Effort explores 130 Million years of Antarctic paleoenvironment
Yngve Kristoffersen, I.D. Goodwin, Alan K. Cooper
2000, Eos, Transactions, American Geophysical Union (81) 36-37
Antarctic climate history has been dominated by events and turning points with causes that are poorly understood. To fill the gaps in our knowledges new effort is underway in the international geologic community to acquire and coordinate the circum‐Antarctic geologic data needed to derive and model paleoenvironments of the past...
A new look at natural disasters
T.A. Cohn, K.K. Gohn
2000, News and Trends in the Geosciences (45) 18-21
We are paying a high price for the way we live on our beautiful but dangerous planet. Last year the world experienced deadly earthquakes in Turkey, Taiwan, Colombia and Greece; floods and devastating landslides in Venezuela; hurricanes along the Atlantic Coast that forced evacuation of millions; and numerous smaller disasters....
Response of bird communities to natural disturbance
Michael P. Guilfoyle, Wylie C. Barrow Jr., Paul B. Hamel, James S. Wakely, Sammy L. King, T. J. Antrobus
2000, Book chapter, The Coosawhatchie Bottomland Ecosystem Study: a report on the development of a reference wetland
No abstract available....
Water quality
Terry L. Maluk, Thomas A. Abrahamsen, Richard H. Day
2000, Book chapter, The Coosawhatchie Bottomland Ecosystem Study: a report on the development of a reference wetland
No abstract available....
Primary food resources in the Sacramento-San Joaquin Delta
Alan D. Jassby, James E. Cloern
2000, Interagency Ecological Program Newsletter (13) 21-25
The Sacramento-San Joaquin River Delta, a complex mosaic of tidal freshwater habitats, is now a focus of ecosystem rehabilitation because of changes in critical functions associated with its geographic location at the landestuary interface. One of these functions is the production, transport, and transformation of organic matter that constitutes the...
Geographic signatures of North American West Coast estuaries
Robert Emmett, Roberto Llanso, Jan Newton, Ron Thom, Michelle Hornberger, Cheryl Morgan, Colin Levings, Andrea Copping, Paul Fishman
2000, Estuaries (23) 765-792
West Coast estuaries are geologically young and composed of a variety of geomorphological types. These estuaries range from large fjords to shallow lagoons; from large to low freshwater flows. Natural hazards include E1 Niños, strong Pacific storms, and active tectonic activity. West Coast estuaries support a wide range of living...
Implications of celsian in the Ruby Mountains, Elko County, Nevada
Vladimir Berger, Ted G. Theodore, Richard M. Tosdal, Robert L. Oscarson
2000, Conference Paper, Geology and ore deposits 2000: The Great Basin and Beyond: Symposium proceedings
The Ba-feldspar celsian [BaAl2Si2O8] has been found in quartz-skarn-sulfide deposits at the American Beauty and Summit View Mines in the Ruby Mountains, Nevada. The celsian is present in quartz-skarn-polymetallic sulfide ores formed during Jurassic and Tertiary phases of skarn formation. Well-shaped microcrystals of celsian, along with sulfide minerals and apatite,...
Changes in North Atlantic deep-sea temperature during climatic fluctuations of the last 25,000 years based on ostracode Mg/Ca ratios
Gary S. Dwyer, Thomas M. Cronin, Paul A. Baker, Julio Rodriguez-Lazaro
2000, Geochemistry, Geophysics, Geosystems (1)
We reconstructed three time series of last glacial-to-present deep-sea temperature from deep and intermediate water sediment cores from the western North Atlantic using Mg/Ca ratios of benthic ostracode shells. Although the Mg/Ca data show considerable variability (“scatter”) that is common to single-shell chemical analyses, comparisons between cores, between core top...
Use of multi-date Landsat TM imagery to map Eastern hemlock (Tsuga canadensis) decline due to hemlock woolly adelgid (Adelges tsugae) in Shenandoah National Park
David D. Morton, John A. Young, Nissa M. Thomsen
2000, General Technical Report NE-267
No abstract available....
The August 17, 1999 Kocaeli, Turkey earthquake: a lesson for California?
T.L. Holzer
2000, California Geology (53) 4-16
No abstract available....
Detrital zircon geochronology of Neoproterozoic to Middle Cambrian miogeoclinal and platformal strata: northwest Sonora, Mexico
Essa L. Gorss, John H. Stewart, George E. Gehrels
2000, Geofisica Internacional (39) 295-308
Eighty-five detrital zircon grains from Mesoproterozoic and/or Neoproterozoic to Middle Cambrian sedimentary strata in northwest Sonora, Mexico, have been analyzed to determine source terranes and provide limiting depositional ages of the units. The zircon suites from the Mesoproterozoic and/or Neoproterozoic El Alamo Formation and El Aguila unit yield ages between 1.06 Ga and...
Self-ordering and complexity in epizonal mineral deposits
Richard W. Henley, Byron R. Berger
2000, Annual Review of Earth and Planetary Sciences (28) 669-719
Epizonal base and precious metal deposits makeup a range of familiar deposit styles including porphyry copper-gold, epithermal veins and stockworks, carbonate-replacement deposits, and polymetallic volcanic rock-hosted (VHMS) deposits. They occur along convergent plate margins and are invariably associated directly with active faults and volcanism. They are complex in form, variable...
