Publications
USGS research activities relevant to Alaska have yielded more than 9400 historical publications. This page features some of the most recent newsworthy research findings.
Filter Total Items: 3087
Population genetic structure of Santa Ynez rainbow trout – 2001 based on microsatellite and mtDNA analyses Population genetic structure of Santa Ynez rainbow trout – 2001 based on microsatellite and mtDNA analyses
Microsatellite allelic and mitochondrial DNA (mtDNA) haplotype diversity are analyzed in eight rainbow trout (Oncorhynchus mykiss) collections: two from tributaries flowing into the upper Santa Ynez River watershed at Gibraltar Reservoir (Camuesa and Gidney creeks); three from tributaries between Gibraltar and Jameson reservoirs (Fox, Blue Canyon, and Alder creeks); one from a tributary...
Authors
Jennifer L. Nielsen, Christian E. Zimmerman, Jeffrey B. Olsen, Talia Wiacek, E.J. Kretschmer, Glenn M. Greenwald, John K. Wenburg
New mapping near Iron Creek, Talkeetna Mountains, indicates presence of Nikolai greenstone New mapping near Iron Creek, Talkeetna Mountains, indicates presence of Nikolai greenstone
Detailed geologic mapping in the Iron Creek area, Talkeetna Mountains B-5 Quadrangle, has documented several intrusive bodies and rock units not previously recognized and has extended the geologic history of the area through the Mesozoic and into the Tertiary era. Greenschist-facies metabasalt and metagabbro previously thought to be Paleozoic are intruded by Late Cretaceous to Paleocene...
Authors
Jeanine M. Schmidt, Melanie B. Werdon, Bruce R. Wardlaw
A genetic study to aid in restoration of murres, guillemots and murrelets to the Gulf of Alaska A genetic study to aid in restoration of murres, guillemots and murrelets to the Gulf of Alaska
Genetic data are needed to aid in restoring several species of seabirds to the Gulf of Alaska. We analyzed sequence variation in mitochondrial DNA, microsatellite DNA and nuclear introns in samples of commom murres (Uria aalge), pigeon guillemots (Cepphus columba) and marbled murrelets (Brachyramphus marmoratus) from throughout the North Pacific. Data were analyzed using traditional...
Authors
Vicki L. Friesen, John F. Piatt
Population status of Kittlitz's and Marbled Murrelets and surveys for other marine bird and mammal species in the Kenai Fjords area, Alaska Population status of Kittlitz's and Marbled Murrelets and surveys for other marine bird and mammal species in the Kenai Fjords area, Alaska
The Kittlitz's murrelet (Brachyramphus brevirostris) is a rare seabird that nests in alpine terrain and generally forages near tidewater glaciers during the breeding season. More than 95% of the global population breeds in Alaska, with the remainder occurring in the Russian Far East. A global population estimate using best-available data in the early 1990s was 20,000 individuals. However...
Authors
Thomas I. van Pelt, John F. Piatt
Alaska resource data file: Nabesna quadrangle Alaska resource data file: Nabesna quadrangle
Descriptions of the mineral occurrences shown on the accompanying figure follow. See U.S. Geological Survey (1996) for a description of the information content of each field in the records. The data presented here are maintained as part of a statewide database on mines, prospects and mineral occurrences throughout Alaska.
Authors
Travis L. Hudson
Alaska resource data file: McCarthy quadrangle Alaska resource data file: McCarthy quadrangle
Descriptions of the mineral occurrences shown on the accompanying figure follow. See U.S. Geological Survey (1996) for a description of the information content of each field in the records. The data presented here are maintained as part of a statewide database on mines, prospects and mineral occurrences throughout Alaska.
Authors
Travis L. Hudson
Alaska resource data file: Wiseman quadrangle Alaska resource data file: Wiseman quadrangle
Descriptions of the mineral occurrences shown on the accompanying figure follow. See U.S. Geological Survey (1996) for a description of the information content of each field in the records. The data presented here are maintained as part of a statewide database on mines, prospects and mineral occurrences throughout Alaska.
Authors
Joe M. Britton
40Ar/39Ar geochronology of igneous rocks in the Taylor Mountains and Dillingham quadrangles in SW Alaska 40Ar/39Ar geochronology of igneous rocks in the Taylor Mountains and Dillingham quadrangles in SW Alaska
No abstract available.
Authors
Alexander Iriondo, Michael J. Kunk, Frederic H. Wilson
Surficial geologic map of parts of the Misheguk Mountain and Baird Mountains quadrangles, Noatak National Preserve, Alaska Surficial geologic map of parts of the Misheguk Mountain and Baird Mountains quadrangles, Noatak National Preserve, Alaska
The map area, which comprises part of the Noatak National Preserve, includes approximately the southern two-thirds of the Misheguk Mountain quadrangle and the northern one-third of the Baird Mountains quadrangle. It is centered on a belt of west-trending lowlands along the Noatak River which separates the De Long Mountains to the north from the Baird Mountains to the south (Burch, 1990...
Authors
Thomas D. Hamilton
Unified Ecoregions of Alaska: 2001 Unified Ecoregions of Alaska: 2001
Unified Ecoregions of Alaska map portrays major ecosystems of the state of Alaska and neighboring portions of Canada and Russia. The word "Unified" in the title refers to the interdisciplinary, interagency, and international effort to derive this broad-scale ecosystem map. The ecoregions, as portrayed on this dataset , are large ecosystems primarily defined by climate and topography...
Authors
Gregory J. Nowacki, Page Spencer, Michael Fleming, Terry Brock, Torre Jorgenson
Geophysical identification and geological Implications of the southern Alaska magnetic trough Geophysical identification and geological Implications of the southern Alaska magnetic trough
The southern Alaska magnetic trough (SAMT) is one of the fundamental, crustal-scale, magnetic features of Alaska. It is readily recognized on 10 km upward-continued aeromagnetic maps of the state. The arcuate SAMT ranges from 30 to 100 km wide and extends in two separate segments along the southern Alaska margin for about 1200 km onshore (from near the Alaska/Canada border at about 60...
Authors
R. W. Saltus, T. L. Hudson, Frederic H. Wilson
Preliminary geologic map of the northeast Dillingham quadrangle (D-1, D-2, C-1, and C-2), Alaska Preliminary geologic map of the northeast Dillingham quadrangle (D-1, D-2, C-1, and C-2), Alaska
Open-File Report 03-105 contains a digital geologic map database for the northeast part of the Dillingham 1:250,000-scale quadrangle, specifically the D-1, D-2, C-1, and C-2 1:63,360-scale map sheets. The report includes:A Postscript file showing the geologic map on a topographic and land-grid base, and containing a Correlation of Map Units diagram (CMU), and a List of Map Units. (Note...
Authors
Frederic H. Wilson, Travis L. Hudson, Donald Grybeck, Douglas B. Stoeser, Cindi C. Preller, Damon Bickerstaff, Keith A. Labay, Marti L. Miller