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Saturday, May 16, 2020 | History

2 edition of Volcanic rocks of the El Modeno Area, Orange County, California found in the catalog.

Volcanic rocks of the El Modeno Area, Orange County, California

Robert F. Yerkes

Volcanic rocks of the El Modeno Area, Orange County, California

by Robert F. Yerkes

  • 178 Want to read
  • 11 Currently reading

Published by U.S. Government Printing Office in Washington, DC .
Written in English

    Subjects:
  • Volcanic ash, tuff, etc. -- California -- Orange County.,
  • Rocks, Igneous.,
  • Geology, Stratigraphic -- Miocene.

  • Edition Notes

    Statementby Robert F. Yerkes.
    SeriesU.S. Geological Survey professional paper -- 274-L, Shorter contributions to general geology
    ContributionsGeological Survey (U.S.)
    The Physical Object
    Pagination313-334 p. :
    Number of Pages334
    ID Numbers
    Open LibraryOL20591657M

    (Bedford Canyon metasedimentary rocks are exposed in Santa Ana Mts) Julian Schist Metasedimentary rocks formed from shale deposited in submarine fans Santiago Peak Volcanics Forms the western edge of the peninsular batholith in southern California. It is composed of volcanic, volcaniclastic rocks of Cretaceous age ( to Ma). Introduction California’s geologic history is very complex, most of the state did not exist as a coherent piece of the earth’s crust until relatively recently in geologic terms. Rock formations that are now adjacent often have very different histories. Some of the larger collisions were associated with major episodes of tectonic activity—intrusive and extrusive volcanic.

    Mesozoic volcanic rocks, unit 4 (Peninsular Ranges) (Late Jurassic to Early Cretaceous) at surface, covers 2 % of this area. Undivided Mesozoic volcanic and metavolcanic rocks. Andesite and rhyolite flow rocks, greenstone, volcanic breccia and other pyroclastic rocks; in part strongly metamorphosed. Includes volcanic rocks of Franciscan Complex. The Amboy volcanic field covers an area of 70 km2 between Bagdad Dry Lake to the west and Bristol Dry Lake to the east in the Mojave Desert, California. It contains mainly pahoehoe lava flows. Amboy crater proper is a prominant cinder cone in the NE of the lava field.

    site is entirely underlain by deposits of the El Modeno Volcanics, a middle Miocene volcanic rock unit that is interbedded with marine sedimentary rocks of the Topanga Formation. Weigand, P. W., Savage, K. L., and Nicholson, C. C., , Calc-alkaline magmatism in an extensional environment: Petrogenesis of the Miocene Conejo Volcanics in.


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Volcanic rocks of the El Modeno Area, Orange County, California by Robert F. Yerkes Download PDF EPUB FB2

Square-mile area east of El Modeno, Orange County, California, on the west flank of the Santa Ana Moun­ tains. The volcanic rocks rest conformably upon the strata of the Topanga formation, which include at least two thin tuff beds (tui on the geologic map, pi.

46). The El Modeno volcanics are made up of three by: 6. Get this from a library. Volcanic rocks of the El Modeno Area, Orange County, California book. [R F Yerkes; United States. Department of the Interior.; Geological Survey (U.S.)] -- Description of extrusive pyroclastic and flow rocks of El Modeno volcanics of middle to late Miocene age.

Volcanic rocks of the El Modeno area, Orange County, California; ; PP; L; Yerkes, R. Get this from a library. Volcanic rocks of the El Modeno area, Orange County, California. [Robert F Yerkes]. Get this from a library. Volcanic rocks of the el Modeno area Orange county California: description of extrusive pyroclastic and flow rocks of El Modeno volcanics of.

Volcanic rocks of the El Modeno area, Orange County, California Professional Paper L By: R.F. Yerkes. 2) "Volcanic Rocks of the El Modeno Area Orange County California; Description of extrusive pyroclastic and flow rocks of El Modeno volcanics of middle to late Miocene age" by Robert F.

Volcanic rocks of the El Modeno Area, published in by the U.S. Geological Survey as Professional Paper L. Volcanic rocks of the El Modeno Area, Orange County, California / by: Yerkes, R.

