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Page 3925, results 98101 - 98125

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Cenozoic giant pectinids from California and the Tertiary Caribbean Province: Lyropecten, "Macrochlamis," Vertipecten, and Nodipecten species
Judith Terry Smith
1991, Professional Paper 1391
Tertiary pectinids recognized for more than 125 years by field geologists can now be used to date and correlate 3-4 m.y. increments of the geologic record and to determine faunal distributions in relation to tectonic terranes. Fossil pectinids are commonly preserved in shallowmarine clastic deposits that mostly lack microfossils. The...
The Cenozoic evolution of the San Joaquin Valley, California
J. Alan Bartow
1991, Professional Paper 1501
The San Joaquin Valley, which is the southern part of the 700-km-long Great Valley of California, is an asymmetric structural trough that is filled with a prism of upper Mesozoic and Cenozoic sediments up to 9 km thick; these sediments rest on crystalline basement rocks of the southwestward-tilted Sierran block....
Geochemistry of ground water in alluvial basins of Arizona and adjacent parts of Nevada, New Mexico, and California
Frederick N. Robertson
1991, Professional Paper 1406-C
Chemical and isotope analyses of ground water from 28 basins in the Basin and Range physiographic province of Arizona and parts of adjacent States were used to evaluate ground-water quality, determine processes that control ground-water chemistry, provide independent insight into the hydrologic flow system, and develop information transfer. The area...
Geohydrology of Mesozoic rocks in the upper Colorado River basin in Arizona, Colorado, New Mexico, Utah, and Wyoming, excluding the San Juan Basin
Geoffrey W. Freethey, Gail E. Cordy
1991, Professional Paper 1411-C
The purpose of this report is to provide a quantitative analysis of the occurrence, movement, and quality of water and the hydrologic characteristics of aquifers and confining units in the Mesozoic rocks of the Upper Colorado River Basin. The analysis is regional in scope and, hence, does not address site-specific...
The Conterminous United States Mineral Appraisal Program; background information to accompany folio of geologic, geochemical, geophysical, and mineral resources maps of the Tonopah 1 by 2 degree Quadrangle, Nevada
David A. John, J. T. Nash, Donald Plouff, D. H. Whitebread
1991, Circular 1070
The Tonopah 1 ? by 2 ? quadrangle in south-central Nevada was studied by an interdisciplinary research team to appraise its mineral resources. The appraisal is based on geological, geochemical, and geophysical field and laboratory investigations, the results of which are published as a folio of maps, figures, and tables,...