J. J. Anderson, P. D. Rowley, M. N. Machette, S. H. Decatur, H. H. Mehnert
1990, IMAP 1999
No abstract available....
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Publication Extents
Not all publications have extents, not all extents are completely accurateC. H. Tibbals
1990, Professional Paper 1403-E
No abstract available....
Conde R. Thorn, G. W. Levings, S. D. Craigg, W. L. Dam, J. M. Kernodle
1990, Hydrologic Atlas 720-E
This report is one in a series resulting from the U.S. Geological Survey's Regional Aquifer-System Analysis (RASA) study of the San Juan structural basin that began in October 1984. Previous reports in the series describe the hydrogeology of the Dakota Sandstone (Craigg and others, 1989), Point Lookout Sandstone (Craigg and...
G.L. Locke
1990, Water-Resources Investigations Report 90-4012
Fort Bend County, which has one of the fastest growing populations of all counties in the United States, is dependent entirely on ground water for public supply. Since 1969, at least 90 large-capacity wells have been drilled, of which 57 were public supply wells, 23 were irrigation wells, and 10...
B. Chouet, H. R. Shaw
1990, Journal of Geophysical Research (96) 10177-10189
Studies the fractal properties of shallow volcanic tremor and gas piston events associated with magma degassing at Kilauea Volcano, Hawaii, using data from two dense short-baseline arrays of seismographs deployed near the active crater of Puu Oo on the east rift of the volcano. The existence of a categorically stable...
Jack B. Hartung, Michael J. Kunk, R. R. Anderson
1990, GSA Special Papers (247) 207-221
A problem with the impact hypothesis for the Cretaceous/Tertiary (K/T) mass extinction is the apparent absence of an identifiable impact site. The Manson impact structure is a candidate site because of its size (the largest such structure recognized in the United States); in addition, the largest and most abundant shocked...
James C. Savage, Michael Lisowski, W.H. Prescott
1990, Geophysical Research Letters (17) 2113-2116
Strain rates measured at four geodetic networks in eastern California situated between northern Owens Valley and the Transverse Ranges along a small circle drawn about the Pacific‐North America pole of rotation are remarkably consistent. Each exhibits 0.14 μrad/yr simple right‐lateral engineering‐shear‐strain accumulation across the local vertical plane tangent to the...
N.K. Huber
1990, GSA Bulletin (102) 102-115
Erosional remnants of volcanic rock deposited in a lO-m.y.-old channel of the Tuolumne River permit its partial reconstruction. Projection of the reconstructed channel west to the Central Valley and east to the range crest, together with several assumptions about the position of the hinge line and changes in channel gradient,...
D.A. Foster, T.M. Harrison, C. F. Miller, Keith A. Howard
1990, Journal of Geophysical Research B: Solid Earth (95) 20005-20024
Mesozoic thickening and Cenozoic extension resulted in the juxtaposition of upper and middle crustal rocks in the eastern Mojave Desert, southeastern California and western Arizona. The application of 40Ar/39Ar thermochronology to rocks in this region provides information about the timing and nature of thrusting, plutonism, metamorphism, denudation, and detachment faulting. The 40Ar/39Ar...
S.P. Nishenko, G. A. Bollinger
1990, Science (249) 1412-1416
Analysis of seismograph network data, earthquake catalogs from 1727 to 1982, and paleoseismic data for the central and eastern United States indicate that the Poisson probability of a damaging earthquake (magnitude ≥ 6.0) occurring during the next 30 years is at a moderate to high level (0.4 to 0.6). When...
Isaac J. Winograd
1990, Environmental Science and Technology (24) 1291-1293
No abstract available....
Jean A. Olson
1990, Geophysical Research Letters (17) 1429-1432
Persistent seismicity occurred at a low rate during at least the twenty years before the Loma Prieta earthquake along the 60 km-long rupture zone. The depth distribution of this seismicity forms a broad “U”-shape that delineates the previously locked rupture zone. Relocations of seismicity during the ten years before the...
Catherine Frazer, Jerry R. Longcore, Daniel G. McAuley
1990, Journal of Wildlife Management (54) 451-459
We examined habitat use by 112 postfledging American black ducks (Anas rubripes) in eastern Maine and southwestern New Brunswick from September through early December of 1985, 1986, and 1987. Ducks were captured on Moosehorn National Wildlife Refuge (NWR), Maine. Palustrine Emergent Wetland was the most preferred habitat type. Riverine habitats...
Kimberly Titus, Mark R. Fuller
1990, Journal of Wildlife Management (54) 463-470
Using simple regression, pooled-sites route-regression, and nonparametric rank-trend analyses, we evaluated trends in counts of hawks migrating past 6 eastern hawk lookouts from 1972 to 1987. The indexing variable was the total count for a season. Bald eagle (Haliaeetus leucocephalus), peregrine falcon (Falco peregrinus), merlin (F. columbarius), osprey (Pandion haliaetus),...
