Reger, R.D. Burns, P.A.C. Staft, L.A. 200812 map Report of Investigations RI 2004-1C Fairbanks, AK Alaska Division of Geological & Geophysical Surveys http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=18001 This map illustrates the distribution of unconsolidated deposits and undifferentiated bedrcok units in the Salcha River-Pogo area.It was prepared by interpretation of 1:63,360-scale false-color infrared aerial photographs taken July 1978, July 1979, and August 1981, and is locally verified by ground observations during field visits. To show the distribution of unconsolidated deposits and undifferentiated bedrock units in the Salcha River-Pogo area. This project includes the following shapefiles: >srp_srfgeo surficial geology units, polygons >srp_srfcont surficial geology contacts, lines >srp_pingos pingos, points >srp_terraces terrace risers, lines 197807 197907 198108 2001 2002 2004 ground condition Complete None planned -145.50000 -144.75000 64.75000 64.37500 None surficial geology unconsolidated deposits None alluvium colluvium debris flow deposit landslide deposit retransported loess glacial drift pingos terrace None Salcha River Pogo Goodpaster River Big Delta Quadrangle This report, map, and/or data set are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below). Any hard copies or published data sets utilizing these data sets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these data sets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. Werdon, M.B. Newberry, R.J. Athey, J.E. Szumigala, D.J. 2004 map Report of Investigations RI 2004-1B Initial reconnaissance field observations were made in 2001 and 2002, after which surficial geology air-photo interpretations were done. Contacts were hand-drawn, using a magnifying stereoscope, onto acetate air-photo overlays at the scale of the air-photos (approximately inch-to-the-mile). The air-photos were taken in July 1978, July 1979, and August 1981. During summer field work in 2001 and 2002, map units were described, samples collected for analysis, and a limited number of test pits was dug. The accuracy of the map unit boundary locations vary due to the scale and interpretive nature of the mapping, but are expected to be accurate to at least 20 m. Information from previous geologic reports was incorporated during the interpretation process. Polygon topology is present for polygon shapefiles. This dataset includes shapefiles that contain information about the mapped and interpreted surficial-geologic deposits in the map area. Subsurface data were not available for use in creating these shapefiles, other than scattered soil pits dug to depths no more than about 1 m and observations of exposures in river banks. Soil colors were described using the Munsell soil color charts. The Wentworth scale was used for grain size classification. The surficial geology was first hand-drawn, using a magnifying stereoscope, onto acetate overlays registered to 1:50,000-scale (nominal) prints of digital aerial photographs. The horizontal accuracy of the map unit boundary locations varies due to the scale and interpretive nature of the mapping, but is expected to be accurate to at least 15 m. Geologic contacts on the acetate overlays were transferred to paper USGS topographic maps using a zoom transfer scope. The paper maps were scanned and georeferenced, and map unit boundaries were digitized on-screen into ArcGIS at a zoomed-in scale of approximately 1:25,000. Total horizontal accuracy of the mapped surficial-geologic contacts is believed to be on the order of 25 m or better, with somewhat lesser accuracy expected in areas of rugged relief. Bacon, C.R. Lanphere, M.A. 1996 document U.S. Geological Survey Bulletin B 2152 p. 143-147 Moore, T.E. Dumoulin, J.A. 1996 document U.S. Geological Survey Bulletin B 2152 paper 1996 publication date Bacon and others (1996) Information regarding relative stability of Yukon-Tanana Upland. Pewe, T.L. Burbank, L. Mayo, L.R. 1967 map U.S. Geological survey Miscellaneous Investigations Map I 507 1 sheet, scale 1:500,000 paper 1967 publication date Pewe and others (1967) Information regarding past glaciation in the Yukon-Tanana Upland. Weber, F.R. 1983 document University of Alaska Museum Occasional Paper No. 2 p. 96-100 Thorson, R.M. Hamilton, T.D. 1983 document University fo Alaska Museum Occasional Paper No. 2 paper 1983 publication date Weber (1983) Information regarding past glaciation in the Yukon-Tanana Upland. Weber, F.R. 1986 document Anchorage, Alaska Alaska Geologicl Society p. 79-98 Hamilton, T.D. Reed, K.M. Thorson, R.M. 1986 document Anchorage, Alaska Alaska Geological Society paper 1986 publication date Weber (1986) Information regarding past glaciation in the Yukon-Tanana Upland. Fieldwork- Fieldwork for surficial investigations, including traverses and river exposures, was conducted during the summer of 2001 and 2002.Field notes and sediment samples were collected throughout the map area for surficial investigations. Surficial mapping involved using Pewe and others (1967), and Weber (1983, 1986) on a regular basis for checking glacial geology and general units.Surficial mappers recorded observations on 1:63,360 scale (approximate) color-infrared aerial photographs and 1:63,360 scale topographic base maps. Stations located using air photos and handheld GPS devices with location precision varying from +/-3 to 15 meters. Pewe and others (1967) Weber (1983) Weber (1986) 2001 Geologic map compilation- Surficial geologic map was compiled using field notes from fieldwork process step (above) and all known geologic data from previous work in quadrangle.The main sources of existing data include Bacon and others (1996), Pewe and others (1967), and Weber (1983, 1987). Geologic map contacts were delineated by photointerpretation of 1:63,360-scale color-infrared aerial photographs onto clear acetate overlays. The contacts were transferred from the overlays onto USGS 1:63,360 topographic base maps using a zoom transfer scope, the maps were scanned and georeferenced, and the contacts were then digitized using ArcMap. Polygon topology was established and