Glaciation on the continental margin off New England
Richard M. Pratt, John Schlee
1969, Geological Society of America Bulletin (80) 2335-2341
The Pleistocene glacial limit in the marine environment off New England can be traced by plotting the seaward limit of abundant sandy gravel and the position of shoals. Maximum limit of the last glaciation was probably along an irregular line extending through Nantucket Shoals, across...
Casing detector and self-potential logger
Michael H. Frimpter
1969, Groundwater (7) 24-27
A simple and rapid method of determining casing length and permeable zones in wells tapping bedrock can be useful to well drillers and hydrologists. A device consisting of a galvanometer, a reel of insulated wire, and a copper...
Fission-track ages of accessory minerals from granitic rocks of the central Sierra Nevada batholith, California
C. W. Naeser, F. C. W. Dodge
1969, Geological Society of America Bulletin (80) 2201-2211
Ages of apatite, sphene, allanite, epidote, and garnet from plutonic rocks of the central Sierra Nevada and Inyo Mountains have been determined by the fission-track method.Ages of 44 specimens of apatite range from 54 to 128 m.y. Oldest apatites generally occur in rocks from the western portion of the batholith;...
On the use of magnetic cleaning in paleointensity studies
Richard R. Doell, Peter J. Smith
1969, Journal of Geomagnetism & Geoelectricity (21) 579-594
The use of partial alternating field demagnetization and, to a lesser extent, partial thermal demagnetization has been found useful as a means of removing secondary components of magnetization from rocks used in certain methods of determining paleointensities. During the course of this investigation, which was carried out on lavas erupted...
Seismic activity and faulting associated with a large underground nuclear explosion
R. M. Hamilton, F. A. McKeown, J. H. Healy
1969, Science (166) 601-604
The 1.1-megaton nuclear test Benham caused movement on previously mapped faults and was followed by a sequence of small earthquakes. These effects were confined to a zone extending not more than 13 kilometers from ground zero; they are apparently related to the release of natural tectonic strain....
Effect of rainfall variability on streamflow simulation
D.R. Dawdy, James M. Bergmann
1969, Water Resources Research (5) 958-966
Three recording rain gages in a 9.7‐square‐mile basin in southern California were used with a deterministic rainfall‐runoff model to simulate flood hydrographs and peaks and to assess the effects of data errors on simulation results. Bias in the estimation of effective basin rainfall seemed to result in curve fitting parameter...
International geophysics: Symposium on the hydrology of deltas
Ted Arnow
1969, Eos Science News (50) 556-556
A Symposium on the Hydrology of Deltas was held in Bucharest, Romania, on May 6–9; it was followed by a field trip to the delta of the Danube River on May 10–14. The Symposium was organized by Unesco, with the collaboration of the Romanian Government and the support of the...
The use of Schlumberger and equatorial soundings in groundwater investigations near El Paso, Texas
Adel A. R. Zohdy
1969, Geophysics (34) 713-728
Electrical soundings using the symmetric AMNB Schlumberger and the bipole-dipole equatorial arrays were made along two profiles near El Paso, Texas, in support of a groundwater exploration program which included seismic refraction and gravity surveys. Electrode spacings (AB/2 or R) reaching 12,000 ft allowed exploration to depths of about 7000...
The U.S. Geological Survey's gravity program in California
Howard W. Oliver
1969, Eos Science News (50) 543-545
Since the 1963 gravity symposium, the U.S. Geological Survey has entered into a cooperative program with the California Division of Mines and Geology, the Army Map Service, and several universities for the purpose of completing a 5-mgal Bouguer gravity map of the entire State of California at a scale of...
Progress on a gravity map of Alaska
David F. Barnes
1969, Eos Science News (50) 550-552
The U.S. Geological Survey began gravity surveys in Alaska ten years ago with local surveys in the Copper River and Tanana Basins. Shortly before the 1963 AGU gravity symposium [Barnes, 1965], the emphasis shifted from local surveys to the preparation of a reconnaissance gravity map of the whole state with...
The structure and tectonic history of the eastern Aleutian Trench
Roland E. von Huene, George G. Shor Jr.
1969, Geological Society of America Bulletin (80) 1889-1902
The tectonic character of the eastern Aleutian Trench and some major events in its geologic history can be estimated from nine continuous seismic reflection records. A section of pre-trench, deep oceanic sediments rests on the down-warped crust that forms the trench. Nearly horizontal undeformed strata that unconformably overlie this deep...
Significance of lineation and minor folds near major thrust faults in the southern Appalachians and the British and Norwegian Caledonides
Bruce Bryant, John C. Reed Jr.
1969, Geological Magazine (106) 412-429
The Blue Ridge thrust sheet is one of the principal thrust masses of metamorphic rocks in the southern Appalachians. A broad zone of sheared and retrogressively metamorphosed rocks near the sole of the thrust sheet around the Grandfather Mountain window displays numerous small tight or isoclinal folds having axes subparallel...