Brian S. Cade, Richard W. Hoffman
1990, Journal of Wildlife Management (54) 471-479
We studied winter use of Douglas-fir (Pseudotsuga menziesii) forests by blue grouse (Dendragapus obscurus) from 1981 to 1983 at 2 study areas in northcentral Colorado. Comparisons of used and available stands indicated grouse were concentrated spatially, but there were no consistent differences related to basal area of tree species, conifer...
W. D. Stanley, Victor F. Labson, Warren J. Nokleberg, Bela Csejtey Jr., M. A. Fisher
1990, GSA Bulletin (102) 160-173
Regional magnetotelluric surveys recently completed across the central and eastern Alaska Range of Alaska provide evidence for large volumes of conductive rocks beneath the core of the range. These conductive rocks may represent a formerly extensive, but now collapsed, Mesozoic flysch basin formed on the leading edge of the Talkeetna...
Kenneth G. Miller, Dennis V. Kent, Andrew N. Brower, Laurel M. Bybell, Mark D. Feigenson, Richard K. Olsson, Richard Z. Poore
1990, GSA Bulletin (102) 331-339
We use magnetostratigraphy and Sr-isotope stratigraphy to improve stratigraphic control for the Eocene to Oligocene of the New Jersey coastal plain (ACGS4 borehole). Magnetostratigraphy in many cases is complicated in outcrop sections of shallow-water (<200 m paleodepth) sediments by low remanence and weathering; we minimize these problems by analyzing large...
J.B. Saleeby, R. W. Kistler, Samuel Longiaru, James G. Moore, Warren J. Nokleberg
1990, GSA Memoirs (174) 251-270
Metamorphosed silicic volcanic and hypabyssal rocks of middle Cretaceous (110 to 100 Ma) age occur in two roof pendants in the Kings Canyon area of the central Sierra Nevada. The metavolcanic remnants are similar in age to or are only slightly older than the voluminous enclosing batholithic rocks. Thus, high...
James G. Moore, D. A. Clague, K.R. Ludwig, R. K. Mark
1990, Journal of Volcanology and Geothermal Research (42) 273-284
Side-looking sonar (GLORIA) mapping has revealed a series of four arcuate bands of high sonic backscatter on the crest of the Haleakala Ridge, a major rift-zone ridge extending 135 km east of the island of Maui. Dredge recovery indicates that the shallowest of these bands is a drowned coral reef,...
J. E. Nielson, Kathi K. Beratan
1990, Journal of Geophysical Research B: Solid Earth (95) 599-614
Colorado River extensional corridor. In the Mohave Mountains and Aubrey Hills of Arizona and the eastern Whipple Mountains of California near Parker Dam, these deposits comprise four unconformity-bounded sequences composed of locally derived epiclastic and volcanic rocks and the Peach Springs Tuff. The three older sequences represent syntectonic units that...
Calvin G. Barnes, Charlotte M. Allen, James D. Hoover, Robert H. Brigham
1990, Book chapter, The nature and origin of Cordilleran magmatism
The Slinkard pluton (SP) and Wooley Creek batholith (WCB) are the lower and upper parts, respectively, of a tilted Middle Jurassic magma system. The SP and lower WCB intruded structurally lower ophiolitic mélange of the Marble Mountain terrane; the upper WCB intruded successively structurally higher metavolcanic and metasedimentary rocks of...
Robert J. Fleck
J. Lawford Anderson, editor(s)
1990, Book chapter, The nature and origin of Cordilleran magmatism
Variations in initial 143Nd/144 Nd in Late Cretaceous plutonic rocks along the South Fork of the Clearwater River (SFCR) supplement results of Sr and O studies, which demonstrate large-scale mixing in magmas forming the western margin of the Idaho batholith. These marginal or border phases of the batholith span the terrane boundary...
Ronald W. Kistler
J. Lawford Anderson, editor(s)
1990, Book chapter, The nature and origin of Cordilleran magmatism
Chemical and isotopic characteristics of plutons in the western United States reflect compositions and protoliths of subjacent source materials. A discontinuously exposed shear zone that extends along the length of the Sierra Nevada in California marks a boundary between two areas manifested geologically by wall-rock and roof-pendant lithologies of different...
Lydia Fox, David M. Miller
J. Lawford Anderson, editor(s)
1990, Book chapter, The nature and origin of Cordilleran magmatism
Jurassic plutons in the east-central Mojave Desert region are markedly different from older and younger Mesozoic plutons in the region. They form a chemically and texturally heterogeneous group that ranges in composition from diorite to syenogranite; some phases are alkalic. Igneous rocks in the southern Bristol Mountains, southern Providence Mountains,...
John H. Stewart, David S. Diamond
Brian P. Wernicke, editor(s)
1990, Book chapter, Basin and Range extensional tectonics near the latitude of Las Vegas, Nevada
The middle and upper Miocene Esmeralda Formation of western Nevada was deposited in a continental basin that crops out over an area of about 2,000 km2. The formation consists of thin, westerly derived sedimentary rocks in the western three-quarters of the outcrop area and of thick (3+ km) easterly derived...