Preliminary integrated geologic map databases for the United States: Digital data for the reconnaissance geologic map of the western Aleutian Islands, Alaska

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Frederic H. Wilson

Originator: Solmaz Mohadjer

Originator: Keith A. Labay

Originator: Nora Shew

Publication_Date: 2006

Title:

Preliminary integrated geologic map databases for the United States: Digital data for the reconnaissance geologic map of the western Aleutian Islands, Alaska

Edition: ver. 1.0

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: U.S. Geological Survey Open-File Report

Issue_Identification: OFR 2006-1302

Online_Linkage: <http://pubs/usgs.gov/of/2006/1302/>

Larger_Work_Citation:

Citation_Information:

Originator: Wilson, F.H.

Originator: Mohadjer, Solmaz

Originator: Grey, D.M.

Publication_Date: Unknown

Title:

Reconnaissance geologic map of the western Aleutian Islands, Alaska

Geospatial_Data_Presentation_Form: map

Series_Information:

Series_Name: U.S. Geological Survey Scientific Investigations Map

Issue_Identification: SIM-???

Description:

Abstract:

This data set represents a reconnaissance geologic map of the western Aleutian Islands, from Great Sitkin and Umak Islands to Attu Island, spanning approximately 500km. This compilation was built from geologic mapping over the past 50 years and presented in a variety of scales. This data set is presented for use at a nominal scale of 1:500,000, although individual datasets herein may contain data for use at a larger scale.

This data set is a portion of a statewide geology database, which is being compiled by the U.S. Geological Survey's National Surveys and Analysis (NSA) project, whose goal is to compile geologic, geochemical, geophysical, and other data.

Purpose:

This data set represents part of a systematic effort to release geologic map data fro the United States in a uniform manner. Geologic data in this series has been compiled from a wide variety of sources, published and unpublished, ranging from state and regional geologic maps to large-scale field mapping.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2006

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: 172.0

East_Bounding_Coordinate: -176.0

North_Bounding_Coordinate: 53.25

South_Bounding_Coordinate: 51.25

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: geology

Theme_Keyword: bedrock

Theme_Keyword: volcano

Place:

Place_Keyword_Thesaurus: Geographic names information system (GNIS)

Place_Keyword: Attu

Place_Keyword: Kiska

Place_Keyword: Rat Island

Place_Keyword: Gareloi Island

Place_Keyword: Adak

Place_Keyword: Amchitka Island

Place_Keyword: Great Sitkin Island

Place_Keyword: Umak Island

Place_Keyword: Buldir Island

Place_Keyword: Bering Sea

Access_Constraints: None

Use_Constraints:

None. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: Frederic H. Wilson

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing and physical address

Address: 4200 University Drive

City: Anchorage

State_or_Province: Alaska

Postal_Code: 99508-4667

Country: U.S.A.

Contact_Voice_Telephone: 907-786-7448

Contact_Electronic_Mail_Address: fwilson@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name:

Browse_Graphic_File_Description:

Browse_Graphic_File_Type:

Data_Set_Credit:

This data set was prepared by Frederic H. Wilson (USGS), Solmaz Mohadjer (contractor), Keith A. Labay (contractor), and Nora Shew (USGS)

Native_Data_Set_Environment:

Data set was created using ESRI ARC/Info version 7.2.1 on a Unix platform

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

There were many types of source materials used to compile this data set. Sources include previously published maps on folded paper and unpublished digital maps. The dates of the mapping range from the 1950's to as recent as 2005. Vector features were mostly digitized on a large digitizing tablet. Vector and polygon attributes were assigned based on the original source. The digital data has been checked, and the geologic map has been technically reviewed and edited.

Logical_Consistency_Report:

Each geology coverage is a network coverage containing attributed arcs and polygons. Each polygon has a coded attribute designating the mapped geologic unit. Faults, stratigraphic contacts, and other linear features are represented as arcs. When a fault is also a stratigraphic contact, only a single arc is present. Dangling arcs may be present (faults, dike, etc.)

This data set has been compiled from a variety of sources, ranging from state and regional geologic maps to large-scale field mapping. Locally, maps from differing sources were incompatible at their boundaries, resulting in some unit boundaries shown as straight lines, reflecting the boundary of the source map.

