Publications
Filter Total Items: 2670
Minimum earthquake magnitude associated with coseismic surface faulting
No abstract available.
Authors
Manuel G. Bonilla
Pb isotopic evidence for the formation of Proterozoic crust in the southwestern United States
No abstract available.
Authors
J. L. Wooden, J. S. Stacey, Keith A. Howard, B. R. Doe, D. M. Miller
New and revised lithostratigraphic units from the southwestern New England Fold Belt
New and revised lithostratigraphic units are recognized in northern New South Wales. New lithostatigraphic units are: Cara Formation, Whitlow Formation, Bobs Creek Formation, Nangahrah Formation, and Dinoga Formation. Revision of the Woolomin beds to Woolomin Group and Woodsreef Melange is proposed.
Authors
M. Clark Blake, B. Murchey
Metamorphic and tectonic evolution of the Franciscan Complex, northern California: Chapter 38
No abstract available.
Authors
M. Clark Blake, A. S. Jayko, R. J. McLaughlin, M. B. Underwood
Reconnaissance geologic map of the Pilot Creek Quadrangle, Humboldt and Trinity counties, California
No abstract available.
Authors
K. R. Aalto, William Porter Irwin, H.M. Kelsey
A guide to commonly used map projections prepared for use in HyperCard, 1988
This guide briefly describes and illustrates the characteristics of 17 map projections commonly used to present thematic data. By means of simple sketches of the basic grid system of longitude and latitude known as the Earth's graticule, the guide shows examples of the following categories of map projections: planes (azimuthal), cones, cylinders, and miscellaneous. The text gives examples of thema
Authors
Tau Rho Alpha, Joe F. Vigil, Lauren Buchholz
Models of grades and tonnages of some lode tin deposits
Descriptive and grade/tonnage models have recently been built for many types of deposits. Such models consist of descriptions of mineralogy, host rocks, ore textures, controls, alteration, geochemical signatures, age, and tectonic settings, together with statistical models of grades, tonnages, and contained metal of deposits of each type. The models are used to identify areas that may contain undi
Authors
W. D. Menzie, B.L. Reed, Donald A. Singer
The relative contribution of accretion, shear, and extension to Cenozoic tectonic rotation in the Pacific Northwest
Large Cenozoic clockwise rotations defined by paleomagnetic data are an established fact in the Pacific Northwest, and many tectonic models have been proposed to explain them, including (1) rotation of accreted oceanic microplates during docking, (2) dextral shear between North America and northward-moving oceanic plates to the west, and (3) microplate rotation in front of an expanding Basin and R
Authors
Ray E. Wells, Paul L. Heller
Integrating spatial and frequency information in the search for kuroko deposits of the Hokuroku District, Japan
A new method (FINDER) that uses the area of influence and Bayesian statistics to aid in selection of target areas on the basis of one or more variables and multiple observations was tested with drill hole data. A previously defined bimodal distribution of Na 2 O with the low sodium group confined to a 1.5 X 3.0-km zone beneath the cluster of deposits at Fukazawa was used as a control area for one
Authors
Donald A. Singer, Ryoichi Kouda
Paleomagnetic results from the Shasta Bally Plutonic Belt in the Klamath Mountains Province, northern California
Available paleomagnetic data show approximately 100° of clockwise rotation for Permian and Triassic strata of the Eastern Klamath terrane. Jurassic strata of this terrane are rotated approximately 60° clockwise, which is comparable to rotations reported for Jurassic plutons that occur elsewhere in the Klamath Mountains province. Paleomagnetic data obtained during the present study from the Shasta
Authors
Edward A. Mankinen, William P. Irwin, C. Sherman Grommé
Geologic map and structure sections of the Loma Prieta 7 1/2' quadrangle, Santa Clara and Santa Cruz Counties, California
No abstract available.
Authors
Robert J. McLaughlin, Joseph C. Clark, Earl E. Brabb