Geologic map of the Iditarod D-2 and eastern D-3 quadrangles, Alaska, Geologic Report 72, provides 1:63,360-scale geologic mapping of the Beaver Mountains and the surrounding area within the Kuskokwim Mountains uplands. This work was part of a series of reports on the geology, geochemistry, and mineral resources of the Iditarod quadrangle, Alaska. This publication also includes detailed geologic, structural, stratigraphic, and geochronologic data. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/432.

The Mineral Resources section of the Alaska Division of Geological & Geophysical Surveys (DGGS) conducted 500 mi2 of 1:63,360-scale geologic mapping in the northeastern Tanacross Quadrangle (Tanacross D-1, and parts of the C-1, C-2, and D-2 quadrangles), located 15 miles southeast of Chicken, Alaska. The project took place during two periods: a reconnaissance mapping effort June 12-22, 2017, and a detailed campaign from June 18 to July 16, 2018. This map is located within an area of current industry interest; it includes the Taurus porphyry copper-gold-molybdenum +/- rhenium deposit and several other occurrence types, including gold, copper, and molybdenum in porphyritic intrusions, structurally controlled silver-lead-zinc prospects, and placer gold deposits. This map includes unconsolidated surficial deposits in the Tanacross D-1 Quadrangle, the eastern one-third of the Tanacross D-2 Quadrangle, the northern half of the Tanacross B-2 Quadrangle and the northeastern one-third of the Tanacross B-2 Quadrangle. Surficial geology was primarily mapped by interpreting 2.5-m-resolution SPOT 5 color-infrared and natural color red-green-blue (RGB) imagery collected in 2009 and 2010 and stereoscopic pairs of approximately 1:65,000-scale, false-color, infrared aerial photographs taken in 1978 and 1981. Surficial mapping was augmented with helicopter-supported fieldwork June 20-23, 2017 and July 3-4, 2018 to visit exposures and check geologic mapping. The complete report and digital data are available from the DGGS website: http://doi.org/10.14509/30197.

Preliminary geologic map of parts of the Anchorage C-2, C-3, D-2, and D-3 quadrangles, Alaska, Report of Investigation 83-10,RI 83-10 presents 1:25,000-scale geologic mapping of the north-central Chugach Mountains. This rugged area, approximately 120 km NE of Anchorage, straddles the Matanuska Glacier and includes rocks of the southern (lower) Peninsular Terrane and northern Chugach Terrane. Helicopter-supported field work lasted 4-8 weeks each summer during 1980-1982. Most of the previous mapping in the area was at 1:250,000-scale, and this work provides a much more detailed examination of rock types and structures in the area. In particular, the contact between Peninsular and Chugach Terranes (Border Ranges Fault) is present as a complex series of mostly steeply-dipping faults, commonly with ambiguous units separating the two. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/2349.

Geologic map of the McGrath D-6 Quadrangle, Alaska, Professional Report 79, provides 1:63,360-scale geologic mapping of the McGrath D-6 Quadrangle, which lies on the eastern edge of the Kuskokwim Mountains, a maturely dissected upland of accordant rounded ridges and broad lowlands. Two highlands, the Candle Hills and Takotna Mountain, are surrounded by sediment-filled troughs of the Takotna, Tatalina, and Kuskokwim River valleys. Elevations range from 300 to 2,600 ft. This report is the result of 40 man-days of reconnaissance geologic mapping in 1977, 1978, and 1982. Bedrock exposures were mapped on foot and by boat. Four-fifths of the quadrangle is covered by Quaternary deposits, which have been subdivided on the basis of a photo-geologic reconnaissance and limited field checking. The report also includes detailed geologic, structural, stratigraphic, and geochronologic data. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/2253.

Surficial-geologic map of the Seward D-6 Quadrangle, Alaska, Report of Investigation 84-15, shows the distribution of unconsolidated deposits and undifferentiated bedrock around the eastern apex of the Turnagain Arm, in South Central Alaska. This map was prepared principally by interpreting 1:60,000 false-color, infrared aerial photographs taken in 1978 and locally verified by ground observations. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/2374.

Reconnaissance geologic map of the Nome C-3 Quadrangle, Seward Peninsula, Alaska, Open-File Report 72-322, provides (1:63,360-scale) geologic mapping of parts of the U.S. Geological Survey (USGS) Nome C-3 quadrangle. This map was published by the USGS and has been scanned, digitized, and attributed by DGGS staff. The dataset contains geologic, structural, stratigraphic, and geochronologic data organized according to the GeMS and AK GeMS mapping schemas. The geodatabase and ESRI fonts and style files are available from the DGGS website: https://dggs.alaska.gov/pubs/id/10961.

Report of Investigation 97-15C, Surficial geologic map of the Tanana B-1 Quadrangle, central Alaska, provides detailed (1:63,360-scale) surficial geologic mapping of the Tanana B-1 Quadrangle (250 square miles; equivalent to four 7.5 minute quadrangles). The area is part of the Manley Hot Springs-Tofty mining districts and adjacent to the Rampart mining district north of the Tanana A-1 and A-2 Quadrangles. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/2553.