Series	Geological Survey professional paper ; 274-L Shorter contributions to general geology Geological Survey professional paper 274-L. ^A16492 Shorter contributions to general geology ; 1955-57. ^A20586
Contents	Abstract -- Introduction -- Previous investigations -- Localities from which samples were obtained -- Descriptive geology -- Igneous rocks -- Tuffs of the Topanga formation -- El Modeno volcanics -- Basalt flow member -- Palagonite tuff and tuff breccia member -- General description -- Palagonite tuff breccias -- Bedded palagonite tuff -- Andesite flow and flow breccia member -- General description -- Flow Breccias -- Lava flows -- Hydrothermal alteration -- Limy volcanic breccia -- Undifferentiated volcanic rocks -- Andesite dikes -- Associated igneous rocks -- Breccia -- Basalt dikes -- Tuffaceous material in La Vida member of Puente formation -- Summary of petrography -- Sedimentary rocks, Cenozoic system -- Silverado formation -- Santiago formation -- Vaqueros and sespe formations, undifferentiated -- Topanga formation -- Puente formation -- Quaternary terrace deposits -- Stratigraphic position and correlation of the volcanic rocks -- Structure -- Folds -- Faults -- Disconformities in the volcanic sequence -- Mode of deposition of the volcanic rocks -- Subsurface data -- Distinction between extrusive and intrusive rocks -- Distribution of the volcanic rocks -- References cited -- Index.
Subject	Description of extrusive pyroclastic and flow rocks of El Modeno volcanics of middle to late Miocene age.
Local note	Joyner-FOR JOYNER LIBRARY HOLDINGS OF THE SERIES, GEOLOGICAL SURVEY PROFESSIONAL PAPER, SEARCH BY CALL NUMBER QE75 .P9.
General note	"Description of extrusive pyroclastic and flow rocks of El Modeno volcanics of middle to late Miocene age."--T.p.
Bibliography note	Includes bibliographical references and index.
Issued in other form	Online version: Yerkes, R. F., 1923-. Volcanic rocks of the El Modeno Area, Orange County, California
Govt. docs number	I 19.16:274-L

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