Application of geologic map information to water quality issues in the southern part of the Chesapeake Bay watershed, Maryland and Virginia, eastern United States
L. McCartan, J. D. Peper, L. J. Bachman, J. Wright Horton Jr.
1999, Journal of Geochemical Exploration (64) 355-376
Geologic map units contain much information about the mineralogy, chemistry, and physical attributes of the rocks mapped. This paper presents information from regional-scale geologic maps in Maryland and Virginia, which are in the southern part of the Chesapeake Bay watershed in the eastern United States. The geologic map information is...
Chronology of polyphase extension in the Windermere Hills, northeast Nevada
K.J. Mueller, P.K. Cerveny, M. E. Perkins, L.W. Snee
1999, Geological Society of America Bulletin (111) 11-27
Fission-track and 40Ar/39Ar dating and chemical correlation of volcanic strata exposed in the Windermere Hills and northern Pequop Mountains, northeast Nevada, indicate a protracted, polyphase history of Tertiary (late Eocene–late Miocene) extension along the northern margin of a major Cordilleran metamorphic core complex. Early...
Historical trends of metals in the sediments of San Francisco Bay, California
Michelle I. Hornberger, S. N. Luoma, A. VanGeen, C. Fuller, R. Anima
1999, Marine Chemistry (64) 39-55
Concentrations of Ag, Al, Cr, Cu, Fe, Hg, Mn, Ni, Pb, V and Zn were determined in six sediment cores from San Francisco Bay (SFB) and one sediment core in Tomales Bay (TB), a reference estuary. SFB cores were collected from between the...
Deaggregation of probabilistic ground motions in the central and eastern United States
S. Harmsen, D. Perkins, A. Frankel
1999, Bulletin of the Seismological Society of America (89) 1-13
Probabilistic seismic hazard analysis (PSHA) is a technique for estimating the annual rate of exceedance of a specified ground motion at a site due to known and suspected earthquake sources. The relative contributions of the various sources to the total seismic hazard are determined as a function of their occurrence rates...
Three-dimensional velocity structure of Siletzia and other accreted terranes in the Cascadia forearc of Washington
T. Parsons, R.E. Wells, M. A. Fisher, E. Flueh, Uri S. ten Brink
1999, Journal of Geophysical Research B: Solid Earth (104) 18015-18039
Eocene mafic crust with high seismic velocities underlies much of the Oregon and Washington forearc and acts as a backstop for accretion of marine sedimentary rocks from the obliquely subducting Juan de Fuca slab. Arc-parallel migration of relatively strong blocks of this terrane, known as Siletzia, focuses upper crustal deformation...
U-Pb zircon age of metafelsite from the Pinney Hollow formation: Implications for the development of the Vermont Appalachians
Gregory J. Walsh, John Aleinikoff
1999, American Journal of Science (299) 157-170
The Pinney Hollow Formation of central Vermont is part of a rift-clastic to drift-stage sequence of cover rocks deposited on the Laurentian margin during the development of the Iapetan passive margin in Late Proterozoic to Cambrian time. Conventional U-Pb zircon data indicate an age of 571+ or -5 Ma for...
The evolutionary history of steelhead (Oncorhynchus mykiss) along the US Pacific Coast: Developing a conservation strategy using genetic diversity
J.L. Nielsen
1999, ICES Journal of Marine Science (56) 449-458
Changes in genetic variation across a species range may indicate patterns of population structure resulting from past ecological and demographic events that are otherwise difficult to infer and thus provide insight into evolutionary development. Genetic data is used, drawn from 11 microsatellite loci amplified from anadromous steelhead (Oncorhynchus mykiss) sampled...
The search for a source rock for the giant Tar Sand triangle accumulation, southeastern Utah
J. E. Huntoon, P. L. Hansley, N. D. Naeser
1999, American Association of Petroleum Geologists Bulletin (83) 467-495
A large proportion (about 36%) of the worlds oil resource is contained in accumulations of heavy oil or tar. In these large deposits of degraded oil, the oil in place represents only a fraction of what was present at the time of accumulation. In many of these deposits, the source...
Tectonic and regional metamorphic implications of the discovery of Middle Ordovician conodonts in cover rocks east of the Green Mountain massif, Vermont
N. M. Ratcliffe, A. G. Harris, G. J. Walsh
1999, Canadian Journal of Earth Sciences (36) 371-382
Middle Ordovician (late Arenigian - early Caradocian) conodonts were recovered from a dolostone lens in carbonaceous schist 30 m below the base of the Pinney Hollow Formation in the Eastern Cover sequence near West Bridgewater, Vermont. These are the first reported fossils from the metamorphic cover sequence rocks east of...
