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Page 354, results 8826 - 8850

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Late Miocene mollusks from the Queen Charlotte Islands, British Columbia, Canada
Warren O. Addicott
1978, Journal of Research of the U.S. Geological Survey (6) 677-689
A fauna of bivalve mollusks, scattered gastropods, and an echinoid from exposures of the Skonun Formation in the northeastern part of Graham Island is indicative of an early late Miocene age and correlation with the provincial Wishkahan Stage. The molluscan assemblages are from the upper 600 of the 1800-m-thick marine...
A large landslide on Mars
Baerbel K. Lucchitta
1978, GSA Bulletin (89) 1601-1609
A large landslide deposit on the south wall of Gangis Chasma contains at least 100 billion m3of material that moved 60 km across the trough floor at a speed of more than 100 km/hr. The deposit consists of slump blocks at the head, hummocky material farther out, and a vast...
Refraction studies between Icy Bay and Kayak Island, eastern Gulf of Alaska
K.C. Bayer, R.E. Mattick, T.R. Bruns, George Plafker
1978, Journal of Research of the U.S. Geological Survey (6) 625-636
Results of five seismic refraction lines shot by the U.S. Geological Survey in the Gulf of Alaska between Icy Bay and Kayak Island indicate the following: (1) The Continental Shelf is underlain by as much as 11 km of sedimentary rock of probable Tertiary age where refraction velocities range from 1.2 to 5.5 kilometers per...
Potassium-argon ages of basement rocks from Saint George Island, Alaska
D.M. Hopkins, M.L. Silberman
1978, Journal of Research of the U.S. Geological Survey (6) 435-438
Potassium-argon ages from basement granitic rocks that intrude serpentinized peridotite on St. George Island, Alaska, range from 50 to 57 million years, with an initial argon isochron age. interpreted as a minimum figure, of 52 ± 2 m.y. The age of the granitic rocks and their association with serpentinized peridotite...
Aleuts, sea otters, and alternate stable state communities
C.A. Simenstad, J. A. Estes, K.W. Kenyon
1978, Science (200) 403-411
Reexamination of stratified faunal components of a prehistoric Aleut midden excavated on Amchitka Island, Alaska, indicates that Aleut prey items changed dramatically during 2500 years of aboriginal occupation. Recent ecological studies in the Aleutian Islands have shown the concurrent existence of two alternate stable nearshore communities, one dominated by macroalgae,...
Megalineament in southeastern Alaska marks southwest edge of Coast Range batholithic complex
David A. Brew, A. B. Ford
1978, Canadian Journal of Earth Sciences (15) 1763-1772
The Coast Range megalineament is a prominent, nearly continuous topographic and structural feature that extends southeastward about 550 km (330 mi) from its junction with the Chatham Strait – Lynn Canal fault at Point Sherman to Tongass Passage near the mouth of Pearse Canal where it leaves southeastern Alaska. It probably extends...
A tuya in Togiak Valley, Southwest Alaska
J. M. Hoare, W. L. Coonrad
1978, Journal of Research of the U.S. Geological Survey (6) 193-201
The shape, composition, structure, and location of a conspicuous flat-topped mountain in the lower Togiak Valley, southwest Alaska, all indicate that it formed by a subglacial volcanic eruption of olivine basalt. Volcanoes of this type are known as "tuyas." The Togiak tuya erupted into an intraglacial lake in a hole...
Thermogenic gases in near-surface sediments of Norton Sound, Alaska
C. Hans Nelson, Keith A. Kvenvolden, Edward C. Clukey
1978, Conference Paper
A plume of hydrocarbon gases, assumed to be of thermogenic origin based on chemical compositions, has been noted by others in the water column of Norton Sound about 40 km south of Nome, Alaska. We used detailed geophysical transects, side-scan sonar, underwater television, and chromatographic analyses of gases in near-surface...
Episodes of Aleutian Ridge explosive volcanism
J.R. Hein, D.W. Scholl, J. Miller
1978, Science (199) 137-141
Earlier workers have overlooked deep-sea bentonite beds when unraveling the Cenozoic volcanic history of an area. In the North Pacific, identification of Miocene and older volcanic episodes is possible only if both altered (bentonite) and unaltered ash beds are recognized. Our study, which includes bentonite beds, shows that volcanism on...
Induction of auroral zone electric currents within the Alaska pipeline
W.H. Campbell
1978, Pure and Applied Geophysics PAGEOPH (116) 1143-1173
The Alaskar pipeline is a highly conducting anomaly extending 800 miles (1300 km) from about 62?? to 69?? geomagnetic latitude beneath the most active regions of the ionospheric electrojet current. The spectral behavior of the magnetic field from this current was analyzed using data from standard geomagnetic observatories to establish...
New potassium-argon data on the age of mineralization and metamorphism in the Willow Creek mining district, southern Talkeetna Mountains, Alaska
Miles L. Silberman, Bela Csejtey Jr., James G. Smith, Marvin A. Lanphere, Frederic H. Wilson
1978, Circular 772-B
The now largely abandoned Willow Creek mining district, southern Talkeetna Mountains, Alaska, produced nearly $18,000,000 in gold and minor silver between 1909 and the early 1950's. Mineralized quartz veins, which contain gold and silver along with minor quantities of base metals (in pyrite, galena, chalcopyrite, sphalerite, molybdenite, and arsenopyrite), cut...