tana1pingo_point types and locations of pingos tana1srf_polygon comprehensive geologic polygons tana1srfpts_point locations of measured stratigraphic sections or fossils tana2pingo_point types and locations of pingos tana2srf_polygon comprehensive geologic polygons tana2srfpts_point locations of measured stratigraphic sections or fossils
Pinney, D.S., 1998, Surficial geologic map of the Tanana A-1 and A-2 quadrangles, central Alaska: Public Data File PDF 98-37C, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), Fairbanks, AK, USA.Online Links:
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000064
Ordinates (y-coordinates) are specified to the nearest 0.000064
Planar coordinates are specified in meters
| Value | Definition |
|---|---|
| b | Exposed bedrock- bedrock with essentially no cover |
| bc | Thinly covered bedrock- bedrock covered by thin (generally less than 1-m thick) veneer of surficial debris |
| Qaf | Alluvial fan deposits-Fan-shaped, heterogeneous mixtures of gravel with some sand and silt and few to numerous, subangular to rounded boulders, especially in proximal areas; clasts locally derived; may include debris-flow deposits; thick to thin bedded; surface smooth, except for numerous shallow, interconnected channels; locally covered by reworked silt. |
| Qa | Alluvium in modern stream channels-Elongated deposits of stratified gravel and sand with few to numerous boulders underlying active streams, flood plains, and associated low terraces; well sorted and medium to thick bedded, locally cross-bedded; shows fining-upward cycles. |
| Qap | Alluvial plain deposits-Irregular blankets and low-angle fans of stratified gravel and sand with silt interbeds and few to numerous boulders underlying much of Baker Creek flats; well sorted and medium to thick bedded, locally cross-bedded; surface flat to gently sloping with numerous shallow, interconnected channels |
| Qas | Silty alluvium in modern stream channels-Irregular, elongated deposits of stratified silt beneath modern channels and flood plains of streams draining loess-mantled slopes; may include fine-grained debris flow deposits, especially in the upper reaches; moderately to well sorted and medium to thin bedded, locally cross-bedded. |
| Qfp | Floodplain alluvium bordering modern streams-Elongated deposits of stratified pebble-cobble gravel and medium sand with few to numerous boulders forming modern flood plains and associated low (~3 m) terraces; typically mantled by thin layer of silty over-bank deposits |
| Qsf | Silt fan deposits-Fan-shaped deposits of dark brown to gray silt with some sand and angular to subrounded pebbles in proximal areas; may include fine-grained debris flow deposits, especially in the upper reaches; thick to thin bedded; surface smooth, except for numerous shallow, interconnected channels |
| Qag | Old, high-level alluvial gravels-Irregular residual deposits of gold-bearing, pebble-cobble gravel with well rounded quartzite boulders up to 3 m diameter preserved on high interfluves in the Eureka Creek area; up to 4 m thick, but generally much thinner; locally extensively reworked by mining activity |
| Qac | Undifferentiated alluvial and colluvial valley-fill deposits-Fan-shaped and elongated heterogeneous mixtures of subangular rock fragments and gravel with some silt and sand deposited in upper stream courses primarily by brief, intense summer stream flow, debris flows, and gelifluction; surface smooth, except for local low scarps and shallow, steep-sided channels. |
| Qc | Undifferentiated colluvium-Irregular, heterogeneous blankets, aprons, and fans of angular to subrounded rock fragments, gravel, sand, and silt that are left on slopes, slope bases, or high-level surfaces by residual weathering and complex mass-movement processes, including rolling, sliding, flowing, gelifluction, and frost creep |
| Qca | Colluvial apron and fan deposits-Apron- and fan-shaped, heterogeneous mixtures of angular rock fragments with trace to some gravel, sand, and silt deposited at the bases of steep walls of modern stream valleys; may include or be capped by a considerable amount of redeposited eolian silt; locally washed by meltwater and slope runoff; surface steep to gently sloping. |