F., Published: () Lake Bonneville quaternary stratigraphy of eastern Jordan Valley, south of Salt Lake City, Utah / by: Morrison, Roger B. Published: (). The El Modeno Volcanics (basalt and andesite) volcanic rocks "overlie and are interstratified with fossiliferous sedimentary rocks of center Miocene (Luisian) age and are overlain through fossiliferous sedimentary rocks of more beneficial center Miocene (decrease Mohnian) age (Yerkes, ; Smith, ; Schoellhamer and others, ; T.H.

The Los Angeles basin is an elongate topographic depression on the southwestern coast of California. It marks the site of a former marine basin in which a maximum of ab feet of sediments accumulated during Tertiary times.

Volcanic activity in this basin began during early middle Miocene (Relizian) time and ended during late Miocene (Mohnian) time. In the hills east of Orange, you can find younger volcanic rocks.

The El Modeno Volcanics (basalt and andesite) volcanic rocks "overlie and are interstratified with fossiliferous sedimentary rocks of middle Miocene (Luisian) age and are overlain by fossiliferous sedimentary rocks of upper middle Miocene (lower Mohnian) age (Yerkes, ; Smith, ; Schoellhamer and others, ; T.H.

McCulloh. Yerkes, R.F.,Volcanic rocks of the El Modena area, Orange County, California, IN Shorter contributions to general geology, U.S. Geological Survey. The local volcanic activity wasn’t the kind you traditionally think of, with towering volcanoes and dramatic eruptions, but Orange County dwelled in the bleak fiery landscape of “The Lord of.

General Information. Title: Volcanic rocks of the El Modeno area, Orange County, California Author(s): Yerkes, R.F. Publishing Organization: U.S. Geological Survey Series and Number: Professional Paper L Larger Work: Shorter contributions to general geology, Publication Date: Map Scale:Cross Section: Yes North Latitude: 33° 50' 2" N ().

Volcanic rocks of the El Modeno area, Orange County, California,Professional Paper L Bikini and nearby atolls, Marshall Islands; seismic-refraction studies of.

Hidden on the eastern edge of Orange, CA, the El Modena Open Space is a natural getaway rich with volcanic formations, wildlife, and beautiful views. Its rugged trails and free growth, in contrast with all of the well-manicured parks in the area, have made it a favorite with locals looking for a.

Within the Mojave National Preserve, two notable areas that display volcanic rocks and associated landforms include the Cinder Cones and Lava Flows National Natural Landmark Area (which encompasses many Quaternary-age volcanoes) and the Hole-in-the-Wall area (a more ancient volcanic area). Other areas of extensive volcanic rocks are the Piute.

Smaller areas of unmetamorphosed volcanic rocks dating from the Tertiary Period are also present in San Diego County, as well as in surrounding portions of Orange, Riverside, and Imperial counties and, in particular, in northwestern Baja California (Gastil et al.

; Rogers ; Strand ). Elsewhere in California, Oligocene rocks have been differentiated but generally in the Orange County area the Vaqueros-Sespe Formations are interbedded and almost impossible to separate.

Where a differentiation can be made, the red-colored Sespe Formation is a continental deposit and the buff-colored Vaqueros Formation is marine and contains marine invertebrate fossils.

Igneous rocks — those which originate from magma — fall into two categories: extrusive and intrusive. Extrusive rocks erupt from volcanoes or seafloor fissures, or they freeze at shallow depths.

This means that they cool relatively quickly and under low pressures. Therefore, they are. The project site is entirely underlain by deposits of the El Modeno Volcanics (Morton and Miller ).

The El Modeno Volcanics represent a middle Miocene volcanic rock unit that is interbedded with marine sedimentary rocks of the Topanga Formation.

In the project area it is dominated by tuff and tuff breccia (Morton and Miller ).Adsorption of sulfur hexafluoride onto crushed tuffs from the Yucca Mountain area, Nye County, Nevada U.S. Geological Survey ; Denver, CO: For sale by Book and Open-File Report Sales, ), by William F.

Cannon (Pliocene and Pleistocene), Lake County, California: a redefinition of nonmarine sedimentary rocks and tuff.California: Name: Tertiary volcanic flow rocks, unit 8 (Southern California Basin) Geologic age Glendora Volcanics (part), Conejo Volcanics (part), El Modeno Volcanics (part), References: Stanley, R.G., Wilson, D.S., and McCrory, P.A.,Locations and ages of middle Tertiary volcanic centers in coastal California: U.S.

Geological Survey.