Completeness_Report:

The complete data set consists of 5 geology coverages. There is also an associated relational database of geologic units. Each coverage has the extent of a 1:250,000 scale quadrangle, except for Kiska quadrangle, which is extended to include Buldir Island. A graphic representation of the database and a report with complete geologic unit descriptions is provided in .pdf format.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

This data is presented for use at a nominal scale of 1:500,000, although some data is suitable for use at a larger scale.

Lineage:

Process_Step:

Process_Description:

Linework for the geology compilation was either hand digitized on a large digitizing tablet or from a scanned image from material of various media and scale. The arcs and polygons were attributed. The spatial databases are provided in UTM projection and geographic coordinates. The native ARC/Info coverages have been exported to an interchange file format, .e00, and also converted to ArcView shape files.

Process_Date: 2006

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: Frederic H. Wilson

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing and physical

Address: 4200 University Drive

City: Anchorage

State_or_Province: Alaska

Postal_Code: 99508-4667

Country: U.S.A.

Contact_Voice_Telephone: 907-786-7448

Contact_Electronic_Mail_Address: fwilson@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 59

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: 171.0

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000

False_Northing: 0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000256

Ordinate_Resolution: 0.00256

Planar_Distance_Units: meters

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 60

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: 177.0

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000

False_Northing: 0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000256

Ordinate_Resolution: 0.000256

Planar_Distance_Units: meters

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 1

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: -177.0

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000

False_Northing: 0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000256

Ordinate_Resolution: 0.000256

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1927

Ellipsoid_Name: Clarke 1866

Semi-major_Axis: 6378206.4

Denominator_of_Flattening_Ratio: 294.9787

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: polygons

Entity_Type_Definition:

Characteristics of the polygon features in the geology coverages are coded in the polygon attribute table. The table <cov>.pat includes the following items: CLASS, NSACLASS, NSAMOD, QCLASS (not used), SOURCE, LABEL, MIN_AGE, and MAX_AGE.

Entity_Type_Definition_Source: This data set

Attribute:

Attribute_Label: NSACLASS

Attribute_Definition:

NSACLASS is a positive integer value (4 5 B) item in the polygon attribute table. Values range discontinuously from 0 to 1153. NSACLASS is a numeric code for the geologic unit. This data set represents a generalized map, this it is possible that a geologic unit is made of multiple NSACLASS values. Each NSACLASS matches with geologic unit labels in LABEL and has a minimum (MIN_AGE) and maximum (MAX_AGE) range, given in million of years (my).

Supplemental attribute tables included with this data set, contain descriptive information of each geologic unit. A user may use items SOURCE and CLASS to retrieve information about the original units from which these generalized units were formed.

NOTE: Because of the limitations of common GIS fonts, the letters "Mz" are substituted for the standard symbol for "Mesozoic."

Attribute_Definition_Source: This data set.

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 98

Enumerated_Domain_Value_Definition: not mapped

Enumerated_Domain:

Enumerated_Domain_Value: 99

Enumerated_Domain_Value_Definition: bedrock unknown

Enumerated_Domain:

Enumerated_Domain_Value: 100

Enumerated_Domain_Value_Definition: Qs - Surficial deposits, undivided (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 101

Enumerated_Domain_Value_Definition: ice

Enumerated_Domain:

Enumerated_Domain_Value: 102

Enumerated_Domain_Value_Definition: water

Enumerated_Domain:

Enumerated_Domain_Value: 105

Enumerated_Domain_Value_Definition: Qa - Alluvium (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 106

Enumerated_Domain_Value_Definition: Qf - Alluvial fan deposits (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 107

Enumerated_Domain_Value_Definition: Qc - Colluvial deposits (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 108

Enumerated_Domain_Value_Definition: Qls - Landslide and mudflow deposits (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 110

Enumerated_Domain_Value_Definition: Qa - Alluvium (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 112

Enumerated_Domain_Value_Definition: Qa - Alluvium (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 113

Enumerated_Domain_Value_Definition: Qsw - Swamp deposits (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 115

Enumerated_Domain_Value_Definition: Qb - Beach deposits (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 116

Enumerated_Domain_Value_Definition: Qs - Surficial deposits, undivided (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 120

Enumerated_Domain_Value_Definition: Qd - Eolian deposits (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 125

Enumerated_Domain_Value_Definition: Qg - Glacial deposits, undivided (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 170

Enumerated_Domain_Value_Definition: Qa - Alluvium (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 282

Enumerated_Domain_Value_Definition: QTs - Older silt, sand, and gravel (Quaternary or Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 284

