The Mount Edgecumbe tephra deposits, a marker horizon in southeastern Alaska near the Pleistocene-Holocene boundary
J.R. Riehle, D.H. Mann, D.M. Peteet, D.R. Engstrom, D. A. Brew, C.E. Meyer
1992, Quaternary Research (37) 183-202
Late Pleistocene tephra deposits found from Sitka to Juneau and Lituya Bay are assigned to a source at the Mount Edgecumbe volcanic field, based on similarity of glass compositions to nearvent deposits and on thinning away from Kruzof Island. The sequence of near-vent layers is basaltic andesite and andesite at...
Implementation of softcopy photogrammetric workstations at the US Geological Survey
C.D. Skalet, G.Y.G. Lee, L. J. Ladner
1992, Photogrammetric Engineering and Remote Sensing (58) 57-63
The US Geological Survey has provided the Nation with primary quadrangle maps and map products for the last 50 years. The Survey recently completed initial coverage of the conterminous United States and Hawaii at 1:24 000 scale. In Alaska, complete coverage exists at 1:63 360 scale. Effort is underway to...
Submarine sedimentary features on a fjord delta front, Queen Inlet, Glacier Bay, Alaska
Paul R. Carlson, Ross D. Powell, Andrew C. Phillips
1992, Canadian Journal of Earth Sciences (29) 565-573
Side-scan sonar images provide a view of an actively changing delta front in a marine outwash fjord in Glacier Bay, Alaska. Numerous interconnected gullies and chute-like small channels form paths for the transport of sand and coarse silt from the braided glacial outwash streams on the delta plain to the...
Paleoecology of late-glacial peats from the bering land bridge, Chukchi Sea shelf region, northwestern Alaska
S. A. Elias, S. K. Short, R. L. Phillips
1992, Quaternary Research (38) 371-378
Insect fossils and pollen from late Pleistocene nonmarine peat layers were recovered from cores from the shelf region of the Chukchi Sea at depths of about 50 m below sea level. The peats date to 11,300-11,000 yr B.P. and provide a limiting age for the regional Pleistocene-Holocene marine transgression. The...
Computer Monte Carlo simulation in quantitative resource estimation
D. H. Root, W. D. Menzie, W.A. Scott
1992, Nonrenewable Resources (1) 125-138
The method of making quantitative assessments of mineral resources sufficiently detailed for economic analysis is outlined in three steps. The steps are (1) determination of types of deposits that may be present in an area, (2) estimation of the numbers of deposits of the permissible deposit types, and (3) combination...
The plinian eruptions of 1912 at Novarupta, Katmai National Park, Alaska
J. Fierstein, W. Hildreth
1992, Bulletin of Volcanology (54) 646-684
The three-day eruption at Novarupta in 1912 consisted of three discrete episodes. Episode I began with plinian dispersal of rhyolitic fallout (Layer A) and contemporaneous emplacement of rhyolitic ignimbrites and associated proximal veneers. The plinian column was sustained throughout most of the interval of ash flow generation, in spite of...
Pyroclastic deposits of the Mount Edgecumbe volcanic field, southeast Alaska: eruptions of a stratified magma chamber
J.R. Riehle, D.E. Champion, D. A. Brew, M. A. Lanphere
1992, Journal of Volcanology and Geothermal Research (53) 117-143
The Mount Edgecumbe volcanic field in southeastern Alaska consists of 5-6 km3 (DRE) of postglacial pyroclasts that overlie Pleistocene lavas. All eleven pyroclast vents align with the long axis of the field, implying that the pyroclast magma conduits followed a crustal fissure. Most of these vents had previously erupted lavas...
The study of the undiscovered mineral resources of the Tongass National Forest and adjacent lands, Southeastern Alaska
D. A. Brew, L.J. Drew, S. D. Ludington
1992, Nonrenewable Resources (1) 303-322
The quantitative probabilistic assessment of the undiscovered mineral resources of the 17.1-million-acre Tongass National Forest (the largest in the United States) and its adjacent lands is a nonaggregated, mineral-resource-tract-oriented assessment designed for land-planning purposes. As such, it includes the renewed use of gross-in-place values (GIPV's) in dollars of the estimated...
