hflsa1_polygon geologic bedrock unit polygons (hornfels) hflsa2_polygon geologic bedrock unit polygons (hornfels) tana12_att_point points for the strike, dip, and plunge of bedding planes, foliation, and various lineaments tana1bur_arc vector lines for various types of geophysical features tana1fld_arc types of folds, anticlines, synclines, or lines depicting a cross-section tana1fld_point points for types of anticlines or synclines tana1geo_arc geologic bedrock unit contacts (arc) tana1geo_polygon geologic bedrock units (polygon) tana1str_arc vector lines for types of faults tana2bur_arc vector lines for various types of geophysical features tana2fld_arc types of folds, anticlines, synclines, or lines depicting a cross-section tana2fld_point points for types of anticlines or synclines tana2geo_arc geologic bedrock unit contacts (arc) tana2geo_polygon geologic bedrock units (polygon) tana2str_arc vector lines for types of faults
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 v 1.1, 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
The horizontal datum used is D_Clarke_1866.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6,378,206.4.
The flattening of the ellipsoid used is 1/294.978698.
| Value | Definition |
|---|---|
| 0 | Hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes |
| 5 | Contact |
| Value | Definition |
|---|---|
| Kwcv | Wilber Creek unit siliciclastic and volcaniclastic rocks (late Albian(?): Weber and others, 1992)-Very dark gray to dark greenish dark gray, volcanic clast-bearing, poorly sorted, sub-angular, medium- to coarse-grained, marine, argillaceous lithic sandstone, shale and siltstone. Estimates of the framework grain composition are: 55 percent chert, 25 percent quartz, 15 percent plagioclase (which includes about 5 percent obvious volcanic clasts), and 5 percent sedimentary and metamorphic rock fragments, and minor white mica. |
| Kwcs | Wilber Creek unit sandstone, shale, siltstone, undivided (Albian: Weber and others, 1992)-Very dark gray to dark greenish gray, poorly sorted, marine, argillaceous lithic sandstone, shale and siltstone containing white mica-bearing argillaceous sandstone as laminae and thin interbeds; rare conglomerate. Beds are typically thin, parallel, laterally continuous, sharp-based, and graded; from fine to medium grained at the base, grading up to silt at the top of beds. |
| KJwq | Wolverine quartzite unit (Early Cretaceous and Late Jurassic: Weber and others, 1992)-Very light gray to tan, white- to medium gray-weathering, moderately well-sorted, subrounded, fine- to medium-grained quartzite, and sublitharenite with interbedded shaley rocks. Estimates of sandstone clast composition indicate greater than 90 percent quartz (rare light-blue color), two to five percent chert, and locally trace amounts of feldspar and white mica. |
| KJws | Wolverine quartzite unit sandstone and shale-undivided (Early Cretaceous and Late Jurassic: Weber and others, 1992)-Medium gray to light gray, locally black, lichen-covered, quartz-rich sandstone and interbedded shale. Sandstone is silica-cemented, well-indurated quartzarenite but lacks the prominent outcrop pattern, continuity, and thickness of the quartzite unit (map unit "KJwq"). |
| TrPs | ***Note: typographical error exists on the Preliminary Interpretive Geologic Bedrock Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37B-SH1). Unit TrPa does not exist. Unit label should read TrPs.*** Argillite, sandstone and shale (Triassic and Permian: Reifenstuhl and others, 1997a)-Dark gray to very dark gray, typically fine to very fine grained, argillaceous siliciclastic rocks,with common orange-brown weathering surfaces. Rocks have a better developed low-grade metamorphic fabric (phyllitic) compared to the Cretaceous to Jurassic age sandstone and shale lithologies above (map units "KJwq", "KJws"). |
| TrPp | Conglomerate (Triassic and Permian: Reifenstuhl and others, 1997a)-Very dark gray, orange-brown-weathering, matrix-supported, chert-pebble to cobble conglomerate. Matrix is dark gray argillite to very fine sand, and clasts are sub-rounded pebble to cobble size. |
| Mg | Globe quartzite unit (Mississippian: Weber and others, 1992; Mortensen and Thompson, 1990)-Light gray, light- to medium-gray weathering and iron-stained, fine to medium-grained, bimodal to moderately sorted, distinctive vitreous quartzite, with interbedded medium to dark gray slate, phyllite, and shaley rocks. Framework grains are well rounded to subrounded monocrystalline quartz, and minor chert clasts. |
| Dl | Devonian limestone fault slivers at Granite Creek [Famennian (late Late Devonian): this report]-Dark gray, light gray-weathering, lime mudstone. Uppermost strata of the largest fault sliver include abundant floating quartz grains up to 3 mm in diameter, which are increasingly abundant down-section. |
| Dc | Conglomerate (Late Devonian?: this report)-Dark gray to very dark gray, brown-weathering, clast-supported, chert-pebble to cobble conglomerate; matrix consists of siliciclastic and carbonate material, and clasts are sub-rounded pebble to cobble size. |
| Pzlca | Chert and cherty argillite (Ordovician)-Heterogeneous unit composed dominantly of light gray to gray, thinly laminated, recrystallized sericitic chert and siliceous argillite, commonly with phyllitic argillite partings; "cherty argillite" typically has cherty or mylonitic aspect on weathered surfaces, but fine-grained elastic or recrystallized texture on fresh surfaces. |
| Pzlv | Volcanic unit (Ordovician)-Greenish-gray, chloritic and feldspathic rocks and greenstone. Protolith of volcanic rocks is volcaniclastic, tuffaceous, and flow rocks of basaltic to intermediate composition. Some rocks are diabasic and may be meta-intrusive rocks; the number of metavolcanic layers is uncertain. |
| Pzlo | Orum limestone (Middle Ordovician to Neoproterozoic: informal name, Hopkins and Taber, unpublished manuscript)-Light to medium gray, tan to reddish brown-weathering, extensively recrystallized, typically thin- to medium-bedded lime mudstone. Unit is locally thick-bedded, and locally includes ooid grainstones and cryptalgal lamination. |
| Ofc | Fossil Creek volcanics (Late to Early Ordovician: Weber and others, 1992)-Heterogeneous assemblage of basalt, agglomerate, volcaniclastic conglomerate, lime wackestone, calcareous feldspathic sandstone, shale, siltstone, chert, slate, and phyllite. |
| PzPad | Dolostone and limestone-White to light gray, massive-bedded, locally laminated, siliceous dolostone and medium gray to dark gray lime mudstone, in approximately equal amounts. Dolostone is typically extensively silicified and characterized by box-work silica network. |
| PzPag | Greenstone-Dark greenish gray, massive to well-foliated, locally magnetic greenstone, amygdaloidal greenstone, and agglomeratic greenstone; basaltic to intermediate composition. Contains calcite amygdule fillings, locally abundant pyrite cubes, and slightly stretched volcanic and carbonate clasts up to cobble size. |
| PzPac | Cherty-argillite and chert-Heterogeneous unit of dominantly black to dark gray chert and siliceous to carbonaceous argillite with well-developed phyllitic to subphyllitic slate-like cleavage, and containing one or more dark gray limestone layers or lenses. The geochemical signature of this unit is typical of the chert in the Amy Creek unit (Haug and others, 1997) of Weber and others (1988). |
| PzPwg | Siliciclastic rock-Medium gray, tan-weathering, thin-bedded, fine-grained argillaceous sandstone, siltstone, rare greenstone (?), and phyllitic argillite. Locally, these rocks include up to 30 percent calcite that likely represents recrystallized matrix. Black, non-calcareous, carbonaceous