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

Yerkes, R.F.

doi:10.3133/pp274l

Cited by 7 publications

(12 citation statements)

References 6 publications

(2 reference statements)

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“…In the Santa Ana Mountains the upper sequence is represented by olivine basalt flows, palagonite tuff and tuff breccia, and andesitic flows and flow breccias, which locally contain interbedded foraminiferal siltstone (Yerkes, 1957). Similar volcanics are present above schist breccia lenses in several wells drilled along the southwest flank of the central block.…”

Section: Upper Sequencementioning

confidence: 96%

“…At least three sources for the widespread and locally thick upper middle Miocene volcanic rocks of the Los Angeles basin area can be identified, but, despite extensive study (Shelton, 1954(Shelton, , 1955Yerkes, 1957;Eaton, 1958) these sources cannot be precisely located. One source may have been northwest of the basin, another near its northeast border, and a third in its southeast part.…”

Section: Upper Sequencementioning

confidence: 99%

“…The eastern facies is widely exposed and attains its maximum known thickness in the northeastern block. Parts of the San Jose Hills exposures have been mapped by Shelton (1946Shelton ( , 1955 and Olmsted (1950), and parts of the Puente Hills exposures have been mapped by Woodford and others (1945), Daviess and Woodford ( 1949) , Durham and Yerkes ( 1959), and Yerkes ( 1960) . The Puente Hills succession south of lat 34° N. has been divided into four named members.…”

Section: Eastern Faciesmentioning

confidence: 99%

“…In the Coyote Hills the exposed part consists of massive silty fine-grained sand and pebbly coarse-grained sand (C. W. Hoskins, unpub. data; Yerkes, 1960) . Along the south margin of the Puente Hills the succession is massive coarse-grained friable sand, pebbly sand, and gravel; at i~s base is about 10 feet of hard pebbly sandstone that contains platy white (upper Miocene) siltstone detritus (Yerkes, 1960).…”

Section: Lower Pleistocene Depositsmentioning

confidence: 99%

“…data; Yerkes, 1960) . Along the south margin of the Puente Hills the succession is massive coarse-grained friable sand, pebbly sand, and gravel; at i~s base is about 10 feet of hard pebbly sandstone that contains platy white (upper Miocene) siltstone detritus (Yerkes, 1960). Near the mouth of the Santa Ana River in the southeast part of the central block are a few exposures of silt, sand, and gravel (Poland, Piper, and others, 1956).…”

Section: Lower Pleistocene Depositsmentioning

confidence: 99%

See 4 more Smart Citations

Geology of the Los Angeles Basin, California — An introduction

Yerkes¹,

McCulloh²,

Schoellhamer³

et al. 1965

Professional Paper

137

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Section: Upper Sequencementioning

confidence: 96%

Section: Upper Sequencementioning

confidence: 99%

Section: Eastern Faciesmentioning

confidence: 99%

Section: Lower Pleistocene Depositsmentioning

confidence: 99%

Section: Lower Pleistocene Depositsmentioning

confidence: 99%

See 3 more Smart Citations

Geology of the Los Angeles Basin, California — An introduction

Yerkes¹,

McCulloh²,

Schoellhamer³

et al. 1965

Professional Paper

137

View full text Add to dashboard Cite

Palynology of the Silverado formation (late Paleocene), riverside and orange counties, California

Gaponoff

1984

Palynology

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A palynological investigation of 24 outcrop samples from Alberbill, Riverside County, and Rancho Mission Viejo, Orange County, California, provided a spore and pollen assemblage of 85 species in 56 genera. The presence of Momipites tenuipolus Anderson and Plicatopollis triradiata (Nichols) Frederiksen & Christopher indicates that the lower member of the Silverado Formation is late Paleocene in age. This refines a previous interpretation of Paleocene age for the Silverado Formation based on megainvertebrate fossils in the upper member.The abundance of fungal and pteridophyte spores and angiosperm pollen indicate a swampy or lowland bog depositional environment within a paralic deltaic system. Caryapollenites, Cupanieidites, Paraalnipollenites, Plicatopollis, and Momipites pollen in the assemblage indicate a warm temperate influence within a prevailing subtropical climate during the deposition of the Silverado Formation.

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A Discussion on volcanism and the structure of the Earth - Cenozoic volcanism and plate-tectonic evolution of the Western United States. II. Late cenozoic

Christiansen

Lipman

1972

Phil. Trans. R. Soc. Lond. A

365

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A major change in volcanic associations and their tectonic settings occurred in much of the Western United States during late Cenozoic time. Where this volcano-tectonic transition can be documented, an earlier orogenic and post-orogenic association of predominantly calc-alkalic andesitic rocks typical of circum-Pacific continental margin and island arcs was succeeded by fundamentally basaltic volcamsm which accompanied regional normal and strike-slip faulting. The igneous fields regarded here as fundamentally basaltic include: (1) basaltic fields, (2) alkalic fields in which differentiated igneous series commonly can be related to alkali-basaltic parent magmas, and (3) bimodal associations of mafic and silicic rocks, generally basalts and high-silica rhyolites. Similar igneous fields occur in other regions of the world characterized by tectonic extension. The nature and timing of the late Genozoic volcano-tectonic transition in various areas of the Western United States are documented from published references. The transition began in the southeastern part of the region in latest Oligocene time and moved northwestward through Miocene, Pliocene, and Quaternary time. The inception of basaltic, alkalic, or bimodal volcanism and associated regional extension of inland areas appears to date the times at which plate-tectonic boundaries between North America and two Pacific plates underwent drastic changes. These changes resulted from collision of the East Pacific Rise with a mid-Tertiary continental-margin trench and resulting direct contact of the American and western Pacific plates along a right-lateral transform fault system. These platetectonic interactions have evolved continuously and have determined the volcanic and tectonic evolution of the Western United States for the last 30 million years.

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

Cited by 7 publications

References 6 publications

Geology of the Los Angeles Basin, California — An introduction

Geology of the Los Angeles Basin, California — An introduction

Palynology of the Silverado formation (late Paleocene), riverside and orange counties, California

A Discussion on volcanism and the structure of the Earth - Cenozoic volcanism and plate-tectonic evolution of the Western United States. II. Late cenozoic

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