DOCSLIB.ORG

Reconnaissance Geology of Amlia Island, Aleutian Islands, Alaska

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Reconnaissance Geology of Amlia Island, Aleutian Islands, Alaska Reconnaissance geology of Amlia Island, Aleutian Islands, Alaska HUGH McLEAN JAMES R. HEIN } U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 TRACY L. VALUER) 174° ABSTRACT Amlia Island, located in the central part of the Aleutian Island Atka island chain, exhibits excellent shoreline exposures of Paleogene sedimen- tary and volcanic rocks, which record the earliest observable history of the volcanic arc. Volcaniclastic sedimentary rocks deposited by debris flow, turbidite, and grain-flow processes interfinger with vol- canic flows and breccia. Pillowed flows as well as massive columnar flows ranging in composition from basalt to rhyolite record inter- fingering episodes of submarine and subaerial deposition. The occurrence of Reticulofenestra reticulata and Dictyococ- lOL cites scrippsae in laminated siltstone and sandstone beds indicates Haystack that the rocks on Amlia are late middle Eocene to early Oligocene Rock in age. Whole-rock radiometric ages of 32 and 39 m.y. from igneous rocks that interfinger with the sedimentary rocks corroborate the fossil ages and are correlative in age with the Hidden Bay pluton on 52' Adak Island. Some of the rocks on Amlia Island are only slightly altered and contain authigenic zeolite phases; other rocks are highly altered and contain prehnite, pumpellyite, and laumontite. Areal distribution of 180° 160° highly altered rocks may reflect proximity to shallow-seated plu- u.s.s tons, such as those that crop out on nearby Atka Island, which probably underlie much of Amlia. The island is structurally simple, with dips rarely exceeding 10° or 15°. High-angle faults with small displacement are common, however, and may reflect emplacement of shallow-seated intrusive rocks. Wave-cut terraces around much of the island appear to be in equilibrium with present sea level and suggest recent tectonic stability. INTRODUCTION Amlia Island is about 72 km long in an east-west direction, Amlia Island, located in the central part of the Aleutian Island about 8 km wide, and has a rugged shoreline marked by high cliffs chain, is the easternmost island of the Andreanof Island group and numerous bays. The topography of the island is characterized (Fig. 1). It lies just 2 km east of Atka Island; the two islands are by a central east-west-trending ridge with peaks ranging from 500 separated by the narrow and often turbulent waters of Amlia Pass to 600 m above sea level. Vegetation consists of a mat of tundra and (Fig. 1). grass; no trees grow on the island. Supplementary data in the form of six tables for this article may be secured free of charge by requesting Supplementary Data 83-12 from the GSA Documents Secretary. Geological Society of America Bulletin, v. 94, p. 1020-1027, 5 figs., August 1983. 1020 Downloaded from http://pubs.geoscienceworld.org/gsa/gsabulletin/article-pdf/94/8/1020/3419216/i0016-7606-94-8-1020.pdf by guest on 23 September 2021 GEOLOGY OF AMLIA ISLAND, ALASKA 1021 Amlia is an ideal place in which to map the older rocks of the contains a reconnaissance geologic map with photos of Atka and central Aleutians because there are no active volcanoes, nor any Amlia Islands. Pliocene or Pleistocene volcanic terrane. The nearest active volca- STRATIGRAPHY AND PALEONTOLOGY noes are on Atka Island, which lies to the northwest, and Seguam Island, which lies to the northeast. Prior to our work in 1979, Amlia The principal rock types on Amlia Island are volcanic sand- Island had not been mapped geologically; however, reconnaissance stone and siltstone, volcanic conglomerate, and volcanic breccia geologic studies on Atka Island in 1977 (Hein and McLean, 1980a) that interfinger with abundant pillow lavas and massive flows of indicated that the western end of Amlia consisted mainly of Ter- basalt, andesite, dacite, and rhyolite (Fig. 2). Plutonic rocks are tiary sedimentary rocks. restricted to two small gabbro plugs(?) on the north side of the In the summer of 1979, we spent nine days mapping the geol- island and a tonalite sill complex on the south side. Stratigraphic ogy of Amlia Island. The island was circumnavigated using small relations between the sedimentary sequences and the volcanic flow boats powered by outboard motors, a method that permitted close sequences are complex, and rapid changes in facies complicate inspection of sea-cliff and nearshore outcrops. Frequent landings detailed correlations. 