. Additional title page description: Description of Precambrian, Tertiary, and Quaternary geology and examined deposits of copper-zinc, fluorspar, gravel and sand, manganese, and pegmatite in part of the Arkansas Valley.
Physical Description:	iii, 19 pages : illustrations, 1 folded color map (in pocket) ; 29 cm.
Bibliography:	Includes bibliographical references (pages 18-19).