Visual observations of historical lake trout spawning grounds in western Lake Huron
Robert T. Nester, Thomas P. Poe
1987, North American Journal of Fisheries Management (7) 418-424
Direct underwater video observations were made of the bottom substrates at 12 spawning grounds formerly used by lake trout Salvelinus namaycush in western Lake Huron to evaluate their present suitability for successful reproduction by lake trout. Nine locations examined north of Saginaw Bay in the northwestern end of the lake...
Gravel bar mussel communities: a community model
A.C. Miller, B.S. Payne, T.J. Naimo, W. D. Russell-Hunter
1987, Technical Report EL-87-13
Abstract not submitted to date...
U.S. Geological Survey: earth science in the public service
Water Resources Division, U.S. Geological Survey
1987, Report
No abstract available....
Residence times of channel-stored sediment in Redwood Creek, northwestern California
Mary Ann Madej
1987, Publication 165
No abstract available at this time...
Marking and tagging of aquatic animals: an indexed bibliography
L. Emery, R. Wydoski
1987, Resource Publication 165
No abstract available....
Random sample diet test: starter diets for coho salmon
H. G. Ketola, C. E. Smith, G. A. Kindschi
1987, Bozeman Information Leaflet 37
No abstract available at this time...
Chemical structural studies of natural lignin by dipolar dephasing solid-state 13C nuclear magnetic resonance
Patrick G. Hatcher
1987, Organic Geochemistry (11) 31-39
Two natural lignins, one from a gymnosperm wood the other from angiosperm wood, were examined by conventional solid-state and dipolar dephasing 13C nuclear magnetic resonance (NMR) techniques. The results obtained from both techniques show that the structure of natural lignins is consistent with models of softwood and hardwood lignin. The dipolar...
Topics in chemical instrumentation: X-ray fluorescence spectrometric analysis of geologic materials - Part 1. Principles and instrumentation
J.A. Anzelmo, J.R. Lindsay
1987, Journal of Chemical Education (64) A181-A190
[No abstract available]...
Landsat Image Map Production Methods at the U. S. Geological Survey
R.D. Kidwell, D.R. Binnie, S. Martin
1987, Journal of Imaging Technology (13) 93-96
To maintain consistently high quality in satellite image map production, the U. S. Geological Survey (USGS) has developed standard procedures for the photographic and digital production of Landsat image mosaics, and for lithographic printing of multispectral imagery. This paper gives a brief review of the photographic, digital, and lithographic procedures...
Sedimentation across the central California oxygen minimum zone: an alternative coastal upwelling sequence
T. L. Vercoutere, H.T. Mullins, K. McDougall, J.B. Thompson
1987, Journal of Sedimentary Petrology (57) 709-722
Distribution, abundance, and diversity of terrigenous, authigenous, and biogenous material provide evidence of the effect of bottom currents and oxygen minimum zone (OMZ) on continental slope sedimentation offshore central California. Box core samples and bottom photographs collected across the oxygen minimum zone of...
Sericite from the Silverton caldera, Colorado: correlation among structure, composition, origin, and particle thickness.
D. D. Eberl, J. Srodon, M. Lee, P.H. Nadeau, H. R. Northrop
1987, American Mineralogist (72) 914-934
The mineralogy and the origin of a suite of almost pure sericites, collected from fractures in hydrothermally altered volcanic rocks in the vicinity of the Silverton caldera in the western San Juan Mountains of Colorado, USA, are analysed.-J.A.Z....
Effect of urbanization on the water resources of eastern Chester County, Pennsylvania
R. A. Sloto
1987, Water-Resources Investigations Report 87-4098
The effects of human activity on the water resources of a 207-square-mile area of eastern Chester County was evaluated. The most serious consequence of urbanization is the contamination of ground water by volatile organic compounds, which were detected in 39 percent of the 70 wells sampled. As many as nine...
Current loops fitted to geomagnetic model spherical harmonic coefficients.
L.R. Alldredge
1987, Journal of Geomagnetism & Geoelectricity (39) 271-296
One hundred-sixty circular current loops with radial axes were fitted by least squares to the 899 spherical harmonic coefficients of a 29th degree model. In the first case, the parameters that were fitted for each loop were the normalized magnetic moment, the distance from the center of the Earth...
