Download or read book Provenance Evolution of the Late Cretaceous middle Eocene Gualala Basin California written by Ronald C. Schott and published by . This book was released on 2000 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Provenance Characteristics of the Late Cretaceous Early Tertiary Gualala Basin and Implications for the Evolution of the San Andreas Fault written by Ronald Schott and published by . This book was released on 1993 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of Sandstone Provenance in the Gualala Basin CA written by Benjamin N. Bymers and published by . This book was released on 2004 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geology and Tectonics of the Gualala Block Northern California written by and published by . This book was released on 1998 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cenozoic Basin Development of Coastal California written by Raymond V. Ingersoll and published by Prentice Hall. This book was released on 1987 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Provenance of the Paleogene Goler Formation Southern California and Implications for Basin Development in the Southwestern US Cordillera written by David Julien Stone and published by . This book was released on 2021 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Paleogene Goler Formation, located east of the southern Sierra Nevada and north of the Garlock Fault, is one of the only basins in the southwestern US Cordillera that preserves early Cenozoic strata and uniquely records tectonic changes along the margin at that time. This study combines new and previously published detrital zircon (DZ) U-Pb analyses to evaluate temporal changes in provenance of the Goler Formation. The Goler Formation comprises about 3.5 km (stratigraphic thickness) of mainly siltstones, sandstones, and conglomerates. The lowest ~800m of strata reflect a complex age spectra dominated by Permian and Triassic peaks (241 and 253 Ma). The middle of the formation (~1200 - 2300 m) is dominated by Middle to Late Jurassic grains (87 - 93%) with a peak age of ca. 165 Ma. The remaining grains have Late Cretaceous ages (100 - 85 Ma). At about 2300 m of stratigraphic thickness a provenance change is recorded where the proportion of Late Cretaceous (87 - 100 Ma) grains increases (up to 35%), and age spectra become more complex; Middle to Late Jurassic grains span a broader range of ages (175 - 145 Ma) and additional subordinate Late Triassic - Early Jurassic populations (peak ages of ca. 195 Ma) are observed. Collectively, these DZ data suggest derivation of the lower Goler Formation from local El Paso Mountain and Argus Range sources to the east, transitioning through time to mixed-source which included the Sierra Nevada and Coso Range. These results align with a model of the Goler Basin forming in a Paleogene supra-detachment basin where provenance was limited to the hanging wall early in its history but switched to a mixed provenance as the footwall (Sierra Nevada) was exhumed.