173' Sandstone, siltstone, and massive conglomerate Volcanic rocks with massive and columnar flows Volcanic rocks with pillow flows \o Strike and dip of beds Figure 1. Index map showing location of Aleutian Islands and Amlia Island, and generalized geologic map of Amlia Island Apparent strike and dip of beds and eastern tip of Atka Island, Aleutian Islands, Alaska. Anticline Syncline Fault Triangulation station were made to collect samples for studies of lithology, chemistry, The west end of the island, from Hungry Bay to Amlia Pass and paleontology. Outcrops in the interior of the island are sparse (Fig. 1), is mainly massive volcanic sandstone and volcanic breccia because of extensive vegetative cover; however, two short traverses with minor pillow lavas and dikes. The eastern end, similarly, is into the hills around Hungry Bay permitted measurement of strati- massive beds of volcanic sandstone and tuff interbedded with vol- graphic sections of volcanic and sedimentary rock. canic flows. The central part of the island along both north and This paper describes the geology, stratigraphy, structure, age south shores is mainly volcanic flows, both pillowed and massive, relations, sandstone petrology, and alteration of Amlia Island interlayered with subordinate volcanic breccia and thin-bedded based on our reconnaissance mapping. Igneous petrology and sandstone and siltstone. Columnar flows appear to predominate chemistry are summarized herein and discussed in more detail by along the mountain ridges above elevations of 300 ip (Figs. 2 and 3). T. L. Vallier and others (unpub. data). Hein and others (1981) Several megafossils, including a fossil fish tentatively identified Downloaded from http://pubs.geoscienceworld.org/gsa/gsabulletin/article-pdf/94/8/1020/3419216/i0016-7606-94-8-1020.pdf by guest on 23 September 2021 1022 McLEAN AND OTHERS E X PL ANATION Volcanic flows, V. E. = 2.5 x nTrrTTl massive and columnar 2 3 MILES . I _L Pillowed flows "I 2.5 5 KILOMETERS Sandstone Volcanic and Figure 2. Generalized cross section of structural and stratigraph- • c • c. sedimentary breccia ie relations through the central part of Amlia Island. See Figure 1 for Fault-Arrows indicate location. direction of relative movement as a member of the Jack family Carangidae (Fig. 4A), fragments of metric ages of Amlia Island are correlative with ages reported for mollusks, and a specimen of alga1 are not age diagnostic. the Hidden Bay pluton on Adak Island (Citron and others, 1980). Calcareous, nannofossils (coccoliths), however, from seven localities contained age-diagnostic species (Table I).2 A single specimen of SEDIMENTARY ROCKS Coccolithus eopelagicus in one sample indicates a Paleogene age; the occurrence of Reticulofenestra reticulata (Gardner and Smith) The sedimentary sequence at the east and west ends of the is diagnostic for a late middle Eocene to early Oligocene age. A island is gently folded, with dips averaging about 10°. Bed forms sample from the southwest shore, located about 2.5 km north of range from massive, channelized, pebble- and cobble-bearing, very Haystock Rock, also contains R. reticulata and R. umbilica as well. coarse-grained sandstone deposited by debris flows to very thin- A sample from the northeast part of the island from a locality about bedded and laminated, fine-grained sandstone and siltstone depos- 8 km west of triangulation station Brat contains one fragment of ited by turbidity currents (Figs. 4B and 4C). Rapid stratigraphic Dictyococcites scrippsae (Bukry and Percival) that indicates a mid- changes in grain size and bed thickness are common, and inter- dle Eocene to Oligocene age. bedded pyroclastic breccia and tuff