Enumerated_Domain_Value_Definition: QTs - Older silt, sand, and gravel (Quaternary or Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 290

Enumerated_Domain_Value_Definition: QTf - Faneto Formation (early Pleistocene or late Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 295

Enumerated_Domain_Value_Definition: Qhdd - Anthropogenic deposits (Holocene)

Enumerated_Domain:

Enumerated_Domain_Value: 300

Enumerated_Domain_Value_Definition: Qvu - Volcanic rocks and deposits, undivided (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 305

Enumerated_Domain_Value_Definition: Qv - Younger volcanic rocks (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 306

Enumerated_Domain_Value_Definition: Qba - Basalt and andesite domes (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 310

Enumerated_Domain_Value_Definition: Qp - Pyroclastic rocks (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 311

Enumerated_Domain_Value_Definition: Qat - Ash and tephra deposits (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 313

Enumerated_Domain_Value_Definition: Ql - Lahar and debris avalanche deposits (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 314

Enumerated_Domain_Value_Definition: Ql - Lahar and debris avalanche deposits (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 317

Enumerated_Domain_Value_Definition: Qsp - Sitkin Point Formation and similar rocks (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 320

Enumerated_Domain_Value_Definition: Qvd - Vent volcanic rocks and deposits (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 330

Enumerated_Domain_Value_Definition: Qvd - Vent volcanic rocks and deposits (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 335

Enumerated_Domain_Value_Definition: Qep - East Point Formation (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 336

Enumerated_Domain_Value_Definition:

Qdd - Little Sitkin Dacite and Double Point Dacite, undivided (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 350

Enumerated_Domain_Value_Definition:

QTv - Basalt plugs and associated breccia (Quaternary and Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 355

Enumerated_Domain_Value_Definition: Qvu - Volcanic rocks and deposits, undivided (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 402

Enumerated_Domain_Value_Definition: Qvu - Volcanic rocks and deposits, undivided (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 404

Enumerated_Domain_Value_Definition: Qvu - Volcanic rocks and deposits, undivided (Quaternary)

Enumerated_Domain:

Enumerated_Domain_Value: 450

Enumerated_Domain_Value_Definition:

QTv - Older volcanic rocks, undivided (Quaternary and Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 451

Enumerated_Domain_Value_Definition:

QTv - Older volcanic rocks, undivided (Quaternary and Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 454

Enumerated_Domain_Value_Definition: QTob - Olivine basalt flows (Quaternary and Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 460

Enumerated_Domain_Value_Definition:

QTv - Older volcanic rocks, undivided (Quaternary and Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 462

Enumerated_Domain_Value_Definition: QTqk - Quartz-keratophyre dikes (Quaternary and Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 463

Enumerated_Domain_Value_Definition:

QTha - Hornblende andesite and dacite (Quaternary and Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 466

Enumerated_Domain_Value_Definition:

QTv - Older volcanic rocks, undivided (Quaternary and Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 470

Enumerated_Domain_Value_Definition:

QTv - Older volcanic rocks, undivided (Quaternary and Tertiary

Enumerated_Domain:

Enumerated_Domain_Value: 475

Enumerated_Domain_Value_Definition: QTkh - Kiska Harbor Formation (Quaternary? and late Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 476

Enumerated_Domain_Value_Definition:

QTkb - Kiska Harbor Formation, breccia member (Quaternary? and late Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 477

Enumerated_Domain_Value_Definition:

QTkf - Kiska Harbor Formation, flow member (Quaternary? and late Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 572

Enumerated_Domain_Value_Definition: Tch - Chuniksak Formation and similar rocks (Miocene)

Enumerated_Domain:

Enumerated_Domain_Value: 610

Enumerated_Domain_Value_Definition: Tc - Chirikof Formation (Miocene?)

Enumerated_Domain:

Enumerated_Domain_Value: 650

Enumerated_Domain_Value_Definition:

Tn - Nevidiskov Formation (early Miocene? or late Oligocene?)