Rheology of basalt in the melting range
Herbert R. Shaw
1969, Journal of Petrology (10) 510-535
Experimental data have been obtained for viscosities of tholeiite melts at temperatures from 1300 to 1120 °Cat 1 atm, using a concentric cylinder viscometer. The apparent viscosity increases more than two orders of magnitude between 1200 and 1120 °C (0–25 per cent crystallization) for shear rates of about 10 sec-1 and...
The U.S. Geological Survey's gravity program in the Rocky Mountain and Basin Range areas
M. Dean Kleinkopf, Donald L. Peterson
1969, Eos, Transactions, American Geophysical Union (50) 529-531
Most of the gravity surveys of the U.S. Geological Survey have been support programs in connection with regional geologic structural studies, ground-water investigations, and heavy-metals exploration. Many of the studies were undertaken in conjunction with geological mapping and mineral...
Standardization of gravimeter calibrations in the geological survey
David F. Barnes, Howard W. Oliver, Stephen L. Robbins
1969, Eos Science News (50) 526-527
The calibration of gravimeters has long been primarily the concern of geodesists involved in measuring large gravity differences, but recent developments suggest that the precision and stability of gravimeter calibrations may have greater geologic importance in the future. First, the use of high-speed computers and an increasing variety of supplemental...
A comparison of methods used to obtain age ratios of snow and Canada geese
Kenneth F. Higgins, R. L. Linder, P. F. Springer
1969, Journal of Wildlife Management (33) 949-956
The validity of group counts, cannon-net catches, and hunter-bag checks for estimating productivity of lesser snow geese (Anser caerulescens caerulescens) and small Canada geese (Branta canadensis hutchinsii-parvipes complex) was studied at Sand Lake National Wildlife Refuge during the falls of 1965 and 1966. Age ratios of snow geese obtained from...
Some aspects of the effects of the quantity and quality of water on biological communities in Everglades National Park
Milton C. Kolipinski, Aaron L. Higer
1969, Open-File Report FL 69-007
No abstract available....
Inorganic composition of gallbladder bile from fasted rainbow trout
Joseph B. Hunn
1969, Progressive Fish-Culturist (31) 221-222
Abstract not available. ...
Establishing hunting regulations and allowable harvest of mallards in the United States
A. D. Geis, R. K. Martinson, David R. Anderson
1969, Journal of Wildlife Management (33) 848-859
As a major part of establishing hunting regulations each year in the United States, data for the mallard (Anas platyrhynchos) are examined extensively to estimate the effect of various harvest strategies on the breeding population the following spring. This requires estimates of the breeding-population level and of the production, harvest,...
Bursal depths of lesser snow and small Canada geese
Kenneth F. Higgins
1969, Journal of Wildlife Management (33) 1006-1008
Bursa of Fabricius depths of 88 lesser snow geese (Anser c. caerulescens) and 69 small Canada geese (Branta canadensis hutchinsii/parvipes complex) were measured. Bursal depths were unreliable indicators of age-classes of lesser snow geese and small Canada geese; previously, the same had been found to be true for large Canada...
Waterfowl production in relation to grazing
L.M. Kirsch
1969, Journal of Wildlife Management (33) 821-828
A 4-year production study of upland nesting waterfowl on the Missouri Coteau area of North Dakota showed that pair numbers, nesting densities and nest success were generally reduced by grazing. It is suggested that cover removal such as regular grazing and mowing be discontinued on areas managed primarily for waterfowl...
Flow of a disperse emulsion of crude oil in water in porous media
John C. Cartmill, Parke A. Dickey
1969, Conference Paper, Fall meeting of the Society of Petroleum Engineers of AIME
It has been suggested that oil migrates through reservoir sands in the form of a fine, disperse emulsion of oil in water, and that oil accumulations occur where the stream enters finer-grained rock such as silt or shale. In order to investigate the possible mechanisms, stable emulsions of oil in...
Potassium-argon ages bearing on the igneous and tectonic history of the Elk Mountains and vicinity, Colorado: A preliminary report
John D. Obradovich, Felix E. Mutschler, Bruce Bryant
1969, Geological Society of America Bulletin (80) 1749-1756
K-Ar ages for epizonal plutonic rocks together with field studies indicate that uplift of the Sawatch Range began at least 72 m.y. ago. Vertical uplift of the Sawatch Range was followed or accompanied by gravity sliding of sedimentary rocks along the Elk Range thrust fault. The greatest volume of exposed...
Thermal additions and epifaunal organisms at Chalk Point, Maryland
Jon W. Nauman, Robert L. Cory
1969, Chesapeake Science (10) 218-226
Two sets of test panels, one in the intake and the other in the effluent canal of a steam-generating station, were submerged at monthly intervals in 1967. The panels were analyzed for epifaunal species composition, abundance, seasonal attachment, and total biomass production. The average surface-water temperature rose 6.3 C above...
Possible relation of mineralization to thermal springs in the Creede District, San Juan mountains, Colorado; a discussion
Thomas A. Steven
1969, Economic Geology (64) 696-698
No abstract available....
