Identification_Information: Citation: Citation_Information: Originator: Paul E. Carrara Publication_Date: 2006 Title: Surficial geologic map of the Tanacross B-4 quadrangle, east-central Alaska Edition: Version 1.0 Geospatial_Data_Presentation_Form: Map Series_Information: Series_Name: Scientific Investigations Map Issue_Identification: 2935 Publication_Information: Publication_Place: Denver, Colorado Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/sim/2006/2935 Description: Abstract: The Tanacross B-4 1:63,360-scale quadrangle, through which the Alaska Highway runs, is in east-central Alaska about 100 mi west of the Yukon border. The surficial geologic mapping in the quadrangle is in support of the "Geologic Mapping in support of land, resources, and hazards issues in Alaska" Project of the USGS National Cooperative Geologic Mapping Program. The Tanacross B-4 quadrangle contains parts of two physiographic provinces, the Yukon-Tanana Upland and the Northway-Tanana Lowland. The gently rolling hills of the Yukon-Tanana Upland, in the northern and eastern map area, rise to about 3,100 ft. The Northway-Tanana Lowland, in the western and southern map area, contains the westerly flowing Tanana River. Elevations along the floor of the lowland generally range between 1,540 and 1,700 ft. The dominant feature within the map is the Tok fan, which occupies about 20 percent of the map area. This large, nearly featureless fan contains a high percentage of volcanic clasts derived from outside the present-day drainage of the Tok River. The map provides interpretations of the Quaternary surficial deposits and associated geologic hazards in this area of the upper Tanana valley. Because the map area is dominated by various surficial deposits, the map depicts 13 different Quaternary surficial units consisting of man-made, alluvial, colluvial, organic, lacustrine, and eolian deposits. Deposits shown on this map are generally greater than 1 m thick. The map is accompanied by a text containing unit descriptions incorporating information pertaining to material type, location, associated hazards, resource use (if any), and thickness. Purpose: To update earlier smaller scale geologic mapping, and to provide geologic information for land-use decisions including the possible construction of a proposed high-pressure natural-gas pipeline along the route of the Alaska Highway. Supplemental_Information: Map political location: East-central Alaska Compilation scale: 1:63,360 Geology mapped: 2001-2004 Compilation completed: March 2005 GEOSPATIAL DATAFILES AND OTHER FILES INCLUDED IN THIS DATA SET: tana4geo: geologic units, line features. tana4pnt: radiocarbon dating, volcanic ash, and pingo sites tana4_base.tif,.tfw: 1:63,360-scale topographic base. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology. 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: -143.00 East_Bounding_Coordinate: -142.50 North_Bounding_Coordinate: 63.50 South_Bounding_Coordinate: 63.25 Keywords: Theme: Theme_Keyword_Thesaurus: AGI Glossary of Geology Theme_Keyword: Geologic map Theme_Keyword: Quaternary surficial deposits Place: Place_Keyword_Thesaurus: Board of Geographic Names Place_Keyword: USA Place_Keyword: Alaska Place_Keyword: East-central Alaska Place_Keyword: Upper Tanana Valley Place_Keyword: Yukon-Tanana Upland Place_Keyword: Northway-Tanana Lowland Place_Keyword: Tok Access_Constraints: none Use_Constraints: None. However, acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Paul E. Carrara Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: Mailing address Address: USGS, Box 25406, MS 980, Denver Federal Center City: Denver State_or_Province: Colorado Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-236-1287 Contact_Facsimile_Telephone: 303-236-5349 Contact_Electronic_Mail_Address: pcarrara@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/sim/2006/2935 Browse_Graphic_File_Description: Full-size version of map Browse_Graphic_File_Type: PDF Data_Set_Credit: Field assistance by Jossh P. Beann, Jeff S. Honke, and Florence R. Weber Digital database prepared by Lynn Deberry and Kenzie J. Turner Native_Data_Set_Environment: SunOS, 5.8, sun4u UNIX ArcInfo version 9.0 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Data were entered and checked by the geologist who made the observations. The attributes of this geospatial data set consist of text identifiers that indicate the identity of the geologic unit or type of geologic feature. To check attribute accuracy, a color check plot was visually compared to the geologist's original analog compilation and was corrected as needed. Machine-created listings of unique attribute values were used to identify spelling errors or other inconsistencies, and corrections were made as needed. This map has been thoroughly reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. Logical_Consistency_Report: Map elements were visually checked by the author for overshoots, undershoots, duplicate features, polygon attributes, and other errors. Automated (ArcInfo) routines were also used to check the databases for dangling arcs, intersection errors, and projection information. The map was reviewed by two other geologists for consistency with basic geologic principles and general conformity to USGS mapping standards. Completeness_Report: Data are complete: no features were eliminated or generalized. Unit properties are described in the text explanation. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Geologic contacts and features were plotted from 1:63,000-scale color infrared aerial photographs using a PG-2 stereo plotter onto a topographic mylar base map. Lines were digitized on screen from the scanned mylar. Contacts are estimated to have at least 10 m horizontal accuracy. Lineage: Process_Step: Process_Description: Color infrared aerial photographs were interpreted using the PG-2 plotter to produce a preliminary geologic map. Process_Date: 2004 Process_Step: Process_Description: Field investigation was done to obtain lithologic descriptions of map units and for field checking of geologic features. Process_Date: 2004 Process_Step: Process_Description: Vectorizing of scanned and georegistered mylar geology was done using ArcInfo. Process_Date: 2005 Process_Step: Process_Description: Text map descriptors were added to the .AAT and .PAT databases. Process_Date: 2005 Process_Step: Process_Description: First draft of metadata created by K. Turner using FGDCMETA.AML ver. 1.32 01/11/99 on ArcInfo data set tanab4geo Process_Date: 2005 Process_Step: Process_Description: The geospatial databases and metadata were quality checked for completeness and consistency. Process_Date: 2005 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: 7 Transverse_Mercator: Scale_Factor_at_Central_Meridian: .999600 Longitude_of_Central_Meridian: -141.00 Latitude_of_Projection_Origin: 0 False_Easting: 500000.0 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 2.85315 Ordinate_Resolution: 2.85315 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: 294.98 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: The complete geologic map database comprises two component ArcInfo coverages (tana4geo and tana4pnt). The tana4geo coverage contains all contact lines and label points for each of the map polygons. The tana4pnt coverage includes point data for radiocarbon age and volcanic ash sites as well as pingo locations and indicators of wind direction. >------------------------------------------------------------- >COVERAGE NAME: tana4geo >------------------------------------------------------------- > >DATABASE STRUCTURE OF: TANA4GEO.PAT > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 4 12 F 3 > 5 PERIMETER 4 12 F 3 > 9 TANA4GEO# 4 5 B - > 13 TANA4GEO-ID 4 5 B - > 17 UNIT 10 10 C - > 27 DESCRIPTION 100 100 C - > >ATTRIBUTE NAMES: UNIT, DESCRIPTION > >DESCRIPTION OF ATTRIBUTES: >UNIT: label given to polygons representing name of geologic > entities as defined in Description of Map Units >DESCRIPTION: Brief geologic explanation of unit with age > >UNIQUE ITEM LIST FOR TANA4GEO.PAT: > >UNIT DESCRIPTION >af Artificial fill (latest Holocene) >Qfto Floodplain alluvium of Tok River (Holocene) >Qfpt Floodplain alluvium of Tanana River (Holocene) >Qtfy Younger Tok fan deposit (Holocene and late Pleistocene) >Qte Terrace alluvium of Tanana River (late Pleistocene) >Qtfo Older Tok fan deposit (middle Pleistocene) >Qca Colluvium and alluvium (Holocene and late Pleistocene) >Qfa Fan deposits (Holocene and late Pleistocene) >Qls Landslide deposits (Holocene and late Pleistocene) >Qlo Loess (Holocene) >Qes Eolian sand (late Pleistocene) >Qla Lacustrine deposits (late Pleistocene) >Qor Organic-rich deposits (Holocene and late Pleistocene) >Br Granitic, metamorphic, and volcanic rocks (Quaternary(?) to Paleozoic) >gravel pit >lake >river Tanana River >Qes(dunes) > > >DATABASE STRUCTURE OF TANA4GEO.AAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 FNODE# 4 5 B - > 5 TNODE# 4 5 B - > 9 LPOLY# 4 5 B - > 13 RPOLY# 4 5 B - > 17 LENGTH 4 12 F 3 > 21 TANA4GEO# 4 5 B - > 25 TANA4GEO-ID 4 5 B - > 29 DESCRIPTION 100 100 C - > >ATTRIBUTE NAME: DESCRIPTION > >DESCRIPTION OF ATTRIBUTE: >DESCRIPTION: Brief geologic description of line type taken > from Digital Cartographic Standards. > >UNIQUE ITEM LIST FOR TANA4GEO.AAT > >DESCRIPTION >contact >abandoned meander >escarpment in dune area >terrace scarp >shoreline >scratch contact >map boundary > >------------------------------------------------------------- >COVERAGE NAME: tana4pnt >------------------------------------------------------------- > >DATABASE STRUCTURE OF TANA4PNT.PAT > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 4 12 F 3 > 5 PERIMETER 4 12 F 3 > 9 TANA4PNT# 4 5 B - > 13 TANA4PNT-ID 4 5 B - > 17 AZIMUTH 5 5 I - > 22 DESCRIPTION 100 100 C - > >ATTRIBUTE NAMES: AZIMUTH, DESCRIPTION > >DESCRIPTION OF ATTRIBUTES: >AZIMUTH: Compass direction indicating depositional wind > direction >DESCRIPTION: Description of point feature > >UNIQUE ITEM LIST FOR TANA4PNT.PAT: >AZIMUTH: 0-360 >DESCRIPTION: pingo > radiocarbon age site > volcanic ash site > depositional wind direction, as indicated by dune form > Entity_and_Attribute_Detail_Citation: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: Mailing address Address: Denver Publishing Service Center U.S. Geological Survey MS 902, Box 25046, DFC City: Denver State_or_Province: Colorado Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-5486 Distribution_Liability: Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARCE, SHP Format_Version_Number: 9.0 Format_Version_Date: 2004 File_Decompression_Technique: GZIP compressed TAR file (Unix), and ZIP archive (Windows) Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/sim/2006/2935 Fees: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: USGS Information Services Denver Federal Center Box 25286 City: Denver State_or_Province: Colorado Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 1-888-ASK-USGS Resource_Description: Scientific Investigations Map 2935 (Map-On-Demand) Distribution_Liability: none Standard_Order_Process: Non-digital_Form: Available as one printed sheet. Order from USGS at the address listed above or see http://rmmcweb.cr.usgs.gov/public/mod/order.html for more ordering information. Fees: For current charges please see http://rmmcweb.cr.usgs.gov/public/mod/order.html Metadata_Reference_Information: Metadata_Date: 2005 Metadata_Review_Date: 2005 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Kenzie J. Turner Contact_Address: Address_Type: mailing address Address: Box 25046, MS 980, Denver Federal Center City: Denver State_or_Province: Colorado Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-4610 Contact_Facsimile_Telephone: 303-236-5349 Contact_Electronic_Mail_Address: kturner@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata ("CSDGM version 2") Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: none Metadata_Use_Constraints: none