attest to pulses of volcanism Three samples analyzed for palynomorphs were found to be contemporaneous with marine sedimentation. nearly barren; however, another sample contained rare palyno- Massive sandstone beds exposed at the eastern tip of the island morphs including Picea, Pinus Haploxylon, and Triplanosporites- (Fig. 4D) resemble the inner submarine fan facies B and C of Mutti Lygodium?. and Ricci-Lucchi (1978). Turbidite sandstones usually consist of We believe that the volcanic rocks that interfinger with the Bouma Tb and Tc intervals; beds rarely contain the graded Ta inter- sedimentary rocks are coeval and equivalent in age. Two minimum val. Tracks, trails, and soft sediment deformation are common fea- K-Ar ages from slightly altered volcanic rocks are late early Oligo- tures in thin-bedded turbidite sequences. Thin-bedded and lam- cene; this age approximates the early Oligocene nannofossil ages inated sequences, whicl for the most part are composed of tuff (Table 2).3 A pyroxene andesite from a columnar flow located in a (altered to secondary minerals), probably are the result of reworked small bay 6 km west of Sviechnikof Harbor is 32.0 ± 1.0 m.y.; a pyroclastic debris or water-lain volcanic ash. rhyolite dike in a cove 2 km west of triangulation station Brat is Massive, coarse-grained, pebbly sandstone at the west end of 32.7 ± 1.0 m.y. old. A fragment of gabbroic float from the east shore the island locally contains low-angle trough cross-bedding that dips of inner Hungry Bay is 39.8 ± 1.2 m.y., which corresponds to a late to the west and may indicate grain flow produced by tidal currents. middle Eocene age (Lowrie and Alvarez, 1981). The 32-m.y. radio- Imbricated clasts in debris flows near Hungry Bay show southwest- erly flow. 'A specimen of alga(?) having a radial form, about 10 cm in diameter, Sandstone Petrography that resembles the so-called Annularia stellata on Adak Island was found in beds of laminated silty sandstone along the east shore of Hungry Bay.
Load more

Recommended publications
  • Resource Utilization in Atka, Aleutian Islands, Alaska
    RESOURCEUTILIZATION IN ATKA, ALEUTIAN ISLANDS, ALASKA Douglas W. Veltre, Ph.D. and Mary J. Veltre, B.A. Technical Paper Number 88 Prepared for State of Alaska Department of Fish and Game Division of Subsistence Contract 83-0496 December 1983 ACKNOWLEDGMENTS To the people of Atka, who have shared so much with us over the years, go our sincere thanks for making this report possible. A number of individuals gave generously of their time and knowledge, and the Atx^am Corporation and the Atka Village Council, who assisted us in many ways, deserve particular appreciation. Mr. Moses Dirks, an Aleut language specialist from Atka, kindly helped us with Atkan Aleut terminology and place names, and these contributions are noted throughout this report. Finally, thanks go to Dr. Linda Ellanna, Deputy Director of the Division of Subsistence, for her support for this project, and to her and other individuals who offered valuable comments on an earlier draft of this report. ii TABLE OF CONTENTS ACKNOWLEDGMENTS . e . a . ii Chapter 1 INTRODUCTION . e . 1 Purpose ........................ Research objectives .................. Research methods Discussion of rese~r~h*m~t~odoio~y .................... Organization of the report .............. 2 THE NATURAL SETTING . 10 Introduction ........... 10 Location, geog;aih;,' &d*&oio&’ ........... 10 Climate ........................ 16 Flora ......................... 22 Terrestrial fauna ................... 22 Marine fauna ..................... 23 Birds ......................... 31 Conclusions ...................... 32 3 LITERATURE REVIEW AND HISTORY OF RESEARCH ON ATKA . e . 37 Introduction ..................... 37 Netsvetov .............. ......... 37 Jochelson and HrdliEka ................ 38 Bank ....................... 39 Bergslind . 40 Veltre and'Vll;r;! .................................... 41 Taniisif. ....................... 41 Bilingual materials .................. 41 Conclusions ...................... 42 iii 4 OVERVIEW OF ALEUT RESOURCE UTILIZATION . 43 Introduction ............