Present-day deformation across the Basin and Range Province, western United States
W. Thatcher, G.R. Foulger, B.R. Julian, J. Svarc, E. Quilty, G.W. Bawden
1999, Science (283) 1714-1718
The distribution of deformation within the Basin and Range province was determined from 1992, 1996, and 1998 surveys of a dense, 800-kilometer- aperture, Global Positioning System network, Internal deformation generally follows the pattern of Holocene fault distribution and is concentrated near the western extremity of the province, with lesser amounts...
Structural and petrologic evolution of the Lihue basin and eastern Kauai, Hawaii
P.W. Reiners, B.K. Nelson, S. K. Izuka
1999, Geological Society of America Bulletin (111) 674-685
The topography of the eastern part of the Hawaiian island of Kauai is dominated by the Lihue basin, a large (∼110 km2) semicircular depression bounded by steep cliffs and partly filled by late rejuvenated-stage (or posterosional stage) volcanic material. As with other large,...
Regional Vp, Vs, Vp/Vs, and Poisson's ratios across earthquake source zones from Memphis, Tennessee, to St. Louis, Missouri
R. D. Catchings
1999, Bulletin of the Seismological Society of America (89) 1591-1605
Models of P- and S-wave velocity, Vp/Vs ratios, Poisson's ratios, and density for the crust and upper mantle are presented along a 400-km-long profile trending from Memphis, Tennessee, to St. Louis, Missouri. The profile crosses the New Madrid seismic zone and reveals distinct regional variations in the crustal velocity structure...
Quaternary grabens in southernmost Illinois: Deformation near an active intraplate seismic zone
W.J. Nelson, F.B. Denny, L.R. Follmer, J.M. Masters
1999, Tectonophysics (305) 381-397
Narrow grabens displace Quaternary sediments near the northern edge of the Mississippi Embayment in extreme southern Illinois, east-central United States. Grabens are part of the Fluorspar Area Fault Complex (FAFC), which has been recurrently active throughout Phanerozoic time. The FAFC strikes directly toward the New Madrid Seismic Zone (NMSZ), scene...
Thermal regime of the Great Basin and its implications for enhanced geothermal systems and off-grid power
John H. Sass, Mark A. Walters
1999, Geothermal Resources Council Transactions (23) 211-218
The Basin and Range Province of the Western United States covers most of Nevada and parts of adjoining states. It was formed by east-west tectonic extension that occurred mostly between 50 and 10 Ma, but which still is active in some areas. The northern Basin and Range, also known as...
Prediction of episodic acidification in North-eastern USA: An empirical/mechanistic approach
T.D. Davies, M. Tranter, P.J. Wigington Jr., K.N. Eshleman, N.E. Peters, J. Van Sickle, David R. DeWalle, Peter S. Murdoch
1999, Hydrological Processes (13) 1181-1195
Observations from the US Environmental Protection Agency's Episodic Response Project (ERP) in the North-eastern United States are used to develop an empirical/mechanistic scheme for prediction of the minimum values of acid neutralizing capacity (ANC) during episodes. An acidification episode is defined as a hydrological event during which ANC decreases. The...
Variations in water clarity and bottom albedo in Florida Bay from 1985 to 1997
R. P. Stumpf, M.L. Frayer, M.J. Durako, J. C. Brock
1999, Estuaries (22) 431-444
Following extensive seagrass die-offs of the late 1980s and early 1990s, Florida Bay reportedly had significant declines in water clarity due to turbidity and algal blooms. Scant information exists on the extent of the decline, as this bay was not investigated for water quality concerns before the die-offs and limited...
Reproductive biology and juvenile recruitment of the shinyrayed pocketbook, Lampsilis subangulata (Bivalvia: Unionidae) in the Gulf Coastal Plain
C. A. O’Brien, Jayne Brim-Box
1999, American Midland Naturalist (142) 129-140
The reproductive biology, glochidial morphology and recruitment of the federally endangered shinyrayed pocketbook, Lampsilis subangulata, were studied from May 1995 to July 1996 in the Flint River system, Georgia. Gravid female L. subangulata were found nine months of the year. On 19 May 1995, a L. subangulata was discovered releasing a superconglutinate,...
