Identification_Information: Citation: Citation_Information: Originator: Paul E. Carrara Publication_Date: 2007 Title: Geologic Map and Engineering Properties of the Surficial Deposits of the Tok Area, east-central Alaska Edition: 1.0 Geospatial_Data_Presentation_Form: Map Series_Information: Series_Name: Scientific Investigations Map Issue_Identification: 2986 Publication_Information: Publication_Place: Denver, Colorado Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/sim/2986 Description: Abstract: The Tok area 1:100,000-scale map, through which the Alaska Highway runs, is in east-central Alaska about 160 km west of the Yukon border. The surficial geologic mapping in the map area 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 Tok map area contains parts of three physiographic provinces, the Alaska Range, the Yukon-Tanana Upland, and the Northway-Tanana Lowland. The high, rugged, glaciated landscape of the eastern Alaska Range dominates the southwestern map area. The highest peak, an unnamed summit at the head of Cathedral Rapids Creek No. 2, rises to 2166 m. The gently rolling hills of the Yukon-Tanana Upland, in the northern map area, rise to about 1000 m. The Northway-Tanana Lowland contains the valley of the westerly flowing Tanana River. Elevations along the floor of the lowland generally range between 470 and 520 m. The dominant feature within the map is the Tok fan, which occupies about 20 percent of the map area. This large (450 km^2), nearly featureless fan contains a high percentage of volcanic clasts derived from outside the present-day drainage of the Tok River. Because the map area is dominated by various surficial deposits, the map depicts 26 different surficial units consisting of man-made, alluvial, colluvial, eolian, lacustrine, organic, glaciofluvial, glacial, and periglacial deposits. The accompanying table provides information concerning the various units including their properties, characteristics, resource potential, and associated hazards in this area of the upper Tanana valley. Purpose: To provide a summary of recently published geologic information in the upper Tanana Valley in an easy to use tabular form 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: Alaska Compilation scale: 1:100,000 Geology mapped: 2001-2004 Compilation completed: 2006 Files included in the dataset: tanaeng: Geologic units and line features tanaengpnt: Radiocarbon dating sites, pingo, volcanic ash, and gravel pit sites and deposition wind direction indicators The topographic basemap is comprised of the following three topographic maps derived from the USGS 1:63,360 series. tana4base.tif/.tfw tana5base.tif/.tfw tana6base.tif/.tfw 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 ARC/INFO format, this metadata file may include some ARC/INFO- specific terminology. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2007 Currentness_Reference: Publication date Status: Progress: Complete Maintenance_and_Update_Frequency: Complete Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -144.00 East_Bounding_Coordinate: -142.50 North_Bounding_Coordinate: 63.50 South_Bounding_Coordinate: 63.250 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: Tok Place_Keyword: Tanacross Place_Keyword: Upper Tanana Valley Place_Keyword: Yukon-Tanana Upland Place_Keyword: Northway-Tanana Lowland Place_Keyword: Alaska Range 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: Box 25046, MS 980, DFC City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-236-1287 Contact_Facsimile_Telephone: 303-236-5349 Contact_Electronic_Mail_Address: pcarrara@usgs.gov Data_Set_Credit: Field assistance from F. R. Weber, J. S. Honke, and J. P. Beann. Digital database prepared by Kenzie J. Turner. Native_Data_Set_Environment: ArcInfo version 9.1 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: This dataset is a compilation of previously published geology consisting of three adjacent quadrangles. Original geologic contacts and features were plotted from 1:60,000-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: Source_Information: Source_Citation: Citation_Information: Originator: Paul E. Carrara Publication_Date: 2004 Title: Surficial geologic map of the Tanacross B-5 quadrangle, east-central Alaska Geospatial_Data_Presentation_Form: Map Series_Information: Series_Name: Scientific Investigations Map Issue_Identification: 2856 Publication_Information: Publication_Place: Denver, CO Publisher: U.S. Geological Survey Source_Scale_Denominator: 63,360 Type_of_Source_Media: PDF and Arc coverages Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2004 Source_Currentness_Reference: Publication date Source_Citation_Abbreviation: (Carrara, 2004b) Source_Contribution: surficial geology for the Tanacross B-5 Quadrangle Source_Information: Source_Citation: Citation_Information: Originator: Paul E. Carrara Publication_Date: 2004 Title: Surficial geologic map of the Tanacross B-6 quadrangle, east-central Alaska Geospatial_Data_Presentation_Form: Map Series_Information: Series_Name: Scientific Investigations Map Issue_Identification: 2850 Publication_Information: Publication_Place: Denver, CO Publisher: U.S. Geological Survey Source_Scale_Denominator: 63,360 Type_of_Source_Media: PDF and Arc coverages Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2004 Source_Currentness_Reference: Publication date Source_Citation_Abbreviation: (Carrara, 2004a) Source_Contribution: surficial geology for the Tanacross B-6 Quadrangle Source_Information: Source_Citation: Citation_Information: Originator: Paul E. Carrara Publication_Date: 2006 Title: Surficial geologic map of the Tanacross B-4 quadrangle, east-central Alaska Geospatial_Data_Presentation_Form: Map Series_Information: Series_Name: Scientific Investigations Map Issue_Identification: 2935 Publication_Information: Publication_Place: Denver, CO Publisher: U.S. Geological Survey Source_Scale_Denominator: 63,360 Type_of_Source_Media: PDF and Arc coverages Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2006 Source_Currentness_Reference: Publication date Source_Citation_Abbreviation: (Carrara, 2006) Source_Contribution: surficial geology and point features for the Tanacross B-4 Quadrangle Process_Step: Process_Description: Digitally combined Arc coverages from Carrara (2004a, 2004b, 2006). Process_Date: 2005 Process_Step: Process_Description: Draft plots were produced to check for data accuracy. Process_Date: 2006 Process_Step: Process_Description: First draft of metadata created by Kenzie Turner using FGDCMETA.AML ver. 1.32 01/11/99 on ArcInfo data set tanaeng Process_Date: 2006 Process_Step: Process_Description: Database files and map layout were checked for comformity to U.S. Geological Survey map standards. Process_Date: 2007 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: 0.9996 Longitude_of_Central_Meridian: -141.00 Latitude_of_Projection_Origin: 0 False_Easting: 500000.00 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 10 Ordinate_Resolution: 10 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 (tanaeng and tanaengpnt). The tanaeng coverage contains all contact lines and label points for each of the map polygons. The tanaengpnt coverage includes point data for radiocarbon age and volcanic ash sites as well as pingo and gravel pit locations and indicators of wind direction. >---------------------------------------------------------------- >TANAENG.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 TANAENG# 4 5 B - > 21 TANAENG-ID 4 5 B - > 25 UNIT 10 10 C - > 35 DESCRIPTION 100 100 C - > >Attribute names: UNIT, DESCRIPTION >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 tanaeng.pat: >UNIT DESC >af artificial fill (latest Holocene) >Qfpt Floodplain alluvium of Tanana River (Holocene) >Qfpto Floodplain alluvium of Tok River (Holocene) >Qfpr Floodplain alluvium of Robertson River (Holocene) >Qtfy Younger Tok fan deposit (Holocene and late Pleistocene) >Qalt Alluvium(?) of Tanana River (Holocene and late Pleistocene) >Qte Terrace alluvium of Tanana River (late Pleistocene) >Qtfo Older Tok fan deposit (middle Pleistocene) >Qac Active channels, alluvium, and debris flow deposits of streams from Alaska Range (late Holocene) >Qfa Fan deposits along front of Alaska Range (Holocene and late Pleistocene) >Qfc Coalescing fan deposits along front of Alaska Range (Holocene and late Pleistocene) >Qfaa Small fan deposits mainly in Alaska Range (Holocene and late Pleistocene) >Qca Undivided colluvium and alluvium (Holocene and late Pleistocene) >Qfco Older coalescing fan deposits along front of Alaska Range (middle to early(?) Pleistocene) >Qco Colluvium, undivided (Holocene and late Pleistocene) >Qta Talus deposits (Holocene and late Pleistocene) >Qls Landslide deposits (Holocene and late Pleistocene) >Qlo Loess (Holocene) >Qes Eolian sand (Holocene and late Pleistocene) >Qes(dunes) Eolian sand (Holocene and late Pleistocene) >Qla Lacustrine deposits (Holocene and late Pleistocene) >Qor Organic-rich deposits (Holocene and late Pleistocene) >Qow Outwash of former Robertson Glacier (late Pleistocene) >Qty Donnelly-age till of Alaska Range glaciers (late Pleistocene) >Qto Delta-age till of Alaska Range glaciers (middle Pleistocene) >Qrg Rock glacier deposits (Holocene and late Pleistocene) >QTfe Felsenmeer (Pleistocene and Pliocene(?)) >Br Bedrock (Quaternary(?) to Paleozoic) >river Tanana River >lake >----------------------------------------------------------------- >TANAENG.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 8 18 F 5 > 25 TANAENG# 4 5 B - > 29 TANAENG-ID 4 5 B - > 33 DESCRIPTION 100 100 C - > >Attribute names: DESCRIPTION >DESCRIPTION: Brief geologic description of line type taken > from Digital Cartographic Standards. > >Unique items list for tanaeng.aat: >Contact >Glacial meltwater channel >Gravel pit boundary >Shoreline >Volcanic crater >Abandoned meander >Escarpment in sand dune field >Map boundary >Moraine crest >Terrace scarp >Scratch contact >---------------------------------------------------------------- >TANAENGPNT.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 TANAENGPNT# 4 5 B - > 21 TANAENGPNT-ID 4 5 B - > 25 AZIMUTH 5 5 I - > 30 DESCRIPTION 100 100 C - > 130 AGE 25 25 C - > >Attribute names: AZIMUTH, DESCRIPTION, AGE >AZIMUTH:Compass direction indicating depositional wind direction >DESCRIPTION:Description of point feature >AGE:Age for radiocarbon sites in radiocarbon years before present > >Unique items list for tanaengpnt.pat: >AZIMUTH: 0-360 >***a value of zero represents a null value >DESCRIPTION: > Pingo > Volcanic ash site > Radiocarbon age site > Depositional wind direction as indicated by dune form > Gravel pit >AGE: (age in radiocarbon years before present) > 12,515 +/- 40 > 41,880 +/- 470 > 1,610 +/- 40 > 11,715 +/- 40 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: Central Publications Group Box 25046, MS 902, DFC City: Denver State_or_Province: CO Postal_Code: 80225 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: 9.1 Format_Version_Date: 2005 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/2986 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 Box 25286, Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 1-800-ASK-USGS 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://store.usgs.gov/mod/order.html for more ordering information. Fees: For current charges please see http://store.usgs.gov/mod/order.html Metadata_Reference_Information: Metadata_Date: 20061107 Metadata_Review_Date: 20070710 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, DFC City: Denver State_or_Province: CO Postal_Code: 80225 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