| Qel | Loess-Homogeneous blankets of well-sorted, mottled, light grayish-brown silt deposited by eolian processes; generally structureless, but with broadly horizontal bedding and some laminations, wavy bedding, and small-scale cross-bedding; contains scattered small charcoal fragments and root casts; local cryoturbation structures |
| Qelp | Pitted loess-Homogeneous blankets of mottled, light grayish-brown silt and organic silt deposited by eolian processes and subsequently modified by melting of ice-rich permafrost; generally massive to locally bedded |
| Qer | Reworked upland silt--Heterogeneous blankets of silt and organic silt originally laid down by eolian processes and subsequent minor to extensive reworking by fluvial and colluvial processes; includes silt-rich debris-flow deposits; may contain angular clasts of local origin; massive to thinly bedded, with some wavy bedding and cross-bedding; commonly perennially frozen and ice rich |
| Qld | Delta deposits-Fan-shaped, heterogeneous mixture of well sorted silt, sand, and gravel; thick to thin bedded; shows cross-bedding and fining-upward cycles; surface smooth, except for numerous shallow, interconnected channels. |
| Qs | Swamp deposits-Semicircular to irregular deposits of silt and peat in poorly-drained areas; saturated and locally frozen below a depth of about 1 m, locally ice rich; surface flat and smooth, may have standing water. |
| Qmt | Mine tailings-Water-washed pebble-cobble gravel with trace to some sand reworked by placer mining operations; typically well sorted; surface irregular or forming symmetrical ridges and cones. |
| WATER | body of water |
| Value | Definition |
|---|---|
| b | Exposed bedrock- bedrock with essentially no cover |
| bc | Thinly covered bedrock- bedrock covered by thin (generally less than 1-m thick) veneer of surficial debris |
| Qaf | Alluvial fan deposits-Fan-shaped, heterogeneous mixtures of gravel with some sand and silt and few to numerous, subangular to rounded boulders, especially in proximal areas; clasts locally derived; may include debris-flow deposits; thick to thin bedded; surface smooth, except for numerous shallow, interconnected channels; locally covered by reworked silt. |
| Qa | Alluvium in modern stream channels-Elongated deposits of stratified gravel and sand with few to numerous boulders underlying active streams, flood plains, and associated low terraces; well sorted and medium to thick bedded, locally cross-bedded; shows fining-upward cycles. |
| Qap | Alluvial plain deposits-Irregular blankets and low-angle fans of stratified gravel and sand with silt interbeds and few to numerous boulders underlying much of Baker Creek flats; well sorted and medium to thick bedded, locally cross-bedded; surface flat to gently sloping with numerous shallow, interconnected channels |
| Qas | Silty alluvium in modern stream channels-Irregular, elongated deposits of stratified silt beneath modern channels and flood plains of streams draining loess-mantled slopes; may include fine-grained debris flow deposits, especially in the upper reaches; moderately to well sorted and medium to thin bedded, locally cross-bedded. |
| Qfp | Floodplain alluvium bordering modern streams-Elongated deposits of stratified pebble-cobble gravel and medium sand with few to numerous boulders forming modern flood plains and associated low (~3 m) terraces; typically mantled by thin layer of silty over-bank deposits |
| Qsf | Silt fan deposits-Fan-shaped deposits of dark brown to gray silt with some sand and angular to subrounded pebbles in proximal areas; may include fine-grained debris flow deposits, especially in the upper reaches; thick to thin bedded; surface smooth, except for numerous shallow, interconnected channels |
| Qac | Undifferentiated alluvial and colluvial valley-fill deposits-Fan-shaped and elongated heterogeneous mixtures of subangular rock fragments and gravel with some silt and sand deposited in upper stream courses primarily by brief, intense summer stream flow, debris flows, and gelifluction; surface smooth, except for local low scarps and shallow, steep-sided channels. |