    [Show full text]
  • Amlia Sill Ocean Or Sea: Bering Sea
    INTERNATIONAL HYDROGRAPHIC INTERGOVERNMENTAL OCEANOGRAPHIC ORGANIZATION COMMISSION (of UNESCO) UNDERSEA FEATURE NAME PROPOSAL (See IHO-IOC Publication B-6 and NOTE overleaf) Note: The boxes will expand as you fill the form. Name Proposed: Amlia Sill Ocean or Sea: Bering Sea Geometry that best defines the feature (Yes/No) : Point Line Polygon Multiple points Multiple lines* Multiple Combination of polygons* geometries* Yes Yes No No No No Yes * Geometry should be clearly distinguished when providing the coordinates below. Lat. (e.g. 63°32.6’N) Long. (e.g. 046°21.3’W) Point (173 m) 52° 31.8’N Point (173 m) 173° 26.5’W Line Start (183 m) 52° 28.1’N Line Start (183 m) 173° 35.5’W Line Mid1 (173 m) 52° 31.8’N Line Mid1 (173 m) 173° 26.5’W Coordinates: Line Mid2 (203 m) 52° 34.6’N Line Mid2 (203 m) 173° 14.9’W Line Mid3 (383 m) 52° 35.3’N Line Mid3 (383 m) 173° 10.3’W Line Mid4 (483 m) 52° 36.2’N Line Mid4 (483 m) 172° 54.5’W Line End (185 m) 52° 36.7’N Line End (185 m) 172° 41.3’W Maximum Depth: 1050 m Steepness : 1.1° Feature Minimum Depth : 173 m Shape : elliptical Description: Total Relief : 877 m Dimension/Size : 70000 m long/ ~6000 m wide Associated Features: Umnak canyons, Amlia Canyon Shown Named on Map/Chart: Chart/Map References: Shown Unnamed on Map/Chart: US Nav. Chart 16480 Within Area of Map/Chart: Reason for Choice of Name (if a Amlia Sill partially separates Amlia Basin from the Aleutian Basin.
    [Show full text]
  • THE ALEUTIAN ISLANDS: THEIR PEOPLE and NATURAL HISTORY
    SMITHSONIAN INSTITUTION WAR BACKGROUND STUDIES NUMBER TWENTY-ONE THE ALEUTIAN ISLANDS: THEIR PEOPLE and NATURAL HISTORY (With Keys for the Identification of the Birds and Plants) By HENRY B. COLLINS, JR. AUSTIN H. CLARK EGBERT H. WALKER (Publication 3775) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION FEBRUARY 5, 1945 BALTIMORE, MB., U„ 8. A. CONTENTS Page The Islands and Their People, by Henry B. Collins, Jr 1 Introduction 1 Description 3 Geology 6 Discovery and early history 7 Ethnic relationships of the Aleuts 17 The Aleutian land-bridge theory 19 Ethnology 20 Animal Life of the Aleutian Islands, by Austin H. Clark 31 General considerations 31 Birds 32 Mammals 48 Fishes 54 Sea invertebrates 58 Land invertebrates 60 Plants of the Aleutian Islands, by Egbert H. Walker 63 Introduction 63 Principal plant associations 64 Plants of special interest or usefulness 68 The marine algae or seaweeds 70 Bibliography 72 Appendix A. List of mammals 75 B. List of birds 77 C. Keys to the birds 81 D. Systematic list of plants 96 E. Keys to the more common plants 110 ILLUSTRATIONS PLATES Page 1. Kiska Volcano 1 2. Upper, Aerial view of Unimak Island 4 Lower, Aerial view of Akun Head, Akun Island, Krenitzin group 4 3. Upper, U. S. Navy submarine docking at Dutch Harbor 4 Lower, Village of Unalaska 4 4. Upper, Aerial view of Cathedral Rocks, Unalaska Island 4 Lower, Naval air transport plane photographed against peaks of the Islands of Four Mountains 4 5. Upper, Mountain peaks of Kagamil and Uliaga Islands, Four Mountains group 4 Lower, Mount Cleveland, Chuginadak Island, Four Mountains group ..