unit designations assigned in ArcMap. DGGS-standard symbology was applied to polygons, linework, and annotation in ArcMap, and the graphics files were converted into .eps files for export to Adobe Illustrator for final cartographic assembly. Bacon and others (1996) Pewe and others (1967) Weber (1983) Weber (1986) 2004 Vector Universal Transverse Mercator 0 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.001 0.001 meters srp_srfgeo Universal Transverse Mercator 0 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.001 0.001 meters srp_srfcont Universal Transverse Mercator 6 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.001 0.001 meters srp_pingos Universal Transverse Mercator 6 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.001 0.001 meters srp_terraces North American Datum of 1927 Clarke 1866 6378137 298.25722210088 srp_srfgeo srp_srfgeo.shp Surficial geology units, polygons Alaska Division of Geological & Geophysical Surveys SUNIT Surficial-geologic unit shortname Alaska Division of Geological & Geophysical Surveys Qt1 Stream-terrace alluvium Alaska Division of Geological & Geophysical Surveys Qt2 Stream-terrace alluvium Alaska Division of Geological & Geophysical SurveysAlaska Division of Geological & Geophysical Surveys Qgd Undifferentiated glacial drift Alaska Division of Geological & Geophysical Surveys Qa Floodplain alluvium Alaska Division of Geological & Geophysical Surveys Qt Stream-terrace alluviumAlaska Division of Geological & Geophysical Surveys Alaska Division of Geological & Geophysical Surveys Qc Undifferentiated colluvium Alaska Division of Geological & Geophysical Surveys Qcd Debris-flow deposit Alaska Division of Geological & Geophysical Surveys Qcl Landslide deposit Alaska Division of Geological & Geophysical Surveys Qca Mixed colluvium and alluvium Alaska Division of Geological & Geophysical Surveys Qer Retransported loess Alaska Division of Geological & Geophysical Surveys b' Thinly covered bedrock Alaska Division of Geological & Geophysical Surveys b Undifferentiated bedrock Alaska Division of Geological & Geophysical Surveys DESCRIPTIO Text description of surficial unit Alaska Division of Geological & Geophysical Surveys Exposed bedrock Exposed bedrock Alaska Division of Geological & Geophysical Surveys Undifferentiated colluvium Undifferentiated colluvium Alaska Division of Geological & Geophysical Surveys Thinly covered bedrock Thinly covered bedrock Alaska Division of Geological & Geophysical Surveys Stream-terrace deposits? Possible stream-terrace deposits Alaska Division of Geological & Geophysical Surveys Stream-terrace alluvium Stream-terrace alluvium Alaska Division of Geological & Geophysical Surveys Retransported loess Retransported loess Alaska Division of Geological & Geophysical Surveys Mixed colluvium and alluvium Mixed colluvium and alluvium Alaska Division of Geological & Geophysical Surveys Landslide deposits Landslide deposits Alaska Division of Geological & Geophysical Surveys Glacial deposits Glacial deposits Alaska Division of Geological & Geophysical Surveys Floodplain alluvium Floodplain alluvium Alaska Division of Geological & Geophysical Surveys Debris-flow deposit Debris-flow deposit Alaska Division of Geological & Geophysical Surveys ? Landslide deposit Possible landslide deposit Alaska Division of Geological & Geophysical Surveys ? Exposed bedrock Possible exposed bedrock Alaska Division of Geological & Geophysical Surveys Stream-terrace deposits Stream-terrace deposits Alaska Division of Geological & Geophysical Surveys Annoname Text used to label surficial polygons on map Alaska Division of Geological & Geophysical Surveys b Undifferentiated bedrock Alaska Division of Geological & Geophysical Surveys b' Thinly covered bedrock Alaska Division of Geological & Geophysical Surveys Qc Undifferentiated colluvium Alaska Division of Geological & Geophysical Surveys Qca Mixed colluvium and alluvium Alaska Division of Geological & Geophysical Surveys Qcl Landslide deposit Alaska Division of Geological & Geophysical Surveys Qer Retransported loess Alaska Division of Geological & Geophysical Surveys Qgd Undifferentiated glacial drift Alaska Division of Geological & Geophysical Surveys Qt Stream-terrace alluviumAlaska Division of Geological & Geophysical Surveys Alaska Division of Geological & Geophysical Surveys Qcd Debris-flow deposit Alaska Division of Geological & Geophysical Surveys Qa Floodplain alluvium Alaska Division of Geological & Geophysical Surveys srp_srfcont srp_srfcont.shp Contacts for surficial-geologic units, polylines Alaska Division of Geological & Geophysical Surveys srp_pingos srp_pingos.shp Locations of pingos, points Alaska Division of Geological & Geophysical Surveys srp_terraces srp_terraces.shp Terrace risers. ADGGS Surficial-geologic map of the Salcha River-Pogo area, Big Delta Quadrangle, Alaska Includes the following shapefiles, with associated attributes: srp_srgeo.shp: polygon shapefile, surficial geology polygons - SUNIT(suficial-geologic unit designation), DESCRIPTIO (description of surficial-geologic units), Annoname (the text string that was used to label polygons on the published map) srp_srfcont: polyline shapefile, contacts between surficial-geologic units, used to generate printed map - no manually defined attributes srp_pingos: point shapefile, locations of pingos - no manually defined attributes srp_terraces: line shapefile, terrace risers - no manually definedattributes Reger, R.D., Burns, P.A.C.B, and Staft, L.A., 2008, Surficial-geologic map of the Salcha River-Pogo area, Big Delta Quadrangle, Alaska: Alaska Division of Geological & Geophysicla Surveys Report of Investigations RI 2004-1C, 1 sheet, scale 1:63,360. GIS Data Manager State of Alaska, DNR, Division of Geological & Geophysical Surveys mailing and physical

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3354 College Road

Fairbanks AK 99709-3707 (907) 451-5039 (907) 451-5050 dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays. Please contact us through the e-mail address above whenever possible. FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998