Placer and lode platinum-group minerals in south Kalimantan, Indonesia: Evidence for derivation from Alaskan-type ultramafic intrusions
M. L. Zientek, B. Pardiarto, H. R. W. Simandjuntak, A. Wikrama, Robert L. Oscarson, A. L. Meier, R. R. Carlson
1992, Australian Journal of Earth Sciences (39) 405-417
Platinum‐group element minerals (PGM) occur in significant proportions in placer deposits in several localities in South Kalimantan. They consist of Pt‐Fe alloy that may be intergrown with or contain inclusions of Ir‐Os‐Ru alloy, laurite and chromite. Alluvial PGM found along Sungai Tambanio are in part derived from chromitite schlieren in...
Utility of radiocarbon-dated stratigraphy in determining late Holocene earthquake recurrence intervals, upper Cook Inlet region, Alaska
S. Bartsch-Winkler, H. R. Schmoll
1992, Geological Society of America Bulletin (104) 684-694
During the great 1964 earthquake, parts of coastal southern Alaska subsided tectonically as much as 2 m, and this led to burial of high-intertidal organic-rich marshes by low-intertidal and tidal silt. In the tectonically active part of upper Cook Inlet, the presence of stratigraphic sections containing numerous prehistoric interbedded layers...
Heat flow and subsurface temperature as evidence for basin-scale ground-water flow, North Slope of Alaska
D. Deming, J.H. Sass, A.H. Lachenbruch, R. F. De Rito
1992, Geological Society of America Bulletin (104) 528-542
In conjunction with the U.S. Geological Survey's exploration program in the National Petroleum Reserve, Alaska (NPRA) several high-resolution temperature logs were made in each of 21 drillholes between 1977 and 1984. These time-series of shallow (average 600-m depth) temperature profiles were extrapolated to...
Late Cretaceous inoceramid bivalves of the Kuskokwim Basin, southwestern Alaska, and their implications for basin evolution
W.P. Elder, S. E. Box
1992, Journal of Paleontology (66)
Upper Cretaceous rocks of the Kuskokwim Group are exposed in a large region of southwestern Alaska and are mainly composed of deformed turbidite deposits that contain few fossils other than inoceramid bivalves. This paper documents the taxonomy of the inoceramids in the Kuskokwim Group, develops an inoceramid...
Preliminary evidence for the involvement of budding bacteria in the origin of Alaskan placer gold
J.R. Watterson
1992, Geology (20) 315-318
Lacelike networks of micrometre-size filiform gold associated with Alaskan placer gold particles are interpreted as low-temperature pseudomorphs of a Pedomicrobium-like budding bacterium. Submicron reproductive structures (hyphae) and other morphological features similar to those of Pedomicrobiummanganicum occur as detailed three-dimensional facsimiles in high-purity gold in and on...
Changes in Alaskan soft-bottom prey communities along a gradient in sea otter predation
R.G. Kvitek, J.S. Oliver, A.R. DeGange, B.S. Anderson
1992, Ecology (73) 413-428
Sea Otter (Enhydra lutris), well documented as "keystone" predators in rocky marine communities, were found to exert a strong influence on infaunal prey communities in soft-sediment habitats. Direct and indirect effects of sea otter predation on subtidal soft-bottom prey communities were evaluated along a temporal gradient of sea otter occupancy...
Structural evolution of an arc-basin: The Gravina Belt in central southeastern Alaska
Peter J. Haeussler
1992, Tectonics (11) 1245-1265
The upper Middle Jurassic-Lower Cretaceous Gravina belt lies along the eastern margin of the Alexander terrane in southeastern Alaska. This group of turbidites and mafic to intermediate volcanic rocks was deformed during mid to Late Cretaceous time during the closing of a basin of unknown size between the Alexander terrane...
Distribution, numbers, and habitat of Bristle-thighed Curlews (Numinous tahitiensis) on Rangiroa atoll
Robert E. Gill Jr., Roland L. Redmond
1992, Notornis (39) 17-26
We assessed the numbers, distribution, and habitat of Bristle-tithed Curlews (Numinous tahitiensis) on Rangiroa Atoll, Tuamotu Archipelago, during a visit in April 1988. We estimated a total of 250-350 curlews on the atoll. These birds were seen only on the southern and western rims, where they were most common on...