    [Show full text]
  • Aleutian Islands and Atka-Amlia Islands Management Areas Salmon Annual Management Report, 2014
    Fishery Management Report No. 15-02 Aleutian Islands and Atka-Amlia Islands Management Areas Salmon Annual Management Report, 2014 by Dawn M. Wilburn and Matthew D. Keyse January 2015 Alaska Department of Fish and Game Divisions of Sport Fish and Commercial Fisheries Symbols and Abbreviations The following symbols and abbreviations, and others approved for the Système International d'Unités (SI), are used without definition in the following reports by the Divisions of Sport Fish and of Commercial Fisheries: Fishery Manuscripts, Fishery Data Series Reports, Fishery Management Reports, and Special Publications. All others, including deviations from definitions listed below, are noted in the text at first mention, as well as in the titles or footnotes of tables, and in figure or figure captions. Weights and measures (metric) General Mathematics, statistics centimeter cm Alaska Administrative all standard mathematical deciliter dL Code AAC signs, symbols and gram g all commonly accepted abbreviations hectare ha abbreviations e.g., Mr., Mrs., alternate hypothesis HA kilogram kg AM, PM, etc. base of natural logarithm e kilometer km all commonly accepted catch per unit effort CPUE liter L professional titles e.g., Dr., Ph.D., coefficient of variation CV meter m R.N., etc. common test statistics (F, t, χ2, etc.) milliliter mL at @ confidence interval CI millimeter mm compass directions: correlation coefficient east E (multiple) R Weights and measures (English) north N correlation coefficient cubic feet per second ft3/s south S (simple) r foot ft west W covariance cov gallon gal copyright degree (angular ) ° inch in corporate suffixes: degrees of freedom df mile mi Company Co.
    [Show full text]
  • ALEUTIAN ISLANDS and ATKA-AMLIA ISLANDS AREAS SALMON MANAGEMENT PLAN, 2003 by Arnold R. Shaul and Joseph J. Dinnocenzo Regional
    ALEUTIAN ISLANDS AND ATKA-AMLIA ISLANDS AREAS SALMON MANAGEMENT PLAN, 2003 By Arnold R. Shaul and Joseph J. Dinnocenzo Regional Information Report1 No. 4K03-17 Alaska Department of Fish and Game Division of Commercial Fisheries 211 Mission Road Kodiak, Alaska 99615 April 2003 1The Regional Information Report Series was established in 1987 to provide an information access system for all unpublished division reports. These reports frequently serve diverse ad hoc informational purposes or archive basic uninterpreted data. To accommodate timely reporting of recently collected information, reports in this series undergo only limited internal review and may contain preliminary data; this information may be subsequently finalized and published in the formal literature. Consequently, these reports should not be cited without prior approval of the author or the Division of Commercial Fisheries. TABLE OF CONTENTS Page LIST OF FIGURES .................................................................................................................. i ABSTRACT.............................................................................................................................. 1 ALEUTIAN ISLANDS AREA.................................................................................................. 2 ATKA-AMLIA AREA.............................................................................................................. 3 GPS COORDINATES AND ENFORCEMENT...................................................................... 4 FIGURES.................................................................................................................................
