D. M. Miller, Keith A. Howard, M. D. Carr
1981, Geotimes (26) 16-18
No abstract available....
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Page 5483, results 137051 - 137075
Publication Extents
Not all publications have extents, not all extents are completely accurateM. Clark Blake Jr., A. S. Jayko, D. G. Howell
1981, Oceanologica Acta (12) 267-272
No abstract available....
1981, Book chapter, The geotectonic development of California: Rubey memorial volume
No abstract available....
M. Clark Blake Jr.
1981, Conference Paper, Upper Mesozoic Franciscan Rocks and Great Valley Sequence, Central Coast Ranges, California: Field Trip Guide V
No abstract available....
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...
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...
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...
T.J. Armbrustmacher
1981, Book chapter, New Mexico Geological Society Guidebook
No abstract available...
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...
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...
S.M. Cargill
1981, Economic Geology (76) 937-943
No abstract available...
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...
C. J. Orth, J. S. Gilmore, J.D. Knight, C. L. Pillmore, R.H. Tschudy, J.E. Fassett
1981, Science (214) 1341-1343
An iridium abundance anomaly, with concentrations up to 5000 parts per trillion over a background level of 4 to 20 parts per trillion, has been located in sedimentary rocks laid down under freshwater swamp conditions in the Raton Basin of northeastern New Mexico. The anomaly occurs at the base of...
J. Platt Bradbury, B. Leyden, M. Salgado-Labouriau, W.M. Lewis Jr., C. Schubert, M.W. Binford, D.G. Frey, 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...
W.H. Prescott, Michael Lisowski, James C. Savage
1981, Journal of Geophysical Research B: Solid Earth (86) 10853-10869
Analysis of a geodetic network of 115 lines crossing the San Andreas, Hayward, and Calaveras faults in the vicinity of San Francisco Bay and measured repeatedly between 1970 and 1980 has revealed details about the accommodation of relative plate motion in this area. The most striking result is that the...
Richard S. Williams Jr., Elliot C. Morris
1981, Book chapter, Reports Of planetary geology program: 1981
In 1959, Sigurdur Thorarinsson published his first complete classification of the 13 principal types of basaltic volcanoes of Iceland (Figure 1). In 1968, Thorarinssonpublished a modification of his earlier classification scheme. Both landform classifications were based on the relationship of the type of eruptive products (lava, lava and tephra, or...
Ralph Leroy Erickson
1981, Report
No abstract available....
David J. Hoffman, W. C. Eastin Jr.
1981, Environmental Research (26) 472-485
The effects of external exposure of mallard (Anas platyrhynchos) eggs to malathion, diazinon, and parathion were examined using formulations and concentrations similar to field applications. Treatment with aqueous emulsion simulated exposure at the rate of 100 gal per acre (153 liters/hectare) with three to six different doses per compound with...
Eugene Merle Shoemaker, Carolyn S. Shoemaker, E. F. Helin, S. J. Bus, R. F. Wolfe
1981, Book chapter, Reports of Planetary Geology Program — 1981
A new method of search for relatively bright Mars-crossing asteroids with the Palomar 46-cm Schmidt camera was initiated in 1980. Selected fields photographed with the 46-cm Schmidt were systematically reduced for all asteroids detected on the films. The 46-cm Schmidt fields have an effective diameter of 8 3/4 degrees. Kodak...
John R. Dingler
1981, Marine Geology (44) 241-252
Monastery Beach at Carmel, California, is a pocket beach composed of very coarse to granular sediment. In profile, the beach has a well-defined berm crest; a steep foreshore; and a gently sloping, barless offshore covered by large, long-crested oscillation ripples. Carmel Submarine Canyon heads a few hundred meters offshore of...
R.Z. Poore
1981, Marine Micropaleontology (6) 599-616
Quantitative analyses of planktonic foraminiferal assemblages from Deep Sea Drilling Project (DSDP) Holes 334 and 410 demonstrate that subpolar and subtropical faunal provinces existed in the North Atlantic during the late Miocene. Climatic oscillations are clearly recorded in Hole 410 by variations in abundance of the Neogloboquadrina subpolar assemblage. These climatic oscillations...
F.T. Manheim, C. K. Paull
1981, Journal of Hydrology (54) 95-105
Investigations of formation-fluid salinities in a transect from western Georgia to the edge of the Blake Plateau off the coast of Georgia show surprisingly similar hydrochemical features offshore and onshore. A fresh-brackish wedge of groundwater (<25 g/kg total dissolved solids) lies beneath the shelf to a depth of ∼ 900...
Sterling C. Keeley, Jon E. Keeley, S. M. Hutchinson, A. W. Johnson
1981, Ecology (62) 1608-1621
Postfire succesion of the temporary herbaceous and suffrutescent cover was studied after chaparral fires in San Diego County, California, USA. Four categories of species make up the temporary cover. (1) "Generalized herbaceous perennials" are present before and after fire. Populations of these herbs are sparse under the shrub canopy. They...
Gerta Keller
1981, Marine Micropaleontology (6) 535-551
Biostratigraphic correlation based on microfossil datum levels, directly or indirectly tied to the paleomagnetic time scale, provides a high resolution time control for the Miocene in the equatorial and middle latitude North Pacific. Faunal changes and abundance fluctuations of planktic foraminiferal species combined with the oxygen Pacific. Faunal changes and...
K. Cartwright, R. H. Gilkeson, T.M. Johnson
1981, Journal of Hydrology (54) 357-369
Present regulations assume that long-term isolation of hazardous wastes - including toxic chemical, biological, radioactive, flammable and explosive wastes - may be effected by disposal in landfills that have liners of very low hydraulic conductivity. In reality, total isolation of wastes in humid areas is not possible; some migration of...