Publications
Here you will find publications, reports and articles produced by Energy and Mineral scientists. For a comprehensive listing of all USGS publications please click the button below.
Filter Total Items: 1168
Impact breccias in carbonate rocks, Sierra Madera, Texas
Two main types of deformational breccia occur in the Sierra Madera cryptoexplosion structure: monolithologic breccias composed of shattered rock of a single lithology and mixed breccias composed of rocks of several lithologies. Monolithologic breccias generally show no mineralogic signs of shock deformation, but a few samples are shatter-coned in a manner suggesting simultaneous formation of brecc
Authors
H. G. Wilshire, Keith A. Howard, Terry W. Offield
Structural implications of an offset Early Cretaceous shoreline in northern California
Recognition of a nonmarine to marine transition in sedimentary rocks at Glade Creek and Big Bar in the southern Klamath Mountains permits reconstruction of the approximate position of a north-trending Early Cretaceous (Valanginian) shoreline. At the southern end of the Klamath Mountains, the shoreline is displaced 60 mi or more to the east by a west-northwest-trending fault zone. South of this fau
Authors
D. L. Jones, W. P. Irwin
The earthquake sequence near Danville, California, 1970
Several thousand small earthquakes, with magnitudes ranging up to 4, occurred near Danville, California, during May, June, and July 1970. Seven temporary seismographs were installed near the epicentral region to augment an existing telemetered network within 1 day after the first felt earthquake. The dense concentration of 10 seismographs within 12 km of the seismic activity and the existence of a
Authors
W. H. K. Lee, M.S. Eaton, E. E. Brabb
Paleozoic metasediments in the northern Ruby Mountains, Nevada
New evidence indicates that high-grade regionally metamorphosed marble and quartzite in the northern Ruby Mountains are Paleozoic strata. Correlation is based on a match of the lithologic sequence to strata of Cambrian to Devonian age in nearby areas; particularly diagnostic is a brown dolomite at the base of the Cambrian carbonate sequence. The metamorphic complex contrasts with unmetamorphosed
Authors
Keith A. Howard
Preliminary geologic map of the Mt. Diablo - Byron area, Contra Costa, Alameda, and San Joaquin Counties, California
No abstract available.
Authors
Earl E. Brabb, H.S. Sonneman, J.R. Switzer
Geologic map of Late Cenozoic deposits, Santa Clara County, California
This map is the first of several in the San Francisco Bay region showing the distribution and differentiation of the late Cenozoic alluvial, estuarine, and volcanic deposits. The sedimentary deposits of gravel, sand, silt, and clay were separated into geologic map units on the basis of their post-depositional soil development, texture, and geomorphology. Some of the geologic units are associated w
Authors
E. J. Helley, E. E. Brabb
Preliminary geologic map of western Sonoma County and northernmost Marin County, California
No abstract available.
Authors
M. C. Blake, R. H. Wright, C. M. Wentworth
Stratigraphy and paleontology of the revised type section for the Tahkandit Limestone (Permian) in east-central Alaska
No abstract available.
Authors
Earl E. Brabb, Richard E. Grant