    [Show full text]
  • Alaska Maritime National Wildlife Refuge (AMNWR) Would Not Be Indicative of Weather Patterns for the Entire Complex
    ANN UAL I~ARRATI VE REPORT Calendar Year 1982 ALAS KA MARITIME NATIONAL WILDLIF E REFUGE Homer, Alas ka ALEUTIAN ISLANDS UNIT Adak, Alaska ALAS!\.P_ l'tA.RITIME NATIONAL WILDLIFE REFUGE Homer, Alaska ANNUAL NARRATIVE REPORT Calendar Year 1982 library U.S. Fish & Wildlife Service 1011 E. Tudor Road Anchorage, Alaska 99503_ U.S. Department of the Interior Fish and Wildlife Service NATIONAL WILDLIFE REFUGE SYSTEM Refuge Manager John L. Martin Assistant Refuge Manager Tom J. Early Refuge Biologist Edgar P . Bailey - •• I-: f ~ :!-!anager. GS - 13 . EOD 12-21-81, PFT J• Eo~ar P. ba~. Refuge Biologist. GS-ll , EOD 10- 01-81, PFT Review and Approvals 1 TABLE OF CONTENTS Page A. HIGHLIGHTS 4 B. CLIMATIC CONDITIONS 5 C. LAND ACQUISITION 1. Fee Title. .Nothing to Report 2. Easement •• .Nothing to Report 3. Other ••••• • ••••••••••••••••••••••••••••••••••••• 5 D. PLANNING l. Master Plan ............••...............•.........•.•............. 9 2. Management Plan . •••••••••...•••••..•.••.••••...•••.•.••.....•..• 9 3. Public Participation •••••••••••••••••••••••••••• Nothing to Report 4. Compliance with Environmental Mandates •••••••••• Nothing to Report s. Research and Investigations ••••••••••••.•••••••••••••••••••••••• 9 J E. ADMINISTRATION 1. Personnel •••••••••••••••••••••••••••••••••••••••••••••••••••••• l2 2. Youth Programs •••••••••••••••••••••••••••••••••• Nothing to Report 3. Other Manpower Programs ••••••••••••••••••••••••• Nothing to Re·port 4. Volunteers Program •••••••••••••••••••••••••••••• Nothing to Report s. Funding . ..........•.•.••...••...........•••....•...•.•......••.
    [Show full text]
  • Sea Otter Distribution and Abundance in Alaska 2/7/73
    •• .. 2/7/73 SEA OTTER DISTRIBUTION AND ABlli'IDA.'lCE IN ALASKA by Karl Schneider Alaska Department of Fish and Game The following description of sea otter distribution and abundance is based on a variety of surveys and other information available as of January 5, 1973. Most population estimates of sea otters have been based on-aerial surveys made from fixed-wing aircraft. Kenyon (The sea otter in the eastern Pacific Ocean, 1969) made estimates based on the assumption that he saw 50 to 75 percent of the sea otters from the air. He used these estimates to provide a comparative picture of the status of sea otter populations throughout Alaska but recognized that the actual numbers might be low. Lensink (J. Ma..mmalogy 41(2):172-182, 1960) made an estimate of the population of P.mchitka Island, based on counts from shore, that were three to four times Kenyon's estimate based on aerial surveys. A recent series of comparative surveys and information gathered during harvests demonstrate that estimates based on aerial surveys are extremely low. Many of the following estimates of tsea otter abundance are based on aerial counts expanded to the level of shore counts with information collected by comparing survey technique. Because all of the sea otters are not seen even on shore counts, some of the following estimates may be somewhat low. The present estimate of sea ~tter in Alaska totals approximately 100,000 to 125,000. Near Islands Sea otters were completely exterminated in the Near Islands. In the late 1950's a few individuals appeared throughout the island group.
    [Show full text]
  • New Paleomagnetic Data from the Central Aleutian Arc: Evidence and Implications for Block Rotations
    New Paleomagnetic Data From the Central Aleutian Arc: Evidence and Implications for Block Rotations Lena Krutikov Department of Geology and Geophysics, University of Alaska, Fairbanks, Alaska, USA David B. Stone Geophysical Institute, University of Alaska, Fairbanks, Alaska, USA Pavel Minyuk Northeast Interdisciplinary Research Institute, Magadan, Russia Early paleomagnetic measurements (late 1960s and early 1970s) from the central Aleutian Island Arc produced both scattered and internally consistent results based solely on alternating field demagnetization. Archived core samples collected from Amchitka and Adak islands for these previous paleomagnetic studies were reanalyzed for this study using modern thermal demagnetization techniques. The new measurements from Amchitka Island indicate significant clockwise rotation (R = 54.7 ± 8.0°) between 14 Ma and the present. Adak Island showed no rotation for volcanic rocks of Quaternary age associated with the present volcanic arc, which is consistent with the lack of rotation seen in other young volcanic rocks (<2 Ma) sampled at localities from Unalaska Island in the east to Kanaga Island in the west. The Eocene Andrew Lake Formation shows a clear magnetic overprint that completely masks any information about possible rotations. Other published studies show rotations similar to those seen for Amchitka Island on Umnak, Amlia, Bering, and Medny islands. Models predicting clockwise rotations involve breaking the forearc into discrete blocks and slivers that rotate and/or travel westward along the curve of the arc in response to the arc-parallel component of the Pacific Plate motion. These models have difficulty explaining the large rotations seen in the easternmost islands sampled, where the relative motion of the Pacific Plate is more or less perpendicular to the arc.
