Mesozoic California and the underflow of Pacific mantle
Warren Hamilton
1969, Geological Society of America Bulletin (80) 2409-2429
The Mesozoic evolution of California is interpreted as dominated by the underflow of oceanic mantle beneath the continental margin. Underflow during part of Late Cretaceous time of more than 2000 km of the eastern Pacific plate seems required by the marine magnetic data. Correspondingly, varied oceanic environments—abyssal hill, island arc,...
U-Th-Pb chronology of zircons from the St. Kevin Granite, northern Sawatch Range, Colorado
Bruce R. Doe, Robert C. Pearson
1969, Geological Society of America Bulletin (80) 2495-2502
Three samples of zircon from the St. Kevin Granite, northern Sawatch Range, Colorado, were analyzed for uranium, thorium, and lead content and for lead isotopic composition; the concentrated HNO3 leaches of the zircons were similarly analyzed. The concordia age on the zircons was interpreted to be 1420 ± 40 m.y., an...
The A. J. Collier Thrust Belt of the Seward Peninsula, Alaska
C.L. Sainsbury
1969, Geological Society of America Bulletin (80) 2595-2596
No abstract available....
Lake eutrophication— A natural process
Phillip E. Greeson
1969, Journal of the American Water Resources Association (JAWRA) (5) 16-30
Lake eutrophication is an economic, recreational, and aesthetic problem that affects every lake of the world. Eutrophication is the natural process of lake aging, and progresses irrespective of man's activities. Pollution, however, can hasten the natural rate of aging and shorten the life expectancy of a body of water. The...
Relation of sea water to fresh water in carbonate rocks in coastal areas, with special reference to Florida, U.S.A., and Cephalonia (Kephallinia), Greece
V. T. Stringfield, H. E. LeGrand
1969, Journal of Hydrology (9) 387-404
The principles controlling the equilibrium between the denser salty water and the lighter fresh water in coastal aquifers apply to carbonate as well as sand systems. However, under certain equilibrium conditions of fresh and salt water in parts of some carbonate aquifers unusual hydrologic phenomena result. Hydrologic conditions at Tarpon...
Potassium-argon ages on lavas of Kohala Volcano, Hawaii
Ian McDougall
1969, Geological Society of America Bulletin (80) 2597-6000
Kohala Mountain is regarded as the oldest volcano on the island of Hawaii. Potassium-argon ages on three lavas of the Hawi Volcanic Series, the youngest sequence of lavas on Kohala, range from 0.14 to 0.20m.y. and indicate that volcanism ceased in the very late Pleistocene....
Mean streamflow from discharge measurements
H. C. Riggs
1969, International Association of Scientific Hydrology - Bulletin (14) 95-110
Mean flow of a stream is usually computed from a continuous record of flow ai a gaging station. A less costly method consists of (1) estimating 12 individual monthly flows from one discharge measurement per month and a concurrent gaging station record on a nearby stream, using a...
Merumite occurrence in Guyana
C. Milton, S Narain
1969, Economic Geology (64) 910-914
Merumite was discovered with associated diamonds and gold in 1937 in gravels of the Merume River in Guyana. It was described as essentially a hydrous chromium oxide that contains more than 80 percent Cr2Oa. Milton and Chao in 1958 found it to be a complex aggregate, mainly eskolaite (Cr2Oa) with...
Yersinia philomiragia sp. n., a new member of the Pasteurella group of bacteria, naturally pathogenic for the muskrat (Ondatra zibethica)
W. I. Jensen, C.R. Owen, W.L. Jellison
1969, Journal of Bacteriology (100) 1237-1241
A bacterium experimentally pathogenic for muskrats (Ondatra zibethica), white mice, mountain voles (Microtus montanus), and deer mice (Peromyscus maniculatus) was isolated from the tissues of a sick muskrat captured on the Bear River Migratory Bird Refuge (Brigham City, Utah) and from four surface water samples collected within 15 miles of...
The role of larval Chironomidae in the production of lacustrine copropel in Mud Lake, Marion County, Florida
A. J. Iovino, W. H. Bradley
1969, Limnology and Oceanography (14) 898-905
Mud Lake is a shallow (avg 45 cm), alkaline (pH 7.7–10.2), brown‐water lake having an area of about 180 ha. A study of its organic sediment was undertaken because it appears to be a present‐day analogue of the richly organic lacustrine oozes that were the precursors of the oil shales...
Lherzolite, anorthosite, gabbro, and basalt dredged from the Mid-Indian Ocean Ridge
C.G. Engel, R.L. Fisher
1969, Science (166) 1136-1141
The Central Indian Ridge is mantled with flows of low-potassium basalt of uniform composition. Gabbro, anorthosite, and garnet-bearing lherzolite are exposed in cross fractures, and lherzolite is the bedrock at the center of the ridge. The lherzolites are upper-mantle rock exposed by faulting....
Profiles of regional ground-water flow in glacial deposits in Minnesota based on existing well data
W. A. Van Voast
1969, Conference Paper
No abstract available....
Ground water for irrigation near Lake Emily, Pope County, west-central Minnesota
W. A. Van Voast
1969, Report
No abstract available....
Graphs of ground-water levels in Minnesota, 1962-1966
W. A. Miller, G.C. Straka
1969, Report
No abstract available....
Implications of the Surveyor 7 results
R. A. Phinney, J. A. O’Keefe, J. B. Adams, D. E. Gault, G. P. Kuiper, H. Masursky, R. J. Collins, Eugene Merle Shoemaker
1969, Journal of Geophysical Research (74) 6053-6080
The chemical and television data from the Surveyor 7 mission are discussed. The significance of the α-scattering analysis is found to depend on whether the flow unit underlying the spacecraft was laid down by mass flow at the time of the Tycho-forming impact. The chemical composition of...
Zircon ages of felsic volcanic rocks in the upper Precambrian of the Blue Ridge, Appalachian mountains
D.W. Rankin, T. W. Stern, J. C. Reed Jr., M. F. Newell
1969, Science (166) 741-744
Five zircon samples from Pennsylvania, Virginia, and North Carolina yield discordant uranium-lead ages which suggest an original age of 820 million years and an episodic lead loss at 240 million years. The indicated age of lead loss is interpreted as the age of movement of the Blue Ridge thrust sheet....
The new federal OCS regulations in the light of Santa Barbara
Russell G. Wayland
1969, Conference Paper, SPE California regional meeting
When the first Outer Continental Shelf leases were issued in 1954, the oil industry was operating near shore in shallow waters. Although regional OCS Orders issued under the regulations have been kept reasonably up to date with advancing technology, the Secretary's regulations had not undergone a complete review by the...
Great Salt Lake, Utah: Chemical and physical variations of the brine, 1963-1966
D. C. Hahl, A.H. Handy
1969, Utah Geological and Mineralogical Survey Water-Resources Bulletin 12
Great Salt Lake is a shallow, closed-basin lake in northern Utah. Its surface area and concentration of dissolved solids vary in response to both annual and long-term climatic changes. The lake gains water mainly as streamflow from mountains to the east and loses water through evaporation. In 1965, at a...
Mud Lake, Florida: Its algae and alkaline brown water
W. H. Bradley, M. E. Beard
1969, Limnology and Oceanography (14) 889-897
Mud Lake (Marion County, Florida), in the Ocala National Forest, is elliptical, has an area of ca. 180 ha, and a mean depth of less than 50 cm. The water contains about 200 ppm dissolved solids, ranges from brown to nearly colorless (15 to 100 Pt units),...
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...
