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Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center

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December 17, 1977

Deposition of the Tapeats Sandstone (Cambrian) in central Arizona Deposition of the Tapeats Sandstone (Cambrian) in central Arizona

Grain size, bedding thickness, dispersion of cross-stratification azimuths, and assemblages of sedimentary structures and trace fossils vary across central Arizona; they form the basis for recognizing six facies (A through F) in the Tapeats Sandstone. Five of these (A through E), present in western central Arizona, are marine deposits containing the trace fossil Corophioides; several...

Authors

Richard Hereford

Geology, Minerals, Energy, and Geophysics Science Center

January 25, 1977

Composition of Pacific Ocean ferromanganese nodules Composition of Pacific Ocean ferromanganese nodules

Bulk composition of ferromanganese nodules from the pelagic environment of the Pacific Ocean is apparently related to nodule-growth rate, sediment-accumulation rate, and biologic productivity in the overlying seawater. Nodules with a high MnFe ratio and high Ni and Cu concentrations tend to occur in areas where primary productivity in the surface layer of the ocean is high and the...

Authors

David Z. Piper, M.E. Williamson

Geology, Minerals, Energy, and Geophysics Science Center

January 1, 1977

Report of status of Reactor Hazards Research Program: fiscal years 1976-1977 Report of status of Reactor Hazards Research Program: fiscal years 1976-1977

The Reactor Hazards Research Program is a Geological Survey program directed at expediting the safe siting and design of power reactors in the United States through topical and regional work on major geological hazards, particularly faulting, earthquake shaking, volcanism, and gross failure of foundation materials (table 1). It is complimentary to the more directed research sponsored by...

Authors

Carl M. Wentworth

Geology, Energy, and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

January 1, 1977

Measured sections of Paleogene rocks from the California coast ranges Measured sections of Paleogene rocks from the California coast ranges

No abstract available.

Authors

Earl E. Brabb, Joseph C. Clark, Constance K. Throckmorton

January 1, 1977

Implications of a magnetic model of the Long Valley caldera, California Implications of a magnetic model of the Long Valley caldera, California

A quantitative magnetic model of Long Valley, California, shows that the magnetic field above this caldera is dominated by intracaldera Bishop tuff, part of the ash flow tuff whose eruption precipitated the caldera collapse. We propose that about half of the 350 km3 of intracaldera Bishop tuff, or that part beneath the resurgent dome, has been subjected to extensive hydrothermal...

Authors

D.L. Williams, F. Berkman, Edward A. Mankinen

January 1, 1977

The landslide hazard in the San Francisco Bay region The landslide hazard in the San Francisco Bay region

Development in hilly or mountainous terrain has resulted in much landslide damage. Areas susceptible to landsliding can be recognized. Practices for minimizing landslides are presented.

Authors

E. E. Brabb