Reinterpretation of lower Mesozoic rocks on the Chilkat Peninsula, Alaska, as a displaced fragment of Wrangellia
George Plafker, C.D. Blome, Norman J. Silberling
1989, Geology (17) 3-6
The southern Chilkat Peninsula is underlain by low-grade metamorphic rocks consisting of a thick unit of greenstone, in part of Carnian age, that is locally overlain by an attenuated section of calcareous sedimentary rocks and chart of latest Carnian to late Norian age...
Structural analysis of the southern Peninsular, southern Wrangellia, and northern Chugach terranes along the Trans-Alaska Crustal Transect, northern Chugach Mountains, Alaska
W. J. Nokleberg, George Plafker, J. S. Lull, W. K. Wallace, G. R. Winkler
1989, Journal of Geophysical Research Solid Earth (94) 4297-4320
Structural and tectonic analysis of the southern Peninsular, southern Wrangellia, and northern Chugach terranes, along the Trans-Alaska Crustal Transect in the northern Chugach Mountains documents a long succession of Early Jurassic through Cenozoic deformational events. The deformational events are generally characterized by distinctive structural fabrics and metamorphisms. Most of the...
An algorithm for locating candidate labeling boxes within a polygon
Jan W. van Roessel
1989, American Cartographer (16) 201-209
Vector-based geographic information systems usually require annotation, such as a polygon number or attribute data, in a suitable location within a polygon. Traditional methods usually compute the polygon centroid, test the centroid for inclusion or exclusion, and select some alternative point when the centroid falls outside the polygon. Two problems...
Terrain, vegetation, and landscape evolution of the R4D research site, Brooks Range Foothills, Alaska
D.A. Walker, Emily F. Binnian, B. M. Evans, N.D. Lederer, E.A. Nordstrand, P.J. Webber
1989, Holarctic Ecology (12) 238-261
Maps of the vegetation and terrain of a 22 km2 area centered on the Department of Energy (DOE) R4D (Response, Resistance, Resilience to and Recovery from Disturbance in Arctic Ecosystems) study site in the Southern Foothills Physiographic Province of Alaska were made using integrated geobotanical mapping procedures and a geographic-information...
Inner shelf deposits of the Louisiana-Mississippi-Alabama region, Gulf of Mexico
Jack L. Kindinger, Shea Penland, S. Jeffress Williams, John R. Suter
1989, Gulf Coast Association of Geological Societies Transactions (39) 413-420
The late Quaternary morphology, shallow stratigraphy and sediment distribution of the Louisiana-Mississippi-Alabama inner shelf region are the product of transgressive and regressive sedimentary processes. Shelf sedimentary facies were deposited by deltaic progradation, followed by shoreface erosion and submergence. This information is based on interpretations and synthesis of more than 4,160...
Holocene sand shoals offshore of the Mississippi River delta plain
Shea Penland, John R. Suter, Randolph A. McBride, S. Jeffress Williams, Jack L. Kindinger, Ron Boyd
1989, Gulf Coast Association of Geological Societies Transactions (39) 471-480
Offshore of the Mississippi River delta plain lies a series of Holocene sand shoals marking the position of ancient submerged shorelines associated with younger shelf-phase delta plains. These submerged shorelines represent positions when sea level stood lower than present. Short periods of rapid sea level rise during the Holocene transgression,...
Gravity anomalies of irregularly shaped two-dimensional bodies with constant horizontal density gradient
Jeng-Jong Pan
1989, Geophysics (54) 528-530
An equation to compute the gravity anomalies of two-dimensional (2-D) bodies with density contrast varying with depth (z axis) was developed by Murthy and Rao (1979). I develop an equation for computing the gravity anomalies of 2-D bodies with constant horizontal density gradient. By combining this equation with the equation...
Image processing techniques for digital orthophotoquad production
Joy J. Hood, L. J. Ladner, Richard A. Champion
1989, Photogrammetric Engineering and Remote Sensing (55) 1323-1329
Orthophotographs have long been recognized for their value as supplements or alternatives to standard maps. Recent trends towards digital cartography have resulted in efforts by the US Geological Survey to develop a digital orthophotoquad production system. Digital image files were created by scanning color infrared photographs on a microdensitometer. Rectification...
Small-scale digital soil maps for interpreting natural resources
Norman B. Bliss, William U. Reybold
1989, Journal of Soil and Water Conservation (44) 30-34
Impacts of exploratory drilling for oil and gas on the benthic environment of Georges Bank
J. M. Neff, Michael H. Bothner, N. J. Maciolek, J. F. Grassle
1989, Marine Environmental Research (27) 77-114
A 3-year monitoring program was performed to assess the impacts of exploratory drilling for oil and gas on the benthic environment of Georges Bank, an important commercial fishery region in the North Atlantic east of Massachusetts, USA. Surficial sediments were sampled for chemical and benthic infaunal analysis and bottom still...
Investigations of SPOT cartographic applications in the U.S. Geological Survey
June M. Thormodsgard, Glen G. Kelly, Jeffrey D. Spooner
1989, CISM Journal ACSGC (43) 145-149
The US Geological Survey has a longstanding commitment to the advancement of the technology and applications of remotely sensed data from civilian satellite systems. In the past, research based on satellite data was primarily directed toward natural resource and land use applications rather than cartographic applications. The availability of high-resolution,...
