Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2543
Age and correlation of tephra layers, position of the Matuyama-Brunhes chron boundary, and effects of Bishop Ash eruption on Owens Lake, as determined from drill hole OL-92, Southeast California Age and correlation of tephra layers, position of the Matuyama-Brunhes chron boundary, and effects of Bishop Ash eruption on Owens Lake, as determined from drill hole OL-92, Southeast California
Tephra layers in the ~323-m-deep Owens lake drill hole OL-92 correlate to tephra layers that have been identified and dated elsewhere in the western United States. Tephra layers identified are the Bishop ash bed (758 ka) at 309.2–298.6 m; the Dibekulewe (ash) bed (ca. 470 ka to ca. 610 ka) at ~224 m; and one of several ash beds in Walker Lake (ca. 60 ka to ca. 80 ka) at ~50.7 m. Other...
Authors
Andrei M. Sarna-Wojcicki, Charles E. Meyer, Elmira Wan
Mass balance approach to selenium cycling through the San Joaquin Valley, sources to river to bay Mass balance approach to selenium cycling through the San Joaquin Valley, sources to river to bay
Surface and ground waters of the Central Valley of California (e.g., rivers, dams, off-stream storage reservoirs, pumping facilities, irrigation and drinking water supply canals, agricultural drainage canals) are part of a hydrologic system that makes up a complex ecosystem extending from the riparian wetlands of the Sacramento and San Joaquin Rivers through the San Francisco Bay/Delta...
Authors
Theresa S. Presser, David Z. Piper
Seasonal variation in metal concentrations in a stream affected by acid mine drainage, St. Kevin Gulch, Colorado Seasonal variation in metal concentrations in a stream affected by acid mine drainage, St. Kevin Gulch, Colorado
Mining of mineral deposits in the Rocky Mountains has left a legacy of acidic inflows to otherwise pristine upland watersheds. Since 1986, the U.S. Geological Survey has studied physical, chemical, and biological processes that affect the transport and transformation of metals in St. Kevin Gulch, an acidic, metal-rich stream near Leadville, Colorado. Well-known chemical processes have...
Authors
B. A. Kimball
Preliminary geologic map of the Hollywood 7.5' quadrangle, Southern California: A digital database Preliminary geologic map of the Hollywood 7.5' quadrangle, Southern California: A digital database
This Open-File report is a digital geologic map database. This pamphlet serves to introduce and describe the digital data. There is no paper map included in the Open-File report. This digital map database is compiled from previously published sources combined with some new mapping and modifications in nomenclature. The geologic map database delineates map units that are identified by...
Authors
R. F. Yerkes, S. E. Graham
Geology of Point Reyes National Seashore and vicinity, California: A digital database Geology of Point Reyes National Seashore and vicinity, California: A digital database
This Open-File report is a digital geologic map database. This pamphlet serves to introduce and describe the digital data. There is no paper map included in the Open-File report. The report does include, however, a PostScript plot file containing an image of the geologic map sheet with explanation, as well as the accompanying text describing the geology of the area. For those interested...
Authors
Jospeh C. Clark, Earl E. Brabb
Field guide for a GEOMAR & University of Kiel trip across the accreted terranes of the southern Klamath Mountains, California, June 14, 1997 Field guide for a GEOMAR & University of Kiel trip across the accreted terranes of the southern Klamath Mountains, California, June 14, 1997
No abstract available.
Authors
W. P. Irwin
Use of a neural network to integrate geoscience information in the classification of mineral deposits and occurrences Use of a neural network to integrate geoscience information in the classification of mineral deposits and occurrences
No abstract available.
Authors
Donald A. Singer, Ryoichi Kouda
Preliminary geologic map of the Little Piute Mountains, California: A digital database Preliminary geologic map of the Little Piute Mountains, California: A digital database
The Little Piute Mountains Digital database contains digital geologic and geographic information for the study area. The geology was mapped at a scale of 1:8,000, and the topographic information was input from the Little Piute Mountains, CA 1:24,000 quadrangle. The accuracy of the spatial information is limited to the input scale. Postscript files, originally published in paper format as...
Authors
Keith A. Howard, Michael L. Dennis, Karl Karlstrom, Geoffrey A. Phelps
Geologic map of Santa Cruz County, California: A digital database Geologic map of Santa Cruz County, California: A digital database
No abstract available.
Authors
S. Graham, C. Wentworth, D. Knifong, R. Graymer, J. Blissenbach
Summary distribution of slides and earth flows in the San Francisco Bay region, California Summary distribution of slides and earth flows in the San Francisco Bay region, California
No abstract available.
Authors
Carl M. Wentworth, Scott E. Graham, Richard J. Pike, Gregg S. Beukelman, David W. Ramsey, Andrew D. Barron
Map showing principal debris-flow source areas in the San Francisco Bay region, California Map showing principal debris-flow source areas in the San Francisco Bay region, California
No abstract available.
Authors
Stephen D. Ellen, Robert K. Mark, Gerald F. Wieczorek, Carl M. Wentworth, David W. Ramsey, Thomas E. May
Coseismic deformation during the 1989 Loma Prieta earthquake and range-front thrusting along the southwestern margin of the Santa Clara Valley, California Coseismic deformation during the 1989 Loma Prieta earthquake and range-front thrusting along the southwestern margin of the Santa Clara Valley, California
Damage patterns caused by the 1989 Loma Prieta earthquake along the southwestern margin of the Santa Clara Valley, California, form three zones that coincide with mapped and inferred traces of range-front thrust faults northeast of the San Andreas fault. Damage in these zones was largely contractional, consistent with past displacement associated with these faults. The damage zones...
Authors
V.E. Langenheim, K. M. Schmidt, R.C. Jachens