    [Show full text]
  • Atka/Amlia Islands Management Area Pink Salmon Fishery Annual Report
    ATKNAMLIA ISLANDS MANAGEMENT AREA PINK SALMON FISHERY ANNUAL REPORT, 1992 Patrick Holmes and Rod Campbell Regional Information ~e~ort'No. 4K93-26 Alaska Department of Fish and Game Division of Commercial Fisheries 2 1 1 Mission Road Kodiak, Alaska 99615-6399 September 1993 lThe Regional Information Report Series was established in 1987 to provide an information access system for all unpublished division reports. These reports frequently serve diverse ad hoc informational purposes or archive basic uninterpreted data To accommodate timely reporting of recently collected information, reports in this series undergo only limited internal review and may contain prelirmnary data; this information may be subsequently finalized and published in the formal literature. Consequently, these reports should not be cited without prior approval of the author or the Division of Commercial Fisheries. AUTHOR Pamck B. Holmes is an Assistant Regional Finfish Management Biologist for Region IV, Alaska Department of Fish and Game, Division of Commercial Fisheries, 21 1 Mission Road, Kodiak, Alaska 99615. Rod Campbell is the Assistant Salmon Area Management Biologist for the Southeastern District of the Alaska Peninsula, and the Assistant Area Hening Biologist for the Alaska Peninsula and Aleutian Islands Management Areas, Region IV, 211 Mission Road, Kodiak, Alaska 99615. ACKNOWLEDGEMENTS The authors express their thanks to: Arnold Shaul, Management Biologist for the Alaska Peninsula and Aleutian Islands; seasonal employees: Moses Dirks, Ronald Snigaroff; technical support st. Lucinda Neel, Sharron Theis, and Joanne Shaker. Particularly appreciated was the support of the residents of Atka, the Atka Fishermen's Association, the Atka City Staff, ATAXM Native Corporation, and the Atka IRA Council.
    [Show full text]
  • Alaska Resources Library & Information Servu:Ies Anchorage
    ,_ SUI'H·1ARY OF BIRD OBSERVATIONS MADE IN THE ANDREANOF, RAT, AND NEAR ISLANDS 13 July - 22 July 1987 Compiled by: Daniel K. Niven, SCA Volunteer, Aleutian Islands Unit, Alaska Maritime National Wildlife Refuge, U.S. Fish and Wildlife Service, Adak, AK ~:,, Greg T. McClellan, Biological Technician, Aleutian I Islands Unit, Alaska Maritime National Wildlife Refuge, U.S. Fish and Wildlife Service, Adak, AK Date: August 1987 Aleutian Islands, Andreanof Islands, Rat Islands, Near Islands, Adak, Kanaga, Tanaga, Amchitka, Kiska, Buldir, Asattu, birds, seabirds ARLIS ' Alaska Resources 0 Library & Information SerVices 0 0 .AnchoraQ"f'. Alnsk~-1 1..0 1..0 I'­ M M ARLIS Alaska Resources Library & Information Servu:ies Anchorage, Alaska ·;\ ,J ---·--------I 11 t ~'od uc: t: ion.. This ~'epot't SUfTlnlC:Wi zes fie J. d obse~'vat i ems of b i ~~ds made -b)L_:i~"!?J K. NivEm, Gt~eg t. l"lcClellan, Evan Klett, and othet~ membet~s.,.,o,f'f~!j,_!?ld crew in the Andreanof, Rat, and Near Islands of the Aleutian~ f~om 13 July·to 22 July 1987. Both pelagic and land based bird observations are included. The bulk of the pelagic cibservations compiled here were gathered while conducting a series of 32 9uantified pelagic censuses to doc0men~ the dist~ibution, abundance, and biomass of seabirds along the Aleutian Island chain. Land based observations were primarily made while conducting beach surveys along established t~outes on Kiske., and as incidental obset~vations m.::1de while L"<2_nc.iucting more intensive fieldwork aimed at determining the status of Aleutian Canada g~ese on Agatt~ and while searching for fox sign on Kiska.