Mineral resource assessment of the Annette Islands Reserve, Southeast Alaska
R. J. Horton, Susan M. Karl, Andrew Griscom, C. D. Taylor, K. R. Bond, R. Michael Senterfit
1992, Report, 1992 mineral frontiers on Indian lands
No abstract available ...
Reproductive implications of egg-size variation in Black Brant
Paul L. Flint, James S. Sedinger
1992, The Auk (109) 896-903
We analyzed variation in egg size of Black Brant (Branta bernicla nigricans) in relation to clutch size, laying date, female age, year, and position in the laying sequence. A total of 3,478 eggs was measured over three years. Egg size increased with clutch size and female age, and decreased with...
Density of loons in central Alaska
Richard B. Lanctot, Pham Xuan Quang
1992, The Condor (94) 282-286
Loons breed across North America from the high arctic south to about 43 north latitude. (AOU 1983). Populations, particularly of Common Loons (Gavia immer) have recently declined in the continental U.S. and southern Canada (Sutcliff 1979, Titus and VanDruff 1981, McIntyre 1988). As a result, state and private natural resource...
Roosting behavior of premigratory Dunlins (Calidris alpina)
Colleen M. Handel, Robert E. Gill Jr.
1992, The Auk (109) 57-72
We studied roosting behavior of Dunlins (Calidris alpina) during late summer along the coast of the Yukon-Kuskokwim Delta, Alaska, in relation to tidal cycle, time of day, time of season, and occurrence of predators. Within Angyoyaravak Bay, peak populations of 70,000-100,000 Dunlins occur each year. The major diurnal roost sites...
Intraspecific variation in egg shape among individual emperor geese
Margaret R. Petersen
1992, Journal of Field Ornithology (63) 344-354
Within-clutch variability in shape of 1743 eggs from 301 nests of Emperor Geese (Chen canagicus) laid over a 5-yr period was measured. Individual females laid similar shaped eggs in successive years, and eggs among clutches within females could not be distinguished. Cluster analysis correctly identified 69.9% of 136 known conspecific...
Breeding chronology of mottled ducks in a Texas coastal marsh
J. Barry Grand
1992, Journal of Field Ornithology (63) 195-202
The relationship between breeding chronology of Mottled Ducks (Anas fulvigula fulvigula) and wetland conditions at San Bernard National Wildlife Refuge was examined over a 3-yr period. Median nest initiation dates varied by as much as 68 d among years. Initiation occurred earlier in 1985 and 1987 versus 1986 (P <...
Suppression of guinea pig ileum induced contractility by plasma albumin of hibernators
David S. Bruce, Douglas L. Ambler, Timothy M. Henschel, Peter R. Oeltgen, Sita P. Nilekani, Steven C. Amstrup
1992, Pharmacology Biochemistry and Behavior (43) 199-203
Previous studies suggest that hibernation may be regulated by internal opioids and that the putative “hibernation induction trigger” (HIT) may itself be an opioid. This study examined the effect of plasma albumin (known to bind HIT) on induced contractility of the guinea pig ileum muscle strip. Morphine (400 nM) depressed...
Land cover mapping of the Upper Kuskokwim Resource Management Area, Alaska, using Landsat and a digital data base approach
Carl Markon
1992, Canadian Journal of Remote Sensing (18) 62-71
Digital land cover and terrain data for the Upper Kuskokwim Resource Management Area in south-central Alaska were produced by the U.S. Geological Survey for the U.S. Bureau of Land Management. These and other environmental data were incorporated into a digital data base to assist in the production of a land...
Time allocation by Greater White-fronted Geese: Influence of diet, energy reserves and predation
Craig R. Ely
1992, The Condor (94) 857-870
I determined the amount of time Greater White-fronted Geese (Anser albifrons frontalis) allocated to various activities from September to May, 1980-1982 at their primary wintering areas in the Pacific Flyway of North America. The length of time spent on roosts during the day was positively correlated to day length. Geese...