Download or read book Place of Origin of the Salinian Block California as Based on Clast Compositions of Upper Cretaceous and Lower Tertiary Conglomerates written by Victor M. Seiders and published by . This book was released on 1992 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Upper Cretaceous and Lower Tertiary Rocks of the Gualala Area Northern Coast Ranges California written by Carl M. Wentworth and published by . This book was released on 1966 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Provenance of Miocene Strata of the El Paso Basin Southern California written by Bret Desmond Sample and published by . This book was released on 2019 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detrital zircon U-Pb and Hf analyses of Miocene strata in the El Paso Basin provide new constraints on the paleogeography of the northern Mojave and southern Sierra Nevada region. The El Paso Basin is located between the fault-bounded southeastern flank of the Sierra Nevada and the northern margin of the Mojave Desert, which is bounded by the Garlock fault and the El Paso Mountains immediately north of it. Due to its unique location, El Paso Basin strata can record important indicators of tectonic activity in surrounding basement blocks and geologic structures. Basin strata consist of the Paleogene Goler Formation and overlying Miocene Ricardo Group, made up of the volcaniclastic Cudahy Camp Formation and fluvio-lacustrine Dove Spring Formation. A sandstone near the base of the Cudahy Camp Fm yielded a unimodal detrital zircon U-Pb peak age of ca. 250 Ma, indicating local sourcing from the Permian-Triassic El Paso Mountains. Higher in the section, a sandstone from the upper Cudahy Camp Fm yielded a unimodal DZ peak age of ca. 18 Ma. That age supports previous correlation of the Cudahy Camp Fm with the Eagle Crags Volcanic Field, which is south of the Garlock fault and now offset ~64 km to the northeast. The lower Dove Spring Formation is dominated by locally derived boulder and pebble conglomerate with 14 Ma DZ age peaks. The sediment texture, DZ age population, and north-directed paleocurrents indicate local sourcing from the northern Mojave, likely the Lava Mountains area. Higher in the Dove Spring Formation, there is an abrupt change in provenance at ca. 12 Ma marked by the influx of Cretaceous zircon grains with ages ranging from ca. 124-74 Ma and dominant age peaks at ca. 88 Ma. Plutons with ages of 110-85 are characteristic of the voluminous Late Cretaceous Sierra Nevada batholith, but are also abundant throughout much of the Mojave block, making provenance ambiguous based on DZ age alone. Hf isotope analyses of dated detrital zircon grains were performed in order to help distinguish between source areas with overlapping U-Pb ages. Initial eHf values in Late Cretaceous detrital zircons range from -10.7 to +7.1, generally becoming more negative through time. Based on available basement geochronology and isotope data, most of these grains are interpreted to derive from the southeastern Sierra Nevada, though derivation of some of these grains from sources in the Mojave Block cannot be precluded. Analysis of detrital zircons in the El Paso Basin leads to the following interpretations: 1) basin development rejuvenated in the Early Miocene marked by deposition of the Cudahy Camp Formation in response to uplift of the El Paso Mountains and possible normal movement on a nascent Garlock fault; 2) the provenance of sediment was north-directed through the middle Miocene from volcanic centers south of the Garlock fault; 3) left-lateral slip on the Garlock fault activated by 12.5 Ma, providing the Lava Mountains a pathway to the El Paso Basin; and 4) the arrival of Late Cretaceous zircons between ca. 12-10 Ma suggests uplift of the southern Sierra Nevada, perhaps via activation of normal movement on the Sierra Nevada Frontal fault system; consistent with Late Cenozoic uplift models, but 2-7 m.y. earlier than previous estimates.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2000 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Cenozoic Evolution of the San Joaquin Valley California written by J. Alan Bartow and published by . This book was released on 1991 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Doctoral Dissertations written by and published by . This book was released on 1999 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Great American Biotic Interchange written by Francis G. Stehli and published by Springer. This book was released on 1985-10-31 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two rather different elements combine to explain the origin of this volume: one scientific and one personal. The broader of the two is the scientific basis-the time for such a volume had arrived. Geology had made remarkable progress toward an understanding of the phys ical history of the Caribbean Basin for the last 100 million years or so. On the biological side, many new discoveries had elucidated the distributional history of terrestrial orga nisms in and between the two Americas. Geological and biological data had been combined to yield the timing of important events with unprecedented resolution. Clearly, when each of two broad disciplines is making notable advances and when each provides new insights for the other, the rewards of cross-disciplinary contacts increase exponentially. The present volume represents an attempt to bring together a group of geologists, paleontologists and biologists capable of exploiting this opportunity through presentation of an interdisciplinary synthesis of evidence and hypothesis concerning interamerican connections during the Cretaceous and Cenozoic. Advances in plate tectonics form the basis for a modern synthesis and, in the broadest terms, dictate the framework within which the past and present distributions of organisms must be interpreted. Any scientific dis cipline must seek tests of its conclusions from data outside of its own confines.

Download or read book Upper Cretaceous Depositional Systems Southern California northern Baja California written by Patrick L. Abbott and published by . This book was released on 1984 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Late Cretaceous Depositional Environments and Paleogeography Santa Ana Mountains Southern California written by David J. Bottjer and published by . This book was released on 1982 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Provenance Study of Cenozoic Palaeodeltaic Sediments in California as a Tool for Understanding the Evolution of the Colorado River written by Paula J. Robinson and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A literature review shows how uplift of the Colorado Plateau and development of the San Andreas transform boundary had significant consequences for evolution of the Colorado River. The San Andreas Fault in southern California is responsible for the dextral lateral migration of the Los Angeles Basin and Salton Trough (both on the Pacific Plate) at least from Middle Eocene through Present. The Colorado River, which drains much of the western part of the North American Plate, crossed this major strike-slip plate boundary prior to deposition of the main part of its sedimentary load. The delta of the Colorado is in the v northern Gulf of California at the present day, but palaeo-reconstructions of lateral displacement along the fault show that the Salton Trough lay adjacent to the point where the Colorado River crossed from the North American Plate (at about 5.33 Ma). It is also possible that at about 18 Ma, at the time of fault initiation, the Los Angeles Basin was at the same point. The study uses heavy mineral analysis (HMA) and associated techniques to test the hypothesis that an ancestral Colorado River supplied sediment both to the Los Angeles Basin and the Salton Trough. Analysis of HMA data suggests a broadly similar source for some of the sediment in the two basins, and for the modern river. The data also indicate changes in the catchment area, suggesting that the Colorado River became fully integrated across the Colorado Plateau by the early Pliocene.

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, SIld disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna and broader dissemination. tional publishing house to assure improved service Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 30 (thesis year 1985) a total of 12,400 theses titles from 26 Canadian and 186 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work.