Enumerated_Domain:

Enumerated_Domain_Value: 750

Enumerated_Domain_Value_Definition: Tgc - Gunners Cove Formation (Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 751

Enumerated_Domain_Value_Definition: Tbp - Banjo Point Formation (Oligocene or late Eocene)

Enumerated_Domain:

Enumerated_Domain_Value: 800

Enumerated_Domain_Value_Definition: Tal - Andrew Lake Formation and similar rocks (late Eocene)

Enumerated_Domain:

Enumerated_Domain_Value: 1010

Enumerated_Domain_Value_Definition: Tid - Dikes and hypabysssal intrusive rocks (Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 1011

Enumerated_Domain_Value_Definition: Tid - Dikes and hypabyssal intrusive rocks (Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 1012

Enumerated_Domain_Value_Definition: Tid - Dikes and hypabyssal intrusive rocks (Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 1050

Enumerated_Domain_Value_Definition: Tcp - Chitka Point Formation (Miocene)

Enumerated_Domain:

Enumerated_Domain_Value: 1051

Enumerated_Domain_Value_Definition: Tid - Dikes and hypabyssal intrusive rocks (Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 1066

Enumerated_Domain_Value_Definition:

Tlp - Lavas and pyroclastic deposits, undifferentiated (Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 1080

Enumerated_Domain_Value_Definition: Tvb - Vega Bay Formation (Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 1081

Enumerated_Domain_Value_Definition: Tvo - Finger Bay Volcanics and similar rocks (Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 1094

Enumerated_Domain_Value_Definition:

TMzkv - Krugloi Formation, tuff and lava (early Tertiary or late Mesozoic?)

Enumerated_Domain:

Enumerated_Domain_Value: 1095

Enumerated_Domain_Value_Definition:

TMzkv - Krugloi Formation, tuff and lava (early Tertiary or late Mesozoic?)

Enumerated_Domain:

Enumerated_Domain_Value: 1096

Enumerated_Domain_Value_Definition: TMzbv - Volcanic rocks (early Tertiary or late Mesozoic?)

Enumerated_Domain:

Enumerated_Domain_Value: 1203

Enumerated_Domain_Value_Definition: Tagr - Albite granite (Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 1207

Enumerated_Domain_Value_Definition: Td - Diabase and gabbro (Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 1250

Enumerated_Domain_Value_Definition: Tqgd - Younger quartz diorite and granodiorite (Miocene)

Enumerated_Domain:

Enumerated_Domain_Value: 1292

Enumerated_Domain_Value_Definition:

Tgd - Older granodiorite, quartz diorite, and gabbro (Tertiary)

Enumerated_Domain:

Enumerated_Domain_Value: 1530

Enumerated_Domain_Value_Definition: TMzk - Krugloi Formation (early Tertiary or late Mesozoic?)

Enumerated_Domain:

Enumerated_Domain_Value: 1540

Enumerated_Domain_Value_Definition:

TMzkc - Coarse-grained and conglomeratic sedimentary rocks (early Tertiary or late Mesozoic?)

Enumerated_Domain:

Enumerated_Domain_Value: 1550

Enumerated_Domain_Value_Definition:

TMzu - Basement rocks, undifferentiated (early Tertiary or late Mesozoic?)

Enumerated_Domain:

Enumerated_Domain_Value: 1552

Enumerated_Domain_Value_Definition:

TMzf - Fine-grained sedimentary rocks (early Tertiary or late Mesozoic?)

Enumerated_Domain:

Enumerated_Domain_Value: 1553

Enumerated_Domain_Value_Definition:

TMzc - Coarse-grained and conglomeratic sedimentary rocks (Early Tertiary or late Mesozoic?)

Attribute:

Attribute_Label: NSAMOD

Attribute_Definition:

NSAMOD is a character (8 10 C) item in the polygon attribute table.

Attribute_Definition_Source: this data set

Attribute_Domain_Values:

Unrepresentable_Domain:

ALT - hydrothermal alteration

HFS - contact metamorphism, hornfels

Q - queried unit

Attribute:

Attribute_Label: SOURCE

Attribute_Definition:

SOURCE is a character (6 8 C) item found in both the arc and polygon attribute tables. The values are abbreviated codes representing the original source reference for the arc or polygon feature. The format for SOURCE is XX###, where XX is a two letter code for the 1:250,000 scale quadrangle and ### is a three digit number (with leading zeros). All source codes with '001' are unspecified sources for water and ice features, often paper topographic maps, and DRG or DLG files.

Attribute_Definition_Source: this data set

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: AD002

Enumerated_Domain_Value_Definition:

Coats, R.R., 1956, Geology of northern Adak Island, Alaska: U.S. Geological Survey Bulletin 1028-C, p. 47-67, map, scale 1:50,000.

