The Lake Elsinore quadrangle covers about 250 square miles and includes parts of the southwest margin of the Perris Block, the Elsinore trough, the southeastern end of the Santa Ana Mountains, and the Elsinore Mountains. The oldest rocks consist of an assemblage of metamorphics of igneous effusive and sedimentary origin, probably, for the most part, of Triassic age. They are intruded by diorite and various hypabyssal rocks, then in turn by granitic rocks, which occupy...

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Field mapping, petrography, U/Pb zircon geochronology, and Rb/Sr geo-chemistry on the crystalline rocks of the southernmost Sierra Nevada and Tehachapi Mountains north of the Garlock fault have 1) generated a structural, geo-chemical, and geochronological framework; 2) demonstrated a continuation of Sierran plutonic and metasedimentary rocks into the Tehachapi Mountains; 3) indicated that the region, in particular...

[Part 1] The Geology of the Pinyon Peak Area, East Tintic Mountains, Utah: In G. F. Loughlin's report of 1919 on the Geology of the Tintic mining district, (Lindgren, Taldemar, and Loughlin, G. F., Geology and Ore Deposits of the Tintic Mining District, Utah: U. S. Geological Survey Prof. Paper 107, 1919), a new formation, the Pinyon Peak limestone, was described and tentatively assigned to Upper (?) Devonian age. This outcrop of limestone on Pinyon...

The southeastern Sierra Nevada consists of three geographic regions. From west to east, they are: an upland region across the crest, a steep east-facing escarpment along which Owens Valley has partly subsided, and foothill blocks intermediate to the Sierra Nevada and Owens Valley. Farther east, Owens Valley is a deep graben separating the Sierra Nevada and the Inyo Range. The main goals of this thesis were the detailed mapping of Quaternary glacial and other deposits...

The Lake Elsinore quadrangle covers about 250 square miles and includes parts of the southwest margin of the Perris Block, the Elsinore trough, the southeastern end of the Santa Ana Mountains, and the Elsinore Mountains. The oldest rocks consist of an assemblage of metamorphics of igneous effusive and sedimentary origin, probably, for the most part, of Triassic age. They are intruded by diorite and various hypabyssal rocks, then in turn by granitic rocks, which occupy...

The Lake Elsinore quadrangle covers about 250 square miles and includes parts of the southwest margin of the Perris Block, the Elsinore trough, the southeastern end of the Santa Ana Mountains, and the Elsinore Mountains. The oldest rocks consist of an assemblage of metamorphics of igneous effusive and sedimentary origin, probably, for the most part, of Triassic age. They are intruded by diorite and various hypabyssal rocks, then in turn by granitic rocks, which occupy...

The Lake Elsinore quadrangle covers about 250 square miles and includes parts of the southwest margin of the Perris Block, the Elsinore trough, the southeastern end of the Santa Ana Mountains, and the Elsinore Mountains. The oldest rocks consist of an assemblage of metamorphics of igneous effusive and sedimentary origin, probably, for the most part, of Triassic age. They are intruded by diorite and various hypabyssal rocks, then in turn by granitic rocks, which occupy...

Titan global map merging VIMS and ISS datasets, details were presented by B. Seignovert et al. at LPSC 2019 and EPSC/DPS 2019 (cf. related identifiers).

The southeastern Sierra Nevada consists of three geographic regions. From west to east, they are: an upland region across the crest, a steep east-facing escarpment along which Owens Valley has partly subsided, and foothill blocks intermediate to the Sierra Nevada and Owens Valley. Farther east, Owens Valley is a deep graben separating the Sierra Nevada and the Inyo Range. The main goals of this thesis were the detailed mapping of Quaternary glacial and other deposits...

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Field mapping, petrography, U/Pb zircon geochronology, and Rb/Sr geo-chemistry on the crystalline rocks of the southernmost Sierra Nevada and Tehachapi Mountains north of the Garlock fault have 1) generated a structural, geo-chemical, and geochronological framework; 2) demonstrated a continuation of Sierran plutonic and metasedimentary rocks into the Tehachapi Mountains; 3) indicated that the region, in particular...

The Origin of Some Chromite Deposits in the Pacific Coast Region: Chromite deposits have long been regarded as products of magmatic segregation. As additional data have become available, other processes have been invoked to account for the observed facts, The writer, in the employ of the U.S. Geological Survey, has visited many of the known chromite localities in the western part of the United States and has collected much field evidence bearing on the problem...

The Origin of Some Chromite Deposits in the Pacific Coast Region: Chromite deposits have long been regarded as products of magmatic segregation. As additional data have become available, other processes have been invoked to account for the observed facts, The writer, in the employ of the U.S. Geological Survey, has visited many of the known chromite localities in the western part of the United States and has collected much field evidence bearing on the problem...

