Geochemistry of surface sediments of Minnesota lakes
Walter E. Dean, Eville Gorham, Dalway J. Swaine
1993, GSA Special Papers (276) 115-133
Analyses of 36 trace, minor, and major elements were used to classify the sediments of 46 Minnesota lakes. Q-mode factor analyses grouped Minnesota lake sediments according to clastic-, carbonate-, organic-, and redox-related elements. Carbonate lakes occur in west-central Minnesota; their sediments have relatively high concentrations of CaCO3, Ba, and Sr....
Holocene climatic and limnologic history of the north-central United States as recorded in the varved sediments of Elk Lake, Minnesota: A synthesis
J. Platt Bradbury, Walter E. Dean, R.Y. Anderson
1993, GSA Special Papers (276) 309-328
Integration of the results and interpretations of geochemical, paleoecological, and sedimentological analyses of a varved sediment record provides a detailed chronicle of limnological and climatic changes for the past 10 ka at Elk Lake, west-central Minnesota. The early Holocene record at Elk Lake was controlled by circumstances of glacial history...
Environment of deposition of CaCO3 in Elk Lake, Minnesota
Walter E. Dean, R.O. Megard
1993, GSA Special Papers (276) 97-113
Elk Lake is near the present forest-prairie border in northwestern Minnesota, and is also located on the boundary between hard-water lakes that are typical of once-glaciated parts of the north-central United States and more saline prairie lakes of western Minnesota and the Dakotas. The sediments of the prairie lakes just...
40Ar/39Ar thermochronology and Alleghanian development of the southernmost Appalachian Piedmont, Alabama and southwest Georgia
Mark G. Steltenpohl, Michael J. Kunk
1993, GSA Bulletin (105) 819-833
40Ar/39Ar age spectra of hornblende, muscovite, and microcline, and total fusion ages of biotite from metamorphic rocks of the Inner Piedmont, Pine Mountain, and Uchee belts are reported. Mineral cooling ages from the eastern part of the Inner Piedmont are as follows: hornblende, 320 Ma; muscovite, 296 Ma; biotite, 293...
Extension and contraction within an evolving divergent strike-slip fault complex: The San Andreas and San Jacinto fault zones at their convergence in southern California
Douglas M. Morton, Jonathan C. Matti
Robert E. Powell, R.J. Weldon II, editor(s)
1993, Book chapter, The San Andreas Fault system: Displacement, palinspastic reconstruction, and geologic evolution
A variety of extensional and contractional structures is produced by strike slip faulting. The variety and extent of the structures are directly related to the kind and extent of geometric complexities of the fault zone or system. The area of convergence of the San Andreas fault zone and the much...
Landfill mapping using multi-disciplinary geophysical techniques at the U.S. Air Force Academy, Colorado Springs, CO
Robert Horton, John W. Busby, Michael H. Powers, Ronald N. Knoshaug
1993, Book, Proceedings of the symposium on the application of geophysics to engineering and environmental problems: SAGEEP '93
This paper describes a multi-disciplinary geophysical survey conducted over a landfill on the U.S. Air Force Academy grounds near Colorado Springs, Colorado. The landfill is known to contain waste generated during the construction of the Academy and reportedly contains buried steel drums. The purpose of the geophysical surveys was to determine the subsurface distribution...
Temporal and spatial variation in habitat characteristics of Tilefish (Lopholatilus Chamaeleonticeps) off the east coast of Florida
Kenneth W. Able, Churchill B. Grimes, Robert Jones, David C. Twichell
1993, Bulletin of Marine Science (53) 1013-1026
The tilefish, Lopholatilus chamaeleonticeps, constructs burrows in carbonate sediments off the central east coast of Florida at similar temperatures (8.6-15.4°C) and in similar sediment textures (high proportion of silts and clays) to conspecifics in the Mid-Atlantic Bight. The depths at which we observed tile fish off Florida (150-290 m), based...
The Pajarito Plateau: A bibliography
Frances Joan Mathien, Charlie R. Steen, Craig D. Allen
1993, NPS Southwest Cultural Resources Center Professional Paper 49
This bibliography is the result of two initially independent projects. As the consulting archaeologist at Los Alamos National Laboratory (LANL), Charlie R. Steen collected entries at the suggestion of the staff of the Environmental Surveillance Group of the Health, Safety, and Environmental Division, HSE-8. The primary purpose was to aid...
A speculative history of the San Andreas fault in the central Transverse Ranges, California
R.J. Weldon II, K. E. Meisling, J. Alexander
Robert E. Powell, Jonathan C. Matti, editor(s)
1993, Book chapter, The San Andreas Fault system: Displacement, palinspastic reconstruction, and geologic evolution
It is generally accepted that the San Andreas fault formed between 4 and 5 Ma and that rocks west of it are now part of the Pacific plate, moving northwest relative to North America at 5 to 6 cm/yr. This model is inconsistent with the geologic record in the central...
Chapter 6: Chronology of displacement on the San Andreas fault in central California: Evidence from reversed positions of exotic rock bodies near Parkfield, California
John D. Sims
Robert E. Powell, R.J. Weldon II, Jonathan C. Matti, editor(s)
1993, Book chapter, The San Andreas Fault system: Displacement, palinspastic reconstruction, and geologic evolution
This chapter presents a synthesis of data pertaining to post-early Miocene slip on the San Andreas fault in central California and suggests a three-phase evolition of the San Andreas system. The cricial evidence that supports the three phases of evolution conies from the reversed positions of two exotic rock fragments...
Landslides caused by the Klamath Falls, Oregon, earthquakes of September 20, 1993
D. K. Keefer, R. L. Schuster
1993, Earthquakes & Volcanoes (USGS) (24) 140-146
The Klamath Falls earthquakes caused landslides throughout an area of about 420 sq km and as far as about 29 km from the epicenter, a distribution that is typical for magnitude 6 earthquakes (see graphs on following pages). Most of the landslides were rock falls or shallow, highly disrupted rock...
Seasonal use of conservation reserve program lands by white-tailed deer in east-central South Dakota
Jeffrey H. Gould, Kurt J. Jenkins
1993, Wildlife Society Bulletin (21) 250-255
The Conservation Reserve Program (CRP_, a provision of the 1985 Food Security Act, subsidizes landowners to take highly erodible lands out of cultivation and seed them to perennial cover for 10years. In eastern South Dakota, 0.5 million ha were enrolled in the CRP from 1985 to 1990 (Agric. Stabilization and...
Regional and economic geology of Pennsylvanian age coal beds of West Virginia
T.E. Repine Jr., B.M. Blake, K. C. Ashton, N. Fedorko III, A.F. Keiser, E.I. Loud, C.J. Smith, S. McClelland, G.H. McColloch
1993, International Journal of Coal Geology (23) 75-101
West Virginia is the only place in the United States where an entire section of Pennsylvanian age (Upper Carboniferous) strata can be seen. These strata occur within a wedge of rock that thins to the north and west from the southeastern...
Ground-water withdrawals, water levels, and ground-water quality in the Houston district, Texas, with emphasis on 1985-89
D.L. Barbie, G.L. Locke
1993, Water-Resources Investigations Report 92-4180
This report is one in a series of reports prepared by the U.S. Geological Survey, beginning in 1937, on the ground-water resources in the Houston district. The Houston district includes Harris and Galveston Counties, and parts of Brazoria, Fort Bend, Waller, Montgomery, Liberty, and Chambers Counties. The primary emphasis of...
Natural gas hydrates of the Prudhoe Bay and Kuparuk River area, North Slope, Alaska
Timothy S. Collett
1993, American Association of Petroleum Geologists Bulletin (77) 793-812
Gas hydrates are crystalline substances composed of water and gas, mainly methane, in which a solid-water lattice accommodates gas molecules in a cage-like structure, or clathrate. These substances commonly have been regarded as a potential unconventional source of natural gas because of their enormous gas-storage capacity. Significant quantities of naturally...
First collection of rudd, Scardinius erythrophthalmus (Cyprinidae), in the New River, West Virginia
R.S. Easton, D.J. Orth, N.M. Burkhead
1993, Journal of Freshwater Ecology (8) 263-264
We collected the first rudd, Scardinius erythrophthalmus (Cyprinidae), from the New (Kanawha) River drainage, West Virginia. The rudd has now been reported from 12 states (Arkansas, Kansas, Illinois, Massachusetts, Maine, Missouri, New York, Oklahoma, Virginia, Wisconsin, and West Virginia) and several major river systems. The rapid spread of the rudd has apparently...
Petrology and U-Pb geochronology of buried Avalonian plutonic rocks on southeastern Cape Cod
G. W. Leo, J.K. Mortensen, B. Barreiro, J. D. Phillips
1993, Atlantic Geology (29) 103-113
Plutonic rocks have been intersected by two separate drill holes on southeastern Cape Cod. Hole CC2 is located at Chatham Harbor about 7 km south of the Nauset anomaly, an east-northeast-trending magnetic lineament that was considered to separate the distinct plutonic zones of Avalon terrane. This drill hole intersected weakly...
Oxygen buffering of Kilauea volcanic gases and the oxygen fugacity of Kilauea basalt
T.M. Gerlach
1993, Geochimica et Cosmochimica Acta (57) 795-814
Volcanic gases collected during episode 1 of the Puu Oo eruption along the east rift zone of Kilauea Volcano, Hawaii, have uniform C-O-H-S-Cl-F compositions that are sharply depleted in CO2. The CO2-poor gases are typical of Type II volcanic gases (gerlach and Graeber, 1985) and were emitted from evolved magma...
Response of a 42-storey steel-frame building to the Ms = 7.1 Loma Prieta earthquake
E. Safak
1993, Engineering Structures (15) 403-421
A set of 14 acceleration records was obtained from a 42-storey steel-frame building, the Chevron Building, in San Francisco during the Ms= 7.1">Ms= 7.1 Loma Prieta earthquake of 17 October 1989. Data were analysed using a system identification method based on the discretetime linear filtering, and...
Geology and genesis of the Baid Al Jimalah tungsten deposit, Kingdom of Saudi Arabia
R.J. Kamilli, J. C. Cole, J. E. Elliott, R.E. Criss
1993, Economic Geology (88) 1743-1767
The Baid al Jimalah tungsten deposit in Saudi Arabia (lat 25 degrees 09'N, long 42 degrees 41'E) consists predominantly of swarms of steeply dipping, subparallel, tungsten-bearing quartz veins and of less abundant, smaller stockwork veins. It is spatially, temporally, and genetically associated with a 569 Ma, highly differentiated, porphyritic, two-feldspar...
Radionuclides in ground water of the Carson River Basin, western Nevada and eastern California, U.S.A.
J. M. Thomas, A. H. Welch, M.S. Lico, J. L. Hughes, R. Whitney
1993, Applied Geochemistry (8) 447-471
Ground water is the main source of domestic and public supply in the Carson River Basin. Ground water originates as precipitation primarily in the Sierra Nevada in the western part of Carson and Eagle Valleys, and flows down gradient in the direction of the Carson River through Dayton and Churchill...
A detailed taxonomy of Upper Cretaceous and lower Tertiary Crassatellidae in the eastern United States: An example of the nature of extinction at the boundary
G. Lynn Wingard
1993, Professional Paper 1535
Current theories on the causes of extinction at the Cretaceous-Tertiary boundary have been based on previously published data; however, few workers have stopped to ask the question, 'How good is the basic data set?' To test the accuracy of the published record, a quantitative and qualitative analysis of the Crassatellidae...
Significant bed elevation changes related to Gulf Stream dynamics on the South Carolina continental shelf
G. Gelfenbaum, M. Noble
1993, Continental Shelf Research (13) 385-405
Photographs of the seabed taken from an instrumented bottom tripod located approximately 100 km east of Charleston, South Carolina, reveal bed elevation changes of over 20 cm between July and November 1978. The tripod was in 85 m of water and was equipped with two current meters at 38.7 and...
Constraints in the hot-dry-rock resources of the united states
John Sass, Marianne Guffanti
Anon, editor(s)
1993, Conference Paper, Transactions - Geothermal Resources Council
As with hydrothermal systems, the western U.S has higher HDR potential overall than the eastern U.S. because geothermal gradients on average are higher in the west. Nevertheless, some attractive exploration targets occur in the eastern U.S. The most favorable target in the eastern U.S. (defined here to include the Great...
Cytonuclear genetic architecture in mosquitofish populations and the possible roles of introgressive hybridization
Kim T. Scribner, John C. Avise
1993, Molecular Ecology (2) 139-149
Spatial genetic structure in populations of mosquitofish (Gambusia) sampled throughout the south-eastern United States was characterized using mitochondrial (mt) DNA and allozyme markers. Both sets of data revealed a pronounced genetic discontinuity (along a broad path extending from south-eastern Mississippi to north-eastern Georgia) that corresponds to a recently recognized distinction...
