The 40Ar/39Ar thermochronology of the eastern Mojave Desert, California, and adjacent western Arizona with implications for the evolution of metamorphic core complexes
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...
Forecasting damaging earthquakes in the central and eastern United States
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...
The Yucca Mountain project: Another perspective
Isaac J. Winograd
1990, Environmental Science and Technology (24) 1291-1293
No abstract available....
Seismicity in the twenty years preceding the Loma Prieta California Earthquake
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...
Habitat use by postfledging American black ducks in Maine and New Brunswick
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...
Recent trends in counts of migrant hawks from northeastern North America
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),...
Winter use of douglas-fir forests by Blue Grouse in Colorado
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...
The Denali fault system and Alaska Range of Alaska: Evidence for underplated Mesozoic flysch from magnetotelluric surveys
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...
Eocene-Oligocene sea-level changes on the New Jersey coastal plain linked to the deep-sea record
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...
Chapter 14: Middle Cretaceous silicic metavolcanic rocks in the Kings Canyon area, central Sierra Nevada, California
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...
Subsidence and volcanism of the Haleakala Ridge, Hawaii
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,...
Tertiary basin development and tectonic implications, Whipple Detachment System, Colorado River Extensional Corridor, California and Arizona
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...
Chapter 19: Magmatic components of a tilted plutonic system, Klamath Mountains, California
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...
Chapter 21: Neodymium, strontium, and trace-element evidence of crustal anatexis and magma mixing in the Idaho batholith
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...
Chapter 15: Two different lithosphere types in the Sierra Nevada, California
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...
Chapter 7: Jurassic granitoids and related rocks of the southern Bristol Mountains, southern Providence Mountains, and Colton Hills, Mojave Desert, California
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,...
Chapter 22: Changing patterns of extensional tectonics; Overprinting of the basin of the middle and upper Miocene Esmeralda Formation in western Nevada by younger structural basins
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...
Chapter 10: Shallow crustal deformation in the Pahranagat area, southern Nevada
Angela S. Jayko
Brian P. Wernicke, editor(s)
1990, Book chapter, Basin and Range extensional tectonics near the latitude of Las Vegas, Nevada
The Pahranagat area lies in the Basin and Range Province of southern Nevada. Paleozoic rocks in the study area were folded and faulted during the Sevier orogeny and subsequently extended prior to deposition of Tertiary strata. Middle Oligocene strata overlie the Paleozoic rocks with pronounced angular unconformity and were deposited...
Kidney lesions associated with mortality in chickens inoculated with waterfowl influenza viruses
R.D. Slemons, L. N. Locke, Martha G. Sheerar, R. M. Duncan, Virginia S. Hinshaw, B.C. Easterday
1990, Avian Diseases (34) 120-128
Seventy-six type A influenza viruses recovered from waterfowl in Wisconsin, California, South Dakota, Florida, Texas, Alabama, and Nebraska were tested for virulence in chickens. The challenge to chickens was intravenous inoculation of first-, second-, or third-egg-passage virus. Each of the virus strains was tested separately in three or four chickens....
The California Valley grassland
Jon E. Keeley
Allan A. Schoenherr, editor(s)
1990, Book chapter, Endangered Plant Communities of Southern California: Proceedings of the 15th Annual Symposium
Grasslands are distributed throughout California from Oregon to Baja California Norte and from the coast to the desert (Brown 1982) (Figure 1). This review will focus on the dominant formation in cismontane California, a community referred to as Valley Grassland (Munz 1959). Today, Valley Grassland is dominated by...
Paleogeographic setting of upper Paleozoic rocks in the northern Sierra and eastern Klamath terranes, northern California
David S. Harwood, M. Meghan Miller
1990, Book chapter, Paleozoic and early Mesozoic paleogeographic relations; Sierra Nevada, Klamath Mountains, and related terranes
Upper Paleozoic rocks of the northern Sierra and eastern Klamath terranes provide detailed stratigraphic records of ensimatic arc-related sedimentation and magmatism. Comparison of Paleozoic stratigraphic relations between the two terranes, however, suggests certain contrasts in depositional environments and the nature, volume, and timing of volcanism for given time intervals. Some...
Age and depositional setting of siliceous sediments in the upper Paleozoic Havallah sequence near Battle Mountain, Nevada; Implications for the paleogeography and structural evolution of the western margin of North America
Benita L. Murchey
David S. Harwood, M. Meghan Miller, editor(s)
1990, Book chapter, Paleozoic and early Mesozoic paleogeographic relations; Sierra Nevada, Klamath Mountains, and related terranes
The upper Paleozoic Havallah sequence of central Nevada is a folded and thrust-faulted association of greenstone, siliceous marine sedimentary rocks, and deep-water clastic rocks. Microfossil assemblages (radiolarians, sponge spicules, and conodonts) are used as tools to unravel the stratigraphy and to interpret the paleoenvironments of the siliceous sedimentary rocks. Nine...
Stratigraphy and tectonics of Paleozoic arc-related rocks of the northernmost Sierra Nevada, California; The eastern Klamath and northern Sierra terranes
Angela S. Jayko
David S. Harwood, M. Meghan Miller, editor(s)
1990, Book chapter, Paleozoic and early Mesozoic paleogeographic relations; Sierra Nevada, Klamath Mountains, and related terranes
The Eastern Klamath and Northern Sierra terranes of northern California consist of Devonian to Jurassic arc-related rocks that structurally and/or stratigraphically overlie Devonian(?) or older complexes that consist of quartzite, quartzofeldspathic sandstone, chert, and mafic and ultramafic rocks. These terranes lie within a regional belt of Paleozoic arc-related rocks that...
Ground-water resources of Honey Lake Valley, Lassen County, California, and Washoe County, Nevada
Elinor H. Handman, Clark J. Londquist, Douglas K. Maurer
1990, Water-Resources Investigations Report 90-4050
Honey Lake Valley is a 2,200 sq-mi, topographically closed basin about 35 miles northwest of Reno, Nevada. Unconsolidated basin-fill deposits on the valley floor and fractured volcanic rocks in northern and eastern uplands are the principal aquifers. In the study area, about 130,000 acre- ft of water recharges the aquifer...
Precious metals of Wyoming
W. Dan Hausel
Donald M. Hausen, Douglas N. Halbe, Erich U. Petersen, William J. Tafuri, editor(s)
1990, Conference Paper
Within the State boundaries are numerous gold deposits and anomalies scattered throughout the geological record. Many examples occur in rocks ranging in age from Archean to Tertiary, and in Quaternary to Recent unconsolidated gravels and sands. Yet relatively few of these deposits and anomalies have been explored and only a...