| Qc | Undifferentiated colluvium-Irregular, heterogeneous blankets, aprons, and fans of angular to subrounded rock fragments, gravel, sand, and silt that are left on slopes, slope bases, or high-level surfaces by residual weathering and complex mass-movement processes, including rolling, sliding, flowing, gelifluction, and frost creep |
| Qca | Colluvial apron and fan deposits-Apron- and fan-shaped, heterogeneous mixtures of angular rock fragments with trace to some gravel, sand, and silt deposited at the bases of steep walls of modern stream valleys; may include or be capped by a considerable amount of redeposited eolian silt; locally washed by meltwater and slope runoff; surface steep to gently sloping. |
| Qel | Loess-Homogeneous blankets of well-sorted, mottled, light grayish-brown silt deposited by eolian processes; generally structureless, but with broadly horizontal bedding and some laminations, wavy bedding, and small-scale cross-bedding; contains scattered small charcoal fragments and root casts; local cryoturbation structures |
| Qelp | Pitted loess-Homogeneous blankets of mottled, light grayish-brown silt and organic silt deposited by eolian processes and subsequently modified by melting of ice-rich permafrost; generally massive to locally bedded |
| Qer | Reworked upland silt--Heterogeneous blankets of silt and organic silt originally laid down by eolian processes and subsequent minor to extensive reworking by fluvial and colluvial processes; includes silt-rich debris-flow deposits; may contain angular clasts of local origin; massive to thinly bedded, with some wavy bedding and cross-bedding; commonly perennially frozen and ice rich |
| Qs | Swamp deposits-Semicircular to irregular deposits of silt and peat in poorly-drained areas; saturated and locally frozen below a depth of about 1 m, locally ice rich; surface flat and smooth, may have standing water. |
| Qmt | Mine tailings-Water-washed pebble-cobble gravel with trace to some sand reworked by placer mining operations; typically well sorted; surface irregular or forming symmetrical ridges and cones. |
| Value | Definition |
|---|---|
| intact | The pingo was observed to be intact |
| collapsed | The pingo was observed to be collapsed |
| Value | Definition |
|---|---|
| intact | The pingo was observed to be intact |
| collapsed | The pingo was observed to be collapsed |
| Value | Definition |
|---|---|
| measured section | Location of a measured stratigraphic section |
| fossil | Location of a fossil |
| Value | Definition |
|---|---|
| A | Stratigraphic location "97DP009 - Gravel Pit". ***Note: points having the software-defined attribute/column FID whose values are 1 and 3 are both listed in attribute/column "NAME" with a value of "A", however the attribute/column FID whose value is 1 should be labeled "B" in the attribute/column "NAME", corresponding to the stratigraphic section "97DP020 - Doric Creek". Locations "A" and "B" are labelled correctly on the Preliminary Surficial Geologic Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37C-SH1). |
| 2 | Fossil sample location, see fossil fauna descriptions on the Preliminary Surficial Geologic Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37C-SH1) for more information |
| 4 | Fossil sample location, see fossil fauna descriptions on the Preliminary Surficial Geologic Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37C-SH1) for more information |
| Value | Definition |
|---|---|
| measured section | Location of a measured stratigraphic section |
| fossil | Location of a fossil |
| Value | Definition |
|---|---|
| C | Stratigraphic location "97DP027 - Miller Gulch" |
| D | Stratigraphic location "97DP030 - Dalton Gulch" |
| 1 | Fossil sample location, see fossil fauna descriptions on the Preliminary Surficial Geologic Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37C-SH1) for more information |
| 3 | Fossil sample location, see fossil fauna descriptions on the Preliminary Surficial Geologic Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37C-SH1) for more information |
Funding for the geologic mapping and geochronologic dating performed for this project was provided by the U.S. Geological Survey STATEMAP Program under award number 03HQAG0055 and by the Alaska State Legislature.