Enumerated_Domain:

Enumerated_Domain_Value: AD003

Enumerated_Domain_Value_Definition:

Fraser, G.D., and Snyder, G.I., 1959, Geology of southern Adak and Kagalaska Island, Alaska: U.S. Geological Survey Bulletin 1028-M, p. 371-408, map, scale 1:125,000.

Enumerated_Domain:

Enumerated_Domain_Value: AD004

Enumerated_Domain_Value_Definition:

Simons, F.S., and Mathewson, D.E., 1955, Geology of Great Sitkin Island, Alaska: U.S. Geological Survey Bulletin 1028-B, p. 21-43, Plate 5, scale 1:50,000.

Enumerated_Domain:

Enumerated_Domain_Value: AD005

Enumerated_Domain_Value_Definition:

Coats, R.R., 1956, Geology of northern Kanaga Island, Alaska: U.S. Geological Survey Bulletin 1028-D, p. 69-81, Plate 15, scale 1:25,000.

Enumerated_Domain:

Enumerated_Domain_Value: AD006

Enumerated_Domain_Value_Definition:

Fraser, G.D., and Barnett, H.F., 1959, Geology of the Delarof and westernmost Andreanof Islands, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-I, p. 211-248, Plate 28, scale 1:25,000.

Enumerated_Domain:

Enumerated_Domain_Value: AD007

Enumerated_Domain_Value_Definition:

Miller, T.P., Waythomas, C.F., and Nye, C.J., 2003, Preliminary geologic map of Kanaga Volcano, Alaska: U.S. Geological Survey Open-File Report 03-113, 2 sheets, scale 1:20,000.

Enumerated_Domain:

Enumerated_Domain_Value: AD008

Enumerated_Domain_Value_Definition:

Fraser, G.D., and Barnett, H.F., 1959, Geology of the Delarof and westernmost Andreanof Islands, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-I, p. 211-248, Plate 27, scale 1:250,000.

Enumerated_Domain:

Enumerated_Domain_Value: AD009

Enumerated_Domain_Value_Definition:

Waythomas, C.F., Miller, T.P., and Nye, C.J., 2003, Preliminary geologic map of Great Sitkin Volcano, Alaska: U.S. Geological Survey Open-File Report 03-36, 1 sheet, scale 1:63,360.

Enumerated_Domain:

Enumerated_Domain_Value: AD011

Enumerated_Domain_Value_Definition:

Scholl, D.W., Greene, H.G., and Marlow, M.S., 1970, Eocene age of the Adak "Paleozoic(?)" rocks, Aleutian Islands, Alaska: Geological Society of America Bulletin, v. 81, p. 3583-3592.

Enumerated_Domain:

Enumerated_Domain_Value: AD012

Enumerated_Domain_Value_Definition:

Waythomas, C.F., 1995, Surficial geologic map of northern Adak Island, Alaska: U.S. Geological Survey Open-File Report 95-128, 6 p., 1 sheet, scale 1:50,000.

Enumerated_Domain:

Enumerated_Domain_Value: AD013

Enumerated_Domain_Value_Definition:

Coombs, Michele, 2005, unpublished geologic mapping on Tanaga volcano, western Aleutian Islands, written commun., April 2005.

Enumerated_Domain:

Enumerated_Domain_Value: AT002

Enumerated_Domain_Value_Definition:

Gates, Olcott, Powers, H.A., and Wilcox, R.E., 1971, Geology of the Near Islands, Alaska, with a section on Surficial geology by J.P., Schafer: U.S. Geological Survey Bulletin 1028-U, p. 709-822, 3 maps, scale 1:63,360.

Enumerated_Domain:

Enumerated_Domain_Value: AT003

Enumerated_Domain_Value_Definition:

Gates, Olcott, Powers, H.A., and Wilcox, R.E., 1971, Geology of the Near Islands, Alaska, with a section on Surficial geology by J.P., Schafer (Geologic map of Shemya): U.S. Geological Survey Bulletin 1028-U, figure 115, p. 776.

Enumerated_Domain:

Enumerated_Domain_Value: AT004

Enumerated_Domain_Value_Definition:

Gates, Olcott, Powers, H.A., and Wilcox, R.E., 1971, Geology of the Near Islands, Alaska, with a section on Surficial geology by J.P. Schafer: U.S. Geological Survey Bulletin 1028-U, Plate 31 (Agattu Island), 1:63,360.