Reconstructing the history of eastern and central Florida Bay using mollusk-shell isotope records
R. B. Halley, L.M. Roulier
1999, Estuaries (22) 358-368
Stable isotopic ratios of carbon and oxygen (δ13C and δ18O) from mollusk shells reflect the water quality characteristics of Florida Bay and can be used to characterize the great temporal variability of the bay. Values of δ18O are directly influenced by temperature and evaporation and may be related to salinity,...
Trace-element geochemistry of metabasaltic rocks from the Yukon-Tanana Upland and implications for the origin of tectonic assemblages in east-central Alaska
Cynthia Dusel-Bacon, K.M. Cooper
1999, Canadian Journal of Earth Sciences (36) 1671-1695
We present major- and trace- element geochemical data for 27 amphibolites and six greenstones from three structural packages in the Yukon-Tanana Upland of east-central Alaska: the Lake George assemblage (LG) of Devono-Mississippian augen gneiss, quartz-mica schist, quartzite, and amphibolite; the Taylor Mountain assemblage (TM) of mafic schist and gneiss, marble,...
Large-magnitude, late Holocene earthquakes on the Genoa fault, West-Central Nevada and Eastern California
A. R. Ramelli, J. W. Bell, C.M. DePolo, J. C. Yount
1999, Bulletin of the Seismological Society of America (89) 1458-1472
The Genoa fault, a principal normal fault of the transition zone between the Basin and Range Province and the northern Sierra Nevada, displays a large and conspicuous prehistoric scarp. Three trenches excavated across this scarp exposed two large-displacement, late Holocene events. Two of the trenches contained multiple layers of stratified...
Mercury concentration in coal — Unraveling the puzzle
B. Toole-O’Neil, S.J. Tewalt, R. B. Finkelman, D.J. Akers
1999, Fuel (78) 47-54
Based on data from the US Geological Survey's COALQUAL database, the mean concentration of mercury in coal is approximately 0.2 μg g−1. Assuming the database reflects in-ground US coal resources, values for conterminous US coal areas range from 0.08 μg g−1 for coal in the San Juan and Uinta regions to 0.22 μg g−1 for the Gulf Coast...
Water Resources Data, New York, Water Year; 1998. Volume 1. Eastern New York; Excluding Long Island
Gerard K. Butch, Patricia M. Murray, Richard Lumia, Jay F. Weigel
1999, Water Data Report NY-98-1
Water resources data for the 1998 water year for New York consist of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; and ground-water levels. This volume contains records for water discharge at 127 gaging stations; stage only at 10 gaging...
Simulation of ground-water system response to proposed withdrawals from 1993 to 2043 in the northern part of Juab Valley, Juab County, Utah
Susan A. Thiros
1999, Water-Resources Investigations Report 98-4262
Information on the ground-water system in the northern part of Juab Valley, Utah, is needed by water managers to plan the optimal use of surface water that will be imported by the Central Utah Project and ground water pumped locally. The response of the ground-water system to an increase in...
Evaluation of processes affecting 1,2-dibromo-3-chloropropane (DBCP) concentrations in ground water in the eastern San Joaquin Valley, California: Analysis of chemical data and ground-water flow and transport simulations
Karen R. Burow, Sandra Y. Panshin, Neil H. Dubrovsky, David Vanbrocklin, Graham E. Fogg
1999, Water-Resources Investigations Report 99-4059
Future use of the sole-source aquifer near Fresno in the eastern San Joaquin Valley, California, will depend, in part, on how long 1,2-dibromo-3-chloropropane (DBCP), an agricultural fumigant banned from use since the late 1970's, persists at concentrations greater than the maximum contaminant level of 0.2 micrograms per liter (mg/L). Field...
Selected nutrients and pesticides in streams of the eastern Iowa basins, 1970-95
Douglas J. Schnoebelen, Kent Becher, Matthew W. Bobier, Thomas Wilton
1999, Water-Resources Investigations Report 99-4028
Water-quality data from 17 surface-water monitoring sites were compiled for 1970 through 1995 and analyzed to determine historical waterquality conditions and possible trends in the Eastern Iowa Basins study unit as part of the U.S. Geological Survey's National Water-Quality Assessment Program. The Eastern Iowa Basins encompasses the Wapsipinicon, Cedar, Iowa,...