Vertical accretion versus elevational adjustment in UK saltmarshes: An evaluation of alternative methodologies
Donald R. Cahoon, Jonathan R. French, Thomas Spencer, Denise Reed, Iris Moller
2000, Book chapter, Coastal and Estuarine Environments: Sedimentology, Geomorphology and Geoarchaeology
Simultaneous measurements of vertical accretion from marker horizons and marsh-elevation change from sedimentation-erosion tables (SET) were made in selected marshes along the East Anglian coast of the UK in order to address the following objectives:to ascertain the validity of treating accretion measurements obtained within tidally dominated, minerogenic saltmarshes...
Oil–bearing rocks of the Davenport and Point Reyes areas and their implications for offset along the San Gregorio and northern San Andreas faults
Richard G. Stanley, Paul G. Lillis
G. H. R. Bokelmann, R. L. Kovach, editor(s)
2000, Conference Paper, Proceedings of the 3rd Conference on Tectonic Problems of the San Andreas Fault System, Stanford University Publication Geological Sciences
No abstract available....
The San Andreas Fault in the San Francisco Bay region, California: structure and kinematics of a young plate boundary
R.C. Jachens, M.L. Zoback
W. G. Ernst, Robert G. Coleman, editor(s)
2000, Book chapter, Tectonic studies of Asia and the Pacific rim: a tribute to Benjamin M. Page (1911-1997)
Stable isotope evolution and paleolimnology of ancient Lake Creede
Robert O. Rye, Philip M. Bethke, David B. Finkelstein
2000, GSA Special Papers (346) 233-265
The lacustrine carbonate and travertine (tufa) deposits of ancient Lake Creede preserve a remarkable record of the isotopic evolution of the lake. That record indicates that the δ18O of the lake water, and by analogy its salinity, evolved through evaporation. Limited and less reliable data on hydrous minerals and fluid...
Stations in the USGS's National Stream Quality Accounting Network (NASQAN)
Keri Hitt
2000, Report
This is a point coverage of stations in the U.S. Geological Survey's National Stream Quality Accounting Network (NASQAN). NASQAN was established in 1973. Water-quality data currently is collected at NASQAN sites on bimonthly and quarterly intervals. However, some of the bimonthly stations will be sampled only five times a...
Controls on soil respiration: implications for climate change
Lindsey E. Rustad, Thomas G. Huntington, Richard D. Boone
2000, Biogeochemistry (48) 1-6
No abstract available....
Evaluation of mitigation activities related to OCS pipelines, pipelines canals, and navigation channels
Donald R. Cahoon, John A. Bourgeois
2000, Book, Proceedings: Eighteenth Annual Gulf of Mexico Information Transfer Meeting
No abstract available....
Development and implementation of the northeastern Gulf of Mexico characterization and data information management system and data transfer computer demonstration
William R. Jones, Helena Schaefer
2000, Minerals Management Service MMS 2000-030
No abstract available....
How useful is landslide hazard information? Lessons learned in the San Francisco Bay region
David G. Howell, Earl E. Brabb, David W. Ramsey
W. G. Ernst, Robert G. Coleman, editor(s)
2000, Book chapter, Tectonic studies of Asia and the Pacific rim: a tribute to Benjamin M. Page (1911-1997)
Landslides, worldwide and in the United States, are arguably the most costly natural hazard. Substantial landslide information is available, but much of it remains underutilized, as a disconnect exists among geologists, decision makers, and the public. The lack of a national landslide insurance policy exacerbates this situation and promotes litigation...
Ground water data from Fort Richardson, Alaska, for the period April 1997 to March 2000
B.N. Astley, C.F. Snyder, C.R. Lawson, T. Hall, A. Stables, J. Denner
2000, Letter Report LR-00-15
No abstract available....
Trace metal-rich Quaternary hydrothermal manganese oxide and barite deposit, Milos Island, Greece
J.R. Hein, G. Stamatakis, J.S. Dowling
2000, Applied Earth Sciences (109) 67-76
The Cape Vani Mn oxide and barite deposit on Milos Island offers an excellent opportunity to study the three-dimensional characteristics of a shallow-water hydrothermal system. Milos Island is part of the active Aegean volcanic arc. A 1 km long basin located between two dacitic domes in northwest Milos is filled...
A strategy for a stream-gaging network in Maryland
Emery T. Cleaves, Edward J. Doheny
2000, Maryland Geological Survey Report of Investigations 71
Water is a keystone resource. In abundance, it supplies cities, industries, and agriculture. To maintain healthy natural and human ecosystems, water must not only be present in adequate quantity, but it must be of suitable quality for its intended use. Water quality depends on the amount, or load, of contaminants, both natural and anthropogenic, that it contains....
Streamflow changes in the Sierra Nevada, California, simulated using a statistically downscaled general circulation model scenario of climate change
Robert L. Wilby, Michael D. Dettinger
2000, Book chapter, Linking climate change to land surface change
Simulations of future climate using general circulation models (GCMs) suggest that rising concentrations of greenhouse gases may have significant consequences for the global climate. Of less certainty is the extent to which regional scale (i.e., sub-GCM grid) environmental processes will be affected. In this chapter, a range of downscaling techniques...