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The Tanana A-1 and A-2 Quadrangles lie between the villages of Rampart, on the Yukon River, and Manley Hot Springs, at the terminus of the Elliott Highway. At the time the report was published, the area towns were not part of any municipal or local governmental jurisdiction. The investigation of gold, tin, and other mineral occurrences in conjunction with comprehensive geologic mapping and recently-acquired geophysical data will provide a scientific basis for expanded mineral exploration and development that can lead to the economic growth and the creation of new jobs needed by the Rampart-Manley-Tofty region's inhabitants and the State of Alaska. These objectives are consistent with the statewide goals and priorities articulated for the Department of Natural Resources by Alaska's Governor in his Executive Budget Summary for Fiscal Year 1997.
Eakin, H.M., 1912, The Rampart and Hot Springs regions: U.S. Geological Survey Bulletin Bulletin 520, U.S. Geological Survey, Reston, VA, USA.
Eakin, H.M., 1913, A geologic reconnaissance of a part of the Rampart Quadrangle, Alaska: U.S. Geological Survey Bulletin Bulletin 535, U.S. Geological Survey, Reston, VA, USA.
Hopkins, D.M., and Taber, B., 1962, Asymmetrical valleys in central Alaska (abs.): Special Paper v. 68, Geological Society of America, Boulder, CO, USA.
Newberry, R.J., and Clautice, K.H., 1997, Compositions of placer gold in the Rampart-Eureka-Manley-Tofty area, eastern Tanana and western Livengood quadrangles, central Interior Alaska, determined by electron microprobe analysis: Public Data File PDF 97-49, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), Fairbanks, AK, USA.Online Links:
Wagner, A.A., 1957, The use of the Unified Soil Classification System by the Bureau of Reclamation: Proceedings v. I, 4th International Conference on Soil Mechanics and Foundation Engineering, London, England.
Yeend, W.E., 1989, Gold placers, geomorphology, and paleo-drainage of Eureka Creek and Tofty areas, Alaska: U.S. Geological Survey Bulletin Bulletin 1946, U.S. Geological Survey, Reston, VA, USA.
Data sources used in this process:
Data sources used in this process:
Data sources used in this process:
Reifenstuhl, R.R., Dover, J.H., Newberry, R.J., Clautice, K.H., Pinney, D.S., Liss, S.A., Blodgett, R.B., and Weber, F.R., 1998, Geologic map of the Tanana A-1 and A-2 quadrangles, central Alaska: Public Data File PDF 98-37A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
Reifenstuhl, R.R., Dover, J.H., Newberry, R.J., Clautice, K.H., Liss, S.A., Blodgett, R.B., and Weber, F.R., 1998, Interpretive geologic bedrock map of the Tanana A-1 and A-2 quadrangles, central Alaska: Public Data File PDF 98-37B, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), Fairbanks, AK, USA.Online Links:
Pinney, D.S., 1998, Derivative engineering geologic map of the Tanana A-1 and A-2 quadrangles, central Alaska: Public Data File PDF 98-37D, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
Data for surficial and materials point, line, and polygon data were determined in the field using 1:63,360-scale topographic maps and 1:50,000 (nominal) scale, color-infrared aerial photographs. Geologic data included in the compilation are the field maps and notes from this project as well as data from other sources as noted in the "Sources Cited" section. Attributes were verified for consistency and completeness during the creation of the metadata.
DGGS location data and estimated position errors were manually entered into a spreadsheet. Sample numbers and locations with selected data were spatially registered and analyzed in ArcGIS software. Location data for the surficial and materials maps were determined visually using topographic maps at a scale of 1:63,360 and 1:50,000 (nominal) scale, color-infrared aerial photographs. See "Source_Information" section for horizontal positional accuracy of locations not measured by DGGS.
This dataset includes geospatial information about geologic units, their ages, fossil, and field sample locations, structural features, surficial features, and structural measurements.
Polygon topology present and clean on appropriate data. Other data are line, point, or annotation data and do not require topologic relationships.
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Public Data File 98-37C
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