[Part 1] The Geology of the Pinyon Peak Area, East Tintic Mountains, Utah: In G. F. Loughlin's report of 1919 on the Geology of the Tintic mining district, (Lindgren, Taldemar, and Loughlin, G. F., Geology and Ore Deposits of the Tintic Mining District, Utah: U. S. Geological Survey Prof. Paper 107, 1919), a new formation, the Pinyon Peak limestone, was described and tentatively assigned to Upper (?) Devonian age. This outcrop of limestone on Pinyon...

Spurs of the Peninsular Range of Southern California extend southeasterly into the Salton Sink at several places along its western margin, and thus produce a mountain front characterized by deep re-entrant valleys. The origin of these peculiar features has been much discussed, and with this problem in view the present investigation was undertaken. A strip about 15 miles wide across the southern portion of the Indio Quadrangle, extending from the Salton Sea westerly to the...

The Lake Elsinore quadrangle covers about 250 square miles and includes parts of the southwest margin of the Perris Block, the Elsinore trough, the southeastern end of the Santa Ana Mountains, and the Elsinore Mountains. The oldest rocks consist of an assemblage of metamorphics of igneous effusive and sedimentary origin, probably, for the most part, of Triassic age. They are intruded by diorite and various hypabyssal rocks, then in turn by granitic rocks, which occupy...

Part I: The Mazatzal Mountains are located in Gila, Yavapai, and Maricopa counties in central Arizona. The rocks in the central part of this range are dominantly Precambrian, and the only younger stratified rocks are of Tertiary or younger age. The Precambrian rocks have undergone a Precambrian regional metamorphism to lower greenschist grade. Two main mappable units of stratified rocks are present: the Alder series and the Red Rock rhyolite. Previous work (Wilson, 1939) had...

The Origin of Some Chromite Deposits in the Pacific Coast Region: Chromite deposits have long been regarded as products of magmatic segregation. As additional data have become available, other processes have been invoked to account for the observed facts, The writer, in the employ of the U.S. Geological Survey, has visited many of the known chromite localities in the western part of the United States and has collected much field evidence bearing on the problem...

The Origin of Some Chromite Deposits in the Pacific Coast Region: Chromite deposits have long been regarded as products of magmatic segregation. As additional data have become available, other processes have been invoked to account for the observed facts, The writer, in the employ of the U.S. Geological Survey, has visited many of the known chromite localities in the western part of the United States and has collected much field evidence bearing on the problem...

The Jackson Mountains are located in the western Great Basin in Humboldt County, northwest Nevada. The range contains a late Paleozoic to Mesozoic depositional sequence. This sequence records sedimentation, volcanism and deformation in a back-arc setting. The Mississippian to late Early Permian McGill Canyon Formation was deposited in basinal to slope to distal shelf environments, dominated by hemipelagic and turbiditic facies. In the Permian there was an volcanic arc andesite component, and a nearby contemporaneous...

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Field mapping, petrography, U/Pb zircon geochronology, and Rb/Sr geo-chemistry on the crystalline rocks of the southernmost Sierra Nevada and Tehachapi Mountains north of the Garlock fault have 1) generated a structural, geo-chemical, and geochronological framework; 2) demonstrated a continuation of Sierran plutonic and metasedimentary rocks into the Tehachapi Mountains; 3) indicated that the region, in particular...

The San Pedro Hills Area is composed of Basement Complex overlain by a series of late Tertiary and Quaternary marine sediments. There is a series of intrusive rocks forming sills and laccolithic masses in the vicinity of San Pedro Hill. There is a great abundance of fossil material in the very late Tertiary and Quaternary beds, offering ample opportunity for the paleontologist to accurately zone the different formations. The folding is quite acute, but there...

The Lake Elsinore quadrangle covers about 250 square miles and includes parts of the southwest margin of the Perris Block, the Elsinore trough, the southeastern end of the Santa Ana Mountains, and the Elsinore Mountains. The oldest rocks consist of an assemblage of metamorphics of igneous effusive and sedimentary origin, probably, for the most part, of Triassic age. They are intruded by diorite and various hypabyssal rocks, then in turn by granitic rocks, which occupy...

The Lake Elsinore quadrangle covers about 250 square miles and includes parts of the southwest margin of the Perris Block, the Elsinore trough, the southeastern end of the Santa Ana Mountains, and the Elsinore Mountains. The oldest rocks consist of an assemblage of metamorphics of igneous effusive and sedimentary origin, probably, for the most part, of Triassic age. They are intruded by diorite and various hypabyssal rocks, then in turn by granitic rocks, which occupy...

The Origin of Some Chromite Deposits in the Pacific Coast Region: Chromite deposits have long been regarded as products of magmatic segregation. As additional data have become available, other processes have been invoked to account for the observed facts, The writer, in the employ of the U.S. Geological Survey, has visited many of the known chromite localities in the western part of the United States and has collected much field evidence bearing on the problem...

The Origin of Some Chromite Deposits in the Pacific Coast Region: Chromite deposits have long been regarded as products of magmatic segregation. As additional data have become available, other processes have been invoked to account for the observed facts, The writer, in the employ of the U.S. Geological Survey, has visited many of the known chromite localities in the western part of the United States and has collected much field evidence bearing on the problem...