    [Show full text]
  • Smooth Sheet Bathymetry of the Aleutian Islands
    NOAA Technical Memorandum NMFS-AFSC-250 Smooth Sheet Bathymetry of the Aleutian Islands by M. Zimmermann, M. M. Prescott, and C. N. Rooper U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Marine Fisheries Service Alaska Fisheries Science Center May 2013 NOAA Technical Memorandum NMFS The National Marine Fisheries Service's Alaska Fisheries Science Center uses the NOAA Technical Memorandum series to issue informal scientific and technical publications when complete formal review and editorial processing are not appropriate or feasible. Documents within this series reflect sound professional work and may be referenced in the formal scientific and technical literature. The NMFS-AFSC Technical Memorandum series of the Alaska Fisheries Science Center continues the NMFS-F/NWC series established in 1970 by the Northwest Fisheries Center. The NMFS-NWFSC series is currently used by the Northwest Fisheries Science Center. This document should be cited as follows: Zimmermann, M., M. M. Prescott, and C. N. Rooper. 2013. Smooth sheet bathymetry of the Aleutian Islands. U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-250, 43 p. Reference in this document to trade names does not imply endorsement by the National Marine Fisheries Service, NOAA. NOAA Technical Memorandum NMFS-AFSC-250 Smooth Sheet Bathymetry of the Aleutian Islands by M. Zimmermann, M. M. Prescott, and C. N. Rooper Alaska Fisheries Science Center 7600 Sand Point Way NE Seattle WA 98115 www.afsc.noaa.gov U.S. DEPARTMENT OF COMMERCE Rebecca M. Blank, Acting Secretary National Oceanic and Atmospheric Administration Kathryn D. Sullivan, Acting Under Secretary and Administrator National Marine Fisheries Service Samuel D.
    [Show full text]
  • Aleutian Islands
    324 ¢ U.S. Coast Pilot 9, Chapter 7 Chapter 9, Pilot Coast U.S. 180°W 176°W 172°W 168°W 164°W Chart Coverage in Coast Pilot 9—Chapter 7 NOAA’s Online Interactive Chart Catalog has complete chart coverage http://www.charts.noaa.gov/InteractiveCatalog/nrnc.shtml 16011 172°W 176°W 58°N St. Paul Island BERING SEA St. George Island 56°N Unimak Island 16528 16518 16531 16500 16517 54°N S 16515 16433 16435 D L A N 16511 A L E U T I A N I S 16522 16501 16520 Attu Island A 16421 16436 16480 M 16521 16430 U K 16514 T 16487 16490 A 16513 16463 Agattu Island P 16431 A S 16471 S S S 16441 A P 52°N 16432 A 16434 K 16423 Kiska Island T Adak Island I 16465 16486 16420 16442 16450 H C 16467 M A 16462 16440 16460 50°N 16012 26 SEP2021 NORTH PA CIFIC OCEAN 26 SEP 2021 U.S. Coast Pilot 9, Chapter 7 ¢ 325 Aleutian Islands (1) This chapter describes the Aleutian Islands and the 26 51°11.83'N., 179°50.46'W. 31 51°37.86'N., 171°34.53'W. many passes leading from the Pacific Ocean into the 27 52°39.35'N., 178°39.78'W. 32 51°15.27'N., 172°36.40'W. Bering Sea. Also described are the harbors of Dutch 28 53°13.18'N., 173°49.18'W. 33 50°21.63'N., 179°24.20'W. Harbor on Unalaska Island; Kuluk Bay on Adak Island; Massacre Bay on Attu Island; and many other smaller 29 53°02.71'N., 172°51.16'W.
    [Show full text]