Enumerated_Domain:

Enumerated_Domain_Value: GI002

Enumerated_Domain_Value_Definition:

Coats, R.R., 1959, Geologic reconnaissance of Gareloi Island, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-J, p. 249-256, 1 plate, no. 33, approx. scale 1:50,000.

Enumerated_Domain:

Enumerated_Domain_Value: GI003

Enumerated_Domain_Value_Definition:

Fraser, G.D., and Barnett, H.F., 1959, Geology of the Delarof and westernmost Andreanof Islands, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-I, p. 211-248, Plates 29, 30, scale 1:250,000 and 1:25,000.

Enumerated_Domain:

Enumerated_Domain_Value: GI005

Enumerated_Domain_Value_Definition:

Fraser, G.D., and Barnett, H.F., 1959, Geology of the Delarof and westernmost Andreanof Islands, Alaska: U.S. Geological Survey Bulletin 1028-I, p. 2110248, Plate 27, scale 1:250,000.

Enumerated_Domain:

Enumerated_Domain_Value: GI006

Enumerated_Domain_Value_Definition:

Coombs, Michele, 2005, unpublished geologic mapping on Tanaga and Gareloi volcanoes, western Aleutian Islands, written commun. April, 2005.

Enumerated_Domain:

Enumerated_Domain_Value: KK002

Enumerated_Domain_Value_Definition:

Coats, R.R., Nelson, W.H., Lewis, R.Q., and Powers, H.A., 1961, Geologic reconnaissance of Kiska Island, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-R, Plate 71, scale 1:63,360.

Enumerated_Domain:

Enumerated_Domain_Value: KK003

Enumerated_Domain_Value_Definition:

Coats, R.R., 1953, Geology of Buldir Island, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 989-A, 26 p.

Enumerated_Domain:

Enumerated_Domain_Value: RI002

Enumerated_Domain_Value_Definition:

Coats, R.R., 1959, Geologic reconnaissance of Semisopochnoi Island, western Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-O, Plate 59.

Enumerated_Domain:

Enumerated_Domain_Value: RI003

Enumerated_Domain_Value_Definition:

Snyder, G.L., 1959, Geology of Little Sitkin Island, Alaska: U.S. Geological Survey Bulletin 1028-H, Plate 23, scale 1:20,000.

Enumerated_Domain:

Enumerated_Domain_Value: RI004

Enumerated_Domain_Value_Definition:

Lewis, R.Q., Nelson, W.H., and Powers, H.A., 1960, Geology of Rat Island, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-Q, Plate 70, scale 1:63,360.

Enumerated_Domain:

Enumerated_Domain_Value: RI005

Enumerated_Domain_Value_Definition:

Powers, H.A., Coats, R.R., and Nelson, W.H., 1960, Geology and submarine physiography of Amchitka Island, Alaska: U.S. Geological Survey Bulletin 1028-P, p. 521-554, 1 plate, scale approx. 1:100,000

Enumerated_Domain:

Enumerated_Domain_Value: RI006

Enumerated_Domain_Value_Definition:

Nelson, W.H., 1959, Geology of Segula, Davidof, and Khvostof Islands Alaska: U.S. Geological Survey 1028-K, p. 257-266, 2 plates, scale 1:25,000.

Detailed_Description:

Entity_Type:

Entity_Type_Label: arcs

Entity_Type_Definition:

Characteristics of the arc features in the geology coverages are coded in the arc attribute table. Table <cov>.aat includes the following items: ARC-CODE, ARC-PARA1, and SOURCE. For explanation of SOURCE, see attribute definitions for polygons.

Entity_Type_Definition_Source: this data set

Attribute:

Attribute_Label: ARC-CODE

Attribute_Definition:

ARC-CODE is a positive integer value (3 3 I) item in the arc attribute table. Values range discontinuously from 0 to 99. Values match one-for-one with geologic features (such as stratigraphic boundary, fault, etc.) Some ARC-CODE values have additional modifiers in item ARC-PARA1.

