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...
Economic geology of Tioga and Bradford Counties
P.B. Luce, W.E. Edmunds
1981, Conference Paper, Guidebook for the 46th Annual Field Conference of Pennsylvania Geologists
No abstract available...
An informal palynologic zonation for the cretaceous system of the United States mid‐Atlantic (Baltimore canyon area) outer continental shelf
John W. Bebout
1981, Palynology (5) 159-194
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...
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...
Conceptual models governing leaching behavior and their long-term predictive capability
Hans C. Claassen
1981, Nuclear and Chemical Waste Management (2) 307-313
Six models that may be used to describe the interaction of radioactive waste solids with aqueous solutions are as follows:Simple linear mass transfer;Simple parabolic mass transfer;Parabolic mass transfer with the formation of a diffusion-limiting surface layer at an arbitrary time;Initial parabolic mass transfer followed by linear mass transfer at an...
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...
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...
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...
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...
In the southwest: Tectonic evolution reviewed
D. M. Miller, Keith A. Howard, M. D. Carr
1981, Geotimes (26) 16-18
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...
Comparison of uranium-series, radiocarbon, and amino acid data from marine molluscs, Baffin Island, Arctic Canada
Barney J. Szabo, G. H. Miller, J. T. Andrews, M. Stuiver
1981, Geology (9) 451-457
Uranium-series and 14C dates and the extent of amino acid racemization are reported for 24 marine shell samples from three areas of Baffin Island, Arctic Canada. When the radiometric dates are plotted against the ratio of D-alloisoleucene:L-isoleucene in the shells, five broad age groups are recognized. The uranium-series data indicate...
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,...
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...
Linear island and seamount chains, aseismic ridges and intraplate volcanism: Results from DSDP
David A. Clague
1981, SEPM Special Publication (32) 7-22
The Deep Sea Drilling Project drilled a substantial number of sites that bear on the origin of linear island and seamount chains, aseismic ridges and other more regional expressions of intraplate volcanism. Drilling in the Emperor Seamounts during Leg 55 was particularly successful. Results from this leg include: 1)...
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...
Sedimentology of Great Sand Dunes, Colorado
Sarah Andrews
1981, SEPM Special Publication 31
Eolian and adjacent deposits of Great Sand Dunes Colorado form a small but sedimentologically complex deposit Eolian sediments can be subdivided into three provinces trending downwind northeast I low as much as 10 m high alkali cemented dunes forming discontinuous rings around broad flat bottomed ephemeral lakes II undulating vegetated...
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...
Mid-Cretaceous radiolarians in Perapedhi Formation
W. P. Irwin, B.L. Murchey, D. L. Jones, S.A. Kling
1981, Ofioliti (5) 265-265
No abstract available....
The Franciscan assemblage and related rocks in northern California: A reinterpretation
1981, Book chapter, The geotectonic development of California: Rubey memorial volume
No abstract available....
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...
Geologic transect of the northern Diablo Range, California
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....
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...
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...
