Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2354
Gravity anomalies in the Galapagos Islands area
No abstract available.
Authors
Anthony B. Watts, J. R. Cochran, J. E. Case, S. L. Ryland, Tom Simkin, Keith A. Howard
Geologic sketch of the Klamath Mountains and Coast Ranges of northern California and southern Oregon
No abstract available.
Authors
W. P. Irwin, E.W. Wolfe, M. C. Blake, C.G. Cunningham
Lunar basin formation and highland stratigraphy
Multiring impact basins, formed after solidification of the lunar crust, account for most or all premare regional deposits and structures expressed in the lunar landscape and for major topographic and gravity variations. A fresh basin has two or more concentric mountain rings, a lineated ejecta blanket, and secondary impact craters. Crackled material on the floor may be impact melt. The ejecta bla
Authors
Keith A. Howard, D.E. Wilhelms, D. H. Scott
Report on Circum-Pacific Energy and Mineral Resources Conferences
No abstract available.
Authors
M.T. Halbouty, J.F. Mason, E. E. Brabb
Origin of Franciscan melanges in Northern California
In northern California, chaotic Franciscan melange occurs beneath the overlying ophiolite and Great Valley Sequence. Identical melanges occur to the west, separating well-bedded, coherent Franciscan units that differ markedly in age. Detailed studies in several places indicate that these melanges mark the boundaries of imbricate thrust sheets, and they appear to occur at several discrete structura
Authors
M. Clark Blake, D. L. Jones
K-Ar Age Relations of Granodiorite Emplacement and Tungsten and Gold Mineralization near the Getchell Mine, Humboldt County, Nevada
A granodiorite stock intrudes complexly folded and thrust-faulted Paleozoic sedimentary rocks in the Osgood Mountains of eastern Humboldt County, Nevada. Within the metamorphic aureole surrounding the pluton, the sedimentary rocks are converted to cordierite hornfels and marble; tungsten-bearing tactites developed along the contacts of the granodiorite. Cutting the granodiorite and sedimentary roc
Authors
Miles L. Silberman, B. R. Berger, Randolph A. Koski
Spring mudflows at Wrightwood, Southern California
The Wrightwood area in the San Gabriel Mountains of southern California is known as a site of recurring mudflow activity. The community of Wrightwood is built on the coalesced fans of Sheep, Acorn and Heath Creeks, and the fan deposits are probably chiefly of mudflow origin. Historically, mudflows there have been observed in association with three climatic conditions: (1) short period of high-inte
Authors
D. M. Morton, R. H. Campbell
Preparation and use of isopleth maps of landslide deposits
Isopleth maps derived from landslide inventory maps generalize and quantify the areal distribution of landslide deposits in contour form and may be uniquely useful for some types of regional planning. The isopleth format permits incorporation of landslide information with other quantified map data in the preparation of slope stability maps. The isopleth map of landslide deposits in San Mateo Count
Authors
Robert H. Wright, Russell H. Campbell, Tor H. Nilsen
Alaska
No abstract available.
Authors
E. H. Lathram, Arthur Grantz, D.F. Barnes, David A. Brew, A. Thomas Ovenshine, G. Plafker, R.L. Detterman, H.L. Foster, M. Churkin, W. W. Patton, J. M. Hoare, I.L. Tailleur, W. P. Brosge, T. P. Miller, C.L. Sainsbury
Geologic map of the Pickett Peak quadrangle, Trinity County, California
No abstract available.
Authors
William P. Irwin, M. Clark Blake, C.G. Cunningham
Geologic Exploration of Taurus-Littrow: Apollo 17 Landing Site
Apollo 17 landed in a deep graben valley embaying the mountainous highlands southeast of the Serenitatis basin. Impact-generated breccias underlie the massifs adjacent to the valley, and basalt has flooded and leveled the valley floor. The dark mantle inferred from orbital photographs was not recognized as a discrete unit; the unusually thick regolith of the valley floor contains a unique high con
Authors
W.R. Muehlberger, R. M. Batson, E.A. Cernan, V. L. Freeman, M.H. Haitt, H. E. Holt, Keith A. Howard, K.B. Jackson, V.S. Larson, J.J. Reed, J. J. Rennilson, H.H. Schmitt
Trench exposures across surface fault ruptures associated with the San Fernando earthquake
No abstract available.
Authors
Manuel G. Bonilla