Attribute_Definition_Source: this data set

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 0

Enumerated_Domain_Value_Definition: hidden line

Enumerated_Domain:

Enumerated_Domain_Value: 1

Enumerated_Domain_Value_Definition: Stratigraphic or intrusive contact, location certain

Enumerated_Domain:

Enumerated_Domain_Value: 2

Enumerated_Domain_Value_Definition: Stratigraphic or intrusive contact, location approximate

Enumerated_Domain:

Enumerated_Domain_Value: 3

Enumerated_Domain_Value_Definition:

Stratigraphic or intrusive contact, location inferred, queried

Enumerated_Domain:

Enumerated_Domain_Value: 4

Enumerated_Domain_Value_Definition:

Normal fault, location certain; if ARC-PARA1 = 1, then upthrown side is on right from origin

Enumerated_Domain:

Enumerated_Domain_Value: 5

Enumerated_Domain_Value_Definition:

Normal fault, location approximate; if ARC-PARA1 = 1, then upthrown side is on right from origin

Enumerated_Domain:

Enumerated_Domain_Value: 6

Enumerated_Domain_Value_Definition:

Normal fault, location inferred or queried; if ARC-PARA1 = 1, then upthrown side is on right from origin

Enumerated_Domain:

Enumerated_Domain_Value: 7

Enumerated_Domain_Value_Definition: Shoreline or riverbank

Enumerated_Domain:

Enumerated_Domain_Value: 9

Enumerated_Domain_Value_Definition: Boundary of altered zone or hornfels; no symbol drawn

Enumerated_Domain:

Enumerated_Domain_Value: 14

Enumerated_Domain_Value_Definition: Caldera or crater rim; hachures on the left from origin

Enumerated_Domain:

Enumerated_Domain_Value: 15

Enumerated_Domain_Value_Definition: Ice contact

Enumerated_Domain:

Enumerated_Domain_Value: 22

Enumerated_Domain_Value_Definition:

Syncline, location approximate; digitized in direction of plunge; ARC-PARA1 equals angle of plunge, 0 is no plunge, 1 is plunge of unknown dip

Enumerated_Domain:

Enumerated_Domain_Value: 30

Enumerated_Domain_Value_Definition: Fault, sense of displacement uncertain; location certain

Enumerated_Domain:

Enumerated_Domain_Value: 31

Enumerated_Domain_Value_Definition: Fault, sense of displacement uncertain; location approximate

Enumerated_Domain:

Enumerated_Domain_Value: 32

Enumerated_Domain_Value_Definition: Fault, sense of displacement uncertain, location inferred

Enumerated_Domain:

Enumerated_Domain_Value: 50

Enumerated_Domain_Value_Definition: Dikes and sills

Enumerated_Domain:

Enumerated_Domain_Value: 51

Enumerated_Domain_Value_Definition: Concealed contact

Enumerated_Domain:

Enumerated_Domain_Value: 52

Enumerated_Domain_Value_Definition: Concealed normal fault

Enumerated_Domain:

Enumerated_Domain_Value: 71

Enumerated_Domain_Value_Definition:

Normal fault, location certain, having right lateral oblique slip

Enumerated_Domain:

Enumerated_Domain_Value: 72

Enumerated_Domain_Value_Definition:

Normal fault, location approx., having right lateral oblique slip

Enumerated_Domain:

Enumerated_Domain_Value: 87

Enumerated_Domain_Value_Definition: Right lateral fault, location certain

Enumerated_Domain:

Enumerated_Domain_Value: 89

Enumerated_Domain_Value_Definition: Right lateral fault, location inferred, queried

Enumerated_Domain:

Enumerated_Domain_Value: 93

Enumerated_Domain_Value_Definition: Lineament

Enumerated_Domain:

Enumerated_Domain_Value: 99

Enumerated_Domain_Value_Definition: Bounding line of coverage

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Address:

Address_Type: mailing address

Address:

MS 902 Box 25286 Denver Federal Center

City: Lakewood

State_or_Province: CO

Postal_Code: 80225

Country: U.S.A.

Contact_Voice_Telephone: 1-888-ASK-USGS

Resource_Description: Open-File Report 2006-1302

Distribution_Liability:

This world-wide web publication was prepared by an agency of the United States Government. Neither the United States Government, nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ARCE

File_Decompression_Technique: zip files

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://pubs.usgs.gov/of/2006/1302/>

Fees: There is no cost for the download of these digital files

Metadata_Reference_Information:

Metadata_Date: 20060918

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: Nora Shew

Contact_Address:

Address_Type: mailing and physical address

Address: 4200 University Drive

City: Anchorage

State_or_Province: Alaska

Postal_Code: 99508-4667

Country: U.S.A.

Contact_Voice_Telephone: 907-786-7445

Contact_Electronic_Mail_Address: nshew@usgs.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998