Progradational sequences in Miocene shoreline deposits, southeastern Caliente Range, California
H. Edward Clifton
1981, Journal of Sedimentary Petrology (51) 165-184
An exceptionally well exposed marine-nonmarine transition in middle Miocene strata exists in the southeastern Caliente Range, California. About 50 individual progradational sequences form a succession that ranges in thickness from approximately 1000 m (where predominantly nonmarine) to more than 2500 m (where predominantly marine). Paleogreographic evidence in basalt flows near...
Modeling natural gas reservoirs: A simple model
Richard S. Collier, E.A. Monash
1981, Society of Petroleum Engineers journal (21) 521-526
A mathematical model is developed and tested for the production of natural gas with water encroachment and gas entrapment. The model is built on the material and volumetric balance relations, the Schilthuis water drive model, and a gas entrapment mechanism which assumes that the rate of gas entrapment is proportional...
A diver operated reverse corer to collect samples of unconsolidated coarse sand
Roberto J. Anima
1981, Journal of Sedimentary Petrology (51) 653-654
No abstract available...
The National Coal Resources Data System: A status report
M. Devereaux Carter, Antoinette L. Medlin, Kathleen K. Krohn
1981, Geological Society of America Bulletin (92) 563-573
The National Coal Resources Data System (NCRDS) of the U.S. Geological Survey is an interactive computerized storage, retrieval, and display system to assess the quantity and quality of the nation's coal resources. It has been developed to provide geological coal-resource data currently available, to update that data, and to...
Uranium-series and soil-geomorphic dating of the Calico archaeological site, California
James L. Bischoff, Roy J. Shlemon, T. L. Ku, R.D. Simpson, Robert J. Rosenbauer, Budinger
1981, Geology (9) 576-582
Lithic specimens identified as artifacts have been recovered from near the base of the Yermo fan deposits at Calico, California. The soil on the fan surface is a strongly developed relict paleosol. Comparison of this soil with dated paleosols elsewhere in the southwestern United States suggests that the surface is...
Temporal and spatial variations in suspended matter in continental shelf and slope waters off the north-eastern United States
Michael H. Bothner, Carol M. Parmenter, John D. Milliman
1981, Estuarine, Coastal and Shelf Science (13) 213-234
Seston in waters of Georges Bank originates primarily from biological production and from resuspension of bottom sediments. The concentrations of suspended matter observed on the central shoals are more influenced by storms than by seasonal changes. Winter storms produce highest concentrations of non-combustible material throughout the water column, and summer...
Estimation of depth to magnetic source using maximum entropy power spectra, with application to the Peru-Chile Trench
Richard J. Blakely
1981, Memoir of the Geological Society of America (154) 667-682
Estimations of the depth to magnetic sources using the power spectrum of magnetic anomalies generally require long magnetic profiles. The method developed here uses the maximum entropy power spectrum (MEPS) to calculate depth to source on short windows of magnetic data; resolution is thereby improved. The method operates by dividing...
Late Quaternary environmental history of Lake Valencia, Venezuela
J. Platt Bradbury, B. Leyden, M.R. Baker, W.M. Lewis Jr., C. Schubert, M.W. Binford, D.R. Whitehead, F.H. Weibezahn
1981, Science (214) 1299-1305
Chemical, paleontological, and mineralogical analyses of a 7.5-meter core from the middle of Lake Valencia, Venezuela, have provided information on the paleoclimatic history of this low-elevation, low-latitude site for the last 13,000 years. The data show that dry climates existed in this region from 13,000 years before present (B.P.) until...
Organochlorine residues in fish: National Pesticide Monitoring Program, 1970-74
Christopher J. Schmitt, J. Larry Ludke, D. F. Walsh
1981, Pesticides Monitoring Journal (14) 136-206
As part of the National Pesticide Monitoring Program, the U.S. Fish and Wildlife Service analyzed organochlorine contaminant residues in fish samples collected from about 100 stations each year from 1970 to 1974. During this period, mean residues of DDT and its metabolites declined nationally but remained widespread, and high concentrations...
Deep volcanic tremor and magma ascent mechanism under Kilauea, Hawaii
Keiiti Aki, Robert Y Koyanagi
1981, Journal of Geophysical Research B: Solid Earth (86) 7095-7109
Deep harmonic tremor originating at depths around 40 km under Kilauea was studied using records accumulated since 1962 at the Hawaii Volcano Observatory of the U.S. Geological Survey. The deep source of the tremor was determined by onset times and confirmed by the relative amplitude across the island-wide network of...
United States gold resource profile
S.M. Cargill
1981, Economic Geology (76) 937-943
No abstract available...
Earth flows along Henry Creek, northern Alaska
L. David Carter, John Galloway
1981, Arctic (34) 325-328
Many earth flows occurred during the summer of 1979 in the hilly terrain near Umiat, Alaska, particularly along Henry Creek. Most were shallow, involving only the tundra mat and no more than 1.5 m of the underlying mud. The summer of 1979 was the warmest and wettest for the period...
Decontaminating and recycling zinc bromide solution used in sink-float separation of kerogen
Charles E. Barker
1981, Journal of Sedimentary Research (51) 666-667
No abstract available...