Vegetation of wetlands of the prairie pothole region
H.A. Kantrud, J.B. Millar, A.G. Van Der Valk
A. van der Valk, editor(s)
1989, Book chapter, Northern prairie wetlands
Five themes dominate the literature dealing with the vegetation of palustrine and lacustrine wetlands of the prairie pothole region: environmental conditions (water or moisture regime, salinity), agricultural disturbances (draining, grazing, burning, sedimentation, etc.), vegetation dynamics, zonation patterns, and classification of the wetlands.The flora of a prairie wetland is a function...
Studies of geology and hydrology in the Basin and Range Province, southwestern United States, for isolation of high-level radioactive waste: Characterization of the Death Valley region, Nevada and California
Marion S. Bedinger, K. A. Sargent, W. H. Langer
1989, Professional Paper 1370-F
No abstract available....
Studies of geology and hydrology in the Basin and Range Province, southwestern United States, for isolation of high-level radioactive waste: Characterization of the Trans-Pecos region, Texas
M. S. Bedinger, K. A. Sargent, W. H. Langer
1989, Professional Paper 1370-B
No abstract available....
Analytical results for ten water-extractable ions from B-horizon soils on St. Thomas and St. Croix, U.S. Virgin Islands and K-Ar ages for seven rocks from St. John and St. Thomas, U.S. Virgin Islands
J. B. McHugh, R. E. Tucker, H. V. Alminas
1989, Open-File Report 89-563
No abstract available....
Preliminary map of upper Eocene to Holocene volcanic and related rocks of the Cascade Range, Oregon
David R. Sherrod, James G. Smith
1989, Open-File Report 89-14
Since 1979 the Geothermal Research Program of the U.S. Geological Survey has carried out multidisciplinary research in the Cascade Range. The goal of this research is to understand the geology, tectonics, and hydrology of the Cascades in order to characterize and quantify geothermal resource potential. A major goal of the...
Hydrologic data of the Nashua and Souhegan River basins, Massachusetts
B. P. Hansen, R. A. Brackley, V. A. de Lima
1989, Open-File Report 87-221
No abstract available....
Selected ground-water data, Chester County, Pennsylvania
Ronald A. Sloto
1989, Open-File Report 87-217
Hydrologic data for Chester County, Pennsylvania are given for 3,010 wells and 32 springs. Water levels are given for 48 observation wells measured monthly during 1936-86. Chemical analyses of ground water are given for major ions, physical properties, nutrients, metals and other trace constituents, volatile organic compounds, acid organic compounds,...
Nitrogen dynamics in the tidal freshwater Potomac River, Maryland and Virginia, water years 1979-81
David J. Shultz
1989, Water Supply Paper 2234-J
On an annual basis, river-supplied nitrate is the predominant form of nitrogen supplied to the tidal Potomac River from external sources. Much of the nitrate is associated with high flows that have rapid transit times through the tidal river. The Blue Plains Sewage-Treatment Plant (STP) at Washington, D.C., is the...
Recent carbonate slope sediments and sedimentary processes bordering a non-rimmed platform: southwest Florida continental margin
Gregg R. Brooks, Charles W. Holmes
1989, Book chapter, Controls on carbonate platforms and basin development
No abstract available....
Management of fish populations in large rivers: a review of tools and approaches
Geoffrey E. Petts, Jack G. Imhoff, Bruce A. Manny, John F. B. Maher, Stephen B. Weisberg
1989, Conference Paper, Proceedings of the International Large River Symposium
In common with most branches of science, the management of riverine fish populations is characterised by reductionist and isolationist philosophies. Traditional fish management focuses on stocking and controls on fishing. This paper presents a consensus of scientists involved in the LARS workshop on the management of fish populations in large rivers....
Compilation of hydrologic data for the Edwards aquifer, San Antonio area, Texas, 1988, with 1934-88 summary
G.M. Nalley
1989, Edwards Underground Water District Bulletin 48
No abstract available....
Climate variability in an estuary: Effects of riverflow on San Francisco Bay
David H. Peterson, Daniel R. Cayan, John F. Festa, Frederic H. Nichols, Roy A. Walters, James V. Slack, Stephen E. Hager, Laurence E. Schemel
David H. Peterson, editor(s)
1989, Book chapter, Aspects of climate variability in the Pacific and the Western Americas
A simple conceptual model of estuarine variability in the context of climate forcing has been formulated using up to 65 years of estimated mean-monthly delta flow, the cumulative freshwater flow to San Francisco Bay from the Sacramento-San Joaquin River, and salinity observations near the mouth, head, mid-estuary, and coastal...
On inter-tidal transport equation
Ralph T. Cheng, Shizuo Feng, Xi Pangen
1989, Book chapter, Estuarine circulation
The transports of solutes, sediments, nutrients, and other tracers are fundamental to the interactive physical, chemical, and biological processes in estuaries. The characteristic time scales for most estuarine biological and chemical processes are on the order of several tidal cycles or longer. To address the long-term transport mechanism meaningfully, the...
Origin of the name for the San Andreas Fault
E. H. Pampeyan
1989, Earthquakes & Volcanoes (USGS) (21) 123-124
