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Published by the American Geophysical Union as part of the Field Trip Guidebooks Series, Volume 122. This excursion will present an overview of the stratigraphy, structure, and tectonic evolution of the margin of early Mesozoic North America in the Great Basin and of terranes tectonically accreted above and against this margin. Exposures to be visited will show the following features: 1) the Golconda allochthon, a tract of oceanic Paleozoic rocks that was thrust some 100 km across the edge of Triassic North America; 2) shelfal and platformal lower Mesozoic strata that unconformably cover the Golconda allochthon; 3) basinal lower Mesozoic strata that accumulated seaward of the inherited continental edge; 4) Mesozoic and Paleozoic arc volcanics; and 5) Jurassic and Cretaceous foreland structures developed in all the preceding rocks after accretion of terranes had left the early Mesozoic sialic margin well inboard of the active convergent margin. This guide begins with introductions to the neotectonic and Phanerozoic paleotectonic evolutions of the Great Basin. Thereafter, its contents are organized in sequence with field trip stops which are as follows [route map in Figs. 5 and 6]: Day 1. Battle Mt. Golconda allochthon. Day 2. Tobin, Stillwater, and southern Humboldt Ranges. Stratigraphy of platform to basin transition of Triassic cover, Jurassic foreland thrusting; 1915 Pleasant Valley earthquake scarp. Day 3. Sand Springs and Paradise Ranges. Terranes of volcanogenic Triassic and Paleozoic rocks structurally outboard of parautochthonous lower Mesozoic basinal and shelf edge rocks. Days 4 and 5. Mina and Candelaria. North-south traverse across structurally condensed Early Triassic collision zone of exotic Paleozoic arc, Golconda allochthon plus serpentinite melange, Golconda foreland basin strata on Early Triassic North America; these units were covered by Middle and Upper Triassic strata and imbricated with the cover in late Mesozoic foreland thrusting. Day 6. Yerington. Stratigraphy and structure of possibly oldest continental magmatic arc rocks in western Great Basin.
Through a remarkable combination of intellect, self-confidence, engaging humility, and prodigious output of published work, William R. Dickinson influenced and challenged three generations of sedimentary geologists, igneous petrologists, tectonicists, sandstone petrologists, archaeologists, and other geoscientists. A key figure in the plate-tectonic revolution of the 1960s and 1970s, he explained how the distribution of sediments on Earth's surface could be traced to tectonic processes, and is widely recognized as a founder of modern sedimentary basin analysis. This volume consists of 31 chapters related to Dickinson's research interests; many of the authors are his former students, their students, and their students' students, demonstrating his continuing profound influence. The papers in this volume are an impressive tribute to the depth and breadth of Bill Dickinson's contributions to the geosciences.
Demonstrating the multidisciplinary approach currently used to understand Jurassic magmatism and tectonics in western North America, 19 papers report a wealth of new data in the fields of structural geology, igneous petrology and isotope geochemistry, geochronology, sedimentology, and volcanology. T
Wright (geology, U. of Georgia) and Shervais (geology, Utah State U.) edit selections from a symposium titled "Ophiolites, Batholiths, and Regional Geology: A Session in Honor of Cliff Hopson" held at the Cordilleran Section Meeting of The Geological Society of America in 2005. With contributions from geologists and earth scientists from throughout the United States, the title contains separate sections for papers on the topics of ophiolites, arcs, and batholiths. The publication is illustrated in both black-and-white and color, but contains no index.