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Page 2540, results 63476 - 63500

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Isotopic dating of Meso- and Neoproterozoic mafic magmatism in the southern Tobacco Root Mountains, Southwestern Montana
Stephen S. Harlan, Wayne R. Premo, D. Unruh, J. W. Geissman
2005, Precambrian Research (136) 269-281
New isotopic dating of mafic dikes in the southern Tobacco Root Mountains of southwestern Montana provides evidence for two distinct episodes of subparallel Proterozoic mafic magmatism separated by about 700 m.y. Previously published geochemical data from dikes in the southern Tobacco Root Mountains had identified three geochemical groups (termed groups A,...
Paleoceanographic history of the Guaymas Basin, Gulf of California, during the past 15,000 years based on diatoms, silicoflagellates, and biogenic sediments
John A. Barron, David Bukry, Walter E. Dean
2005, Marine Micropaleontology (56) 81-102
High-resolution records of calcium carbonate, biogenic opal, diatoms, and silicoflagellates from western Guaymas Basin gravity core GGC55 and piston core JPC56 and eastern Guaymas Basin DSDP Site 480 reveal a complex paleoceanographic history of the central Gulf of California during the past 15,000 years. Prior to ∼ 6.2 ka, the eastern...
Ground water to surface water: Chemistry of thermal outflows in Yellowstone National Park
D. Kirk Nordstrom, James W. Ball, R. Blaine McCleskey
2005, Book chapter, Geothermal biology and geochemistry in Yellowstone National Park
Geothermal waters in the earth’s subsurface boil with steam separation and may mix with dilute ground waters (that may or may not contain sulfuric acid from sulfur oxidation), resulting in a wide range of compositions when they discharge and emerge at the surface. As they discharge onto the ground surface...
Implications of volcanism in coastal California for the Neogene deformation history of western North America
Douglas S. Wilson, Patricia A. McCrory, Richard G. Stanley
2005, Tectonics (24)
The geologic record of coastal California includes evidence of numerous volcanic centers younger than 30 Ma that do not appear to have erupted in an arc setting. By correlating these volcanic centers with specific slab windows predicted from analysis of magnetic anomalies on the Pacific plate, we add new constraints...
A fresh look at the taxonomy of midcontinental sandhill cranes
Douglas H. Johnson, Jane E. Austin, Jill A. Shaffer
2005, Conference Paper, Proceedings of the Ninth North American Crane Workshop
The midcontinental population of sandhill crane (Grus canadensis) includes about 500,000 birds and provides valuable recreational crane-watching and hunting opportunities in Canada and the United States. It comprises three subspecies, one of which (G. c. rowani) was of uncertain taxonomic status and another of which (G. c. tabida) merited protection...
Petrologic constraints on the thermal structure of the Cascades arc
William P. Leeman, Jared F. Lewis, Russell C. Evarts, Richard M. Conrey, Martin J. Streck
2005, Journal of Volcanology and Geothermal Research (140) 67-105
Primitive late Cenozoic basaltic lavas from the Cascades volcanic arc near latitude 46°N comprise two distinct compositional groups. Group I includes samples with low Ba/Nb (<20) and other compositional similarities to oceanic island and MORB lavas from within-plate settings. In contrast, Group II exhibits enrichment of Ba and large-ion lithophile...
Liquefaction induced by historic and prehistoric earthquakes in western Puerto Rico
Martitia P. Tuttle, Kathleen Dyer-Williams, Eugene S. Schweig, Carol S. Prentice, Juan Carlos Moya, Kathleen Tucker
Paul Mann, editor(s)
2005, Book chapter, Active tectonics and seismic hazards of Puerto Rico, the Virgin Islands, and offshore areas
Dozens of liquefaction features in western Puerto Rico probably formed during at least three large earthquakes since A.D. 1300. Many of the features formed during the 1918 moment magnitude (M) 7.3 event and the 1670 event, which may have been as large as M 7 and centered in the Añasco...
1970's Land use data refined with 1990 population data to indicate new residential development for the conterminous United States
Water Resources Division, U.S. Geological Survey
2005, Report
This data set represents U.S. Geological Survey (USGS) historical Land Use and Land Cover (LULC) from the 1970's that has been refined with 1990 population density at the block group level to indicate new residential development representative of the 1990's. Any area having a population density of at least...
Comparative phytosociological investigation of subalpine alder thickets in southwestern Alaska and the North Pacific
Stephen S. Talbot, Sandra L. Talbot, F. J. A. Daniels
2005, Report
We present the first vegetation analysis of subalpine alder (Alnus viridis) thickets in southwestern Alaska. The data are primarily from mesic, hilly and mountainous sites ranging from the westernmost tip of the Alaska Peninsula to the northern Kenai Peninsula, spanning 1,000 km on an E–W gradient and 700 km on...
1970's Land use data refined with 2000 population data to indicate new residential development for the conterminous United States
Water Resources Division, U.S. Geological Survey
2005, Report
This data set represents U.S. Geological Survey (USGS) historical Land Use and Land Cover (LULC) from the 1970's that has been refined with 2000 population density at the block group level to indicate new residential development representative of the early 2000's. Any area having a population density of at...
Sediment-hosted lead-zinc deposits: A global perspective
David L. Leach, Donald F. Sangster, Karen D. Kelley, Ross R. Large, G. Garven, Cameron R. Allen, J. Gutzmer, Steve Walters
2005, Book chapter, Economic geology: One hundredth anniversary volume
Sediment-hosted Pb-Zn deposits contain the world’s greatest lead and zinc resources and dominate worldproduction of these metals. They are a diverse group of ore deposits hosted by a wide variety of carbonate andsiliciclastic rocks that have no obvious genetic association with igneous activity. A range of ore-forming processes in a...
Forestry practices and aquatic biodiversity: Fish
Robert E. Gresswell
2005, Technical Bulletin 908
In the Pacific Northwest, fish communities are found in a diverse array of aquatic habitats ranging from the large coastal rivers of the temperate rainforests, to the fragmented and sometimes ephemeral streams of the xeric interior basins, and high-elevation streams and lakes in the mountainous areas (Rieman et al. 2003)....
Magnetic equator
Jeffrey J. Love
2005, Book chapter, World Book Encyclopedia
No abstract available....
Quebrada Tacahuay, southern Peru: A Late Pleistocene site preserved by a debris flow
Susan D. deFrance, David K. Keefer
2005, Journal of Field Archaeology (30) 385-399
Here we describe the properties of a debris flow apparently generated by a warm phase El Niño event that buried an intermittently occupied Late Pleistocene forager site located in the southern coastal desert of Peru. Although the event deposited roughly one meter of sediment over the initial occupation, our analyses...
Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team, 2004
Charles C. Schwartz, Mark A. Haroldson, Karrie K. West, editor(s)
2005, Report
The contents of this Annual Report summarize results of monitoring and research from the 2004 field season. The report also contains a summary of nuisance grizzly bear (Ursus arctos horribilis) management actions. The study team continues to work on issues associated with counts of unduplicated females with cubs-of-the-year (COY). These counts...