Molecular weight of aquatic fulvic acids by vapor pressure osmometry
G. R. Aiken, Ronald L. Malcolm
1987, Geochimica et Cosmochimica Acta (51) 2177-2184
The molecular weights of aquatic fulvic acids extracted from five rivers were determined by vapor pressure osmometry with water and tetrahydrofuran as solvents. The values obtained ranged from 500 to 950 dallons, indicating that the molecular weights of aquatic fulvic acids are not as great as has been suggested in...
Compositional evidence regarding the origins of rims on Semarkona chondrules
J. N. Grossman, J. T. Wasson
1987, Geochimica et Cosmochimica Acta (51) 3003-3011
The compositions of the interiors and abraded surfaces of 7 chondrules from Semarkona (LL3.0) were measured by neutron activation analysis. For nonvolatile elements, the lithophile and siderophile element abundance patterns in the surfaces are generally similar to those in the corresponding interiors. Siderophile and chalcophile concentrations are much higher in...
On regional geomagnetic charts
L.R. Alldredge
1987, Journal of Geomagnetism & Geoelectricity (39) 723-738
When regional geomagnetic charts for areas roughly the size of the United States were compiled by hand, some large local anomalies were displayed in the isomagnetic lines. Since the late nineteen sixties, when the compilation of charts using computers and mathematical models was started, most of the details...
Three volcanoes erupt in Alaska
T. P. Miller
1987, Earthquakes & Volcanoes (USGS) (19) 192-198
Alaska has over 40 historically active volcanoes and normally averages one eruption a year. Alaskan volcanoes were unusually active in 1986. Augustine, Pavlof, and Akutan volcaneos all erupted vigorously; at one time in April, all three were erupting. ...
Incidental catch of marine birds and mammals in fishing nets off Newfoundland, Canada
John F. Piatt, David N. Nettleship
1987, Marine Pollution Bulletin (18) 344-349
Summer surveys of the incidental catch of marine birds and mammals in fishing nets around the east coast of Newfoundland indicated that over 100 000 animals were killed in nets during a 4-year period (1981–1984). Composition of catches depended on foraging behaviour, regional abundance, and the degree of foraging aggregation...
Alaska interim land cover mapping program
Water Resources Division, U.S. Geological Survey
1987, Data Users Guide 7
In order to meet the requirements of the Alaska National Interest Lands Conservation Act (ANILCA) for comprehensive resource and management plans from all major land management agencies in Alaska, the USGS has begun a program to classify land cover for the entire State using Landsat digital data. Vegetation and land...
Glossary of selected volcanic terms
C.D. Miller
1987, Earthquakes & Volcanoes (USGS) (19) 155-155
Geologic map of the Handies Peak quadrangle, San Juan, Hinsdale and Ouray Counties, Colorado
Robert G. Luedke, Wilbur S. Burbank
1987, Geologic Quadrangle 1595
No abstract available....
Preliminary geologic map of the Butte 1 degree by 2 degrees quadrangle, western Montana
C. A. Wallace, R. G. Schmidt, D. J. Lidke, M. R. Waters, J. E. Elliott, A. B. French, J. W. Whipple, S. E. Zarske, M. J. Blaskowski, B. A. Heise, R. A. Yeoman, J.M. O’Neill, D. A. Lopez, G. D. Robinson, M. R. Klepper
1987, Open-File Report 86-292
No abstract available....
Picture windows of opportunity
S. Matt
1987, Earthquakes & Volcanoes (USGS) (19) 174-177
We hate to say that we need a moderate earthquake every once in a while, but experience shows that it surely helps to sell all kinds of seismic safety programs It took the 933 Long Beach earthquake to get the Field Act passed in California requiring the strengthening of our public schools. It...
Use of slope, aspect, and elevation maps derived from digital elevation model data in making soil surveys
A. A. Klingebiel, E. H. Horvath, D. G. Moore, W.U. Reybold
1987, Book chapter, Soil survey techniques, SSSA Special Publication 20
Maps showing different classes of slope, aspect, and elevation were developed from U.S. Geological Survey digital elevation model data. The classes were displayed on clear Mylar at 1:24 000-scale and registered with topographic maps and orthophotos. The maps were used with aerial photographs, topographic maps, and other resource data to...
Devastating tsunami inspires efforts to reduce future tsunami destruction
P. A. Lockridge
1987, Earthquakes & Volcanoes (USGS) (19) 60-64
The beacon from landmark Scotch Cap lighthouse pierced the moonless night of April 1, 1946, in Alaska's remote Aleutain Island chain. In the reinforced concrete lighthouse, five men were engaged in various support operations connected with the maintenance of the 80,000 candlepower beam. Perched atop a building constructed 5 years...