Seismic zonation in the San Francisco Bay region
E. E. Brabb
1981, Conference Paper, Proceedings: Social and economic impact of earthquakes on utility lifelines: Seismic considerations in lifelines planning, siting and design: Construction Division specialty conference
No abstract available....
A geologic reconnaissance of the Cycladic blueschist belt, Greece
M. Clark Blake Jr., Michel Bonneau, Jacques Geyssant, J.R. Kienast, Claude Lepvrier, Henri Maluski, Dimitrios Papanikolaou
1981, GSA Bulletin (92) 247-254
The Cycladic blueschist belt consists of two distinctive segments separated by a broad zone of superposed granitic and high-temperature metamorphic rocks. The northern segment contains early metamorphic fold axes and parallel glaucophane lineations that trend ∼060° with a progressive increase in metamorphism toward the southeast. The southern segment contains similar...
In the southwest: Tectonic evolution reviewed
D. M. Miller, Keith A. Howard, M. D. Carr
1981, Geotimes (26) 16-18
No abstract available....
Proterozoic zircon from augen gneiss, Yukon-Tanana Upland, east-central Alaska
John N. Aleinikoff, Cynthia Dusel-Bacon, Helen L. Foster, Kiyoto Futa
1981, Geology (9) 469-473
U-Th-Pb analyses of zircons from an ortho-augen gneiss body in the Yukon-Tanana Upland of east-central Alaska yield strong evidence for the presence of early Proterozoic material in this area. U-Pb data define a chord that intersects concordia at about 2,300 and 345 m.y. We consider two interpretations: (1) the protolith...
Chrysophyte cysts as potential environmental indicators
David P. Adam, Albert D. Mahood
1981, Geological Society of America Bulletin (92) 839-844
Many Chrysophyte algae produce morphologically distinctive, siliceous, microscopic cysts during a resting stage of their life cycles; these cysts are often preserved in sediments. Scanning electron microscopy and Nomarski optics permit much more detailed observation of these cysts than was heretofore possible. We have used an ecologic and biogeographic approach...
Rare-earth element geochemistry of the island-arc volcanic rocks of Rabaul and Talasea, New Britain
Joseph G. Arth
1981, Geological Society of America Bulletin (92) 858-863
The island-arc volcanic rocks of Rabaul and Talasea, New Britain, range in composition from basalt through rhyolite. Rare-earth elements have been determined by mass-spectrometric isotope dilution in 16 samples. Chondrite-normalized rare-earth element patterns are distinct for each volcanic center, but all are relatively flat (Ce/YbE.F. = 1.1 to 3.0). Within...
Lower Eocene alluvial paleosols (Willwood Formation, Northwest Wyoming, U.S.A.) and their significance for paleoecology, paleoclimatology, and basin analysis
Thomas M. Bown, M. J. Kraus
1981, Palaeogeography, Palaeoclimatology, Palaeoecology (34) 1-30
The lower Eocene Willwood Formation of northwest Wyoming is a 700 m thick accumulation of alluvial floodplain and channel mudstones and sandstones, nearly all of which show paleopedogenic modifications. Pedogenesis of Willwood sandstones is indicated by taproot and vertebrate and invertebrate bioturbation, early local cementation by calcium carbonate, and thin...
Road log
T.M. Berg, G.H. Crowl, W.E. Edmunds, P.B. Luce, W. D. Sevon, P. Wilshusen, Donald L. Woodrow, H. A. Pohn, editor(s)
1981, Conference Paper, Guidebook for the 46th Annual Field Conference of Pennsylvania Geologists
No abstract available...
On the use of nonlinear soil models
Albert T.F. Chen
1981, Conference Paper, Proceedings: First International Conference on Recent Advances in Geochemical Earthquake Engineering and Soil Dynamics
The basic definitions of, and the differences between, currently available soil models are reviewed. These models are applied to site response analyses where two depths and two levels of base input motion are considered. Computational results are presented and compared with regard to the effects of using different soil models...
Changes in the Seismicity and Focal Mechanism of Small Earthquakes Prior to an MS 6.7 Earthquake in the Central Aleutian Island Arc
Serena Billington, E.R. Engdahl, Stephanie Price
1981, Book chapter, Earthquake prediction—Addresses, essays, lectures
On November 4 1977, a magnitude Ms 6.7 (mb 5.7) shallow-focus thrust earthquake occurred in the vicinity of the Adak seismographic network in the central Aleutian island arc. The earthquake and its aftershock sequence occurred in an area that had not experienced a similar sequence since at least...
Rectangular harmonic analysis applied to the geomagnetic field
L.R. Alldredge
1981, Journal of Geophysical Research B: Solid Earth (86) 3021-3026
Spherical harmonic analysis of the earth's magnetic field is limited in the resolution that can be obtained. This limitation is caused by inadequacies of computers and of available data sets. The fundamental wavelength in spherical harmonic analysis is the circumference of the earth. To resolve wavelengths as short as 100...
Potential source for crushed granite aggregate in Heard County, Georgia
R. L. Atkins, Michael W. Higgins, Robert P. Dickerson
1981, Report
The production of crushed stone suitable for highway and general construction is a major industry in Georgia. The state ranks eighth in the nation in overall crushed stone production, and first in crushed granite production. Crushed stone production in Georgia in 1979 was 40,902,000 short tons worth $154,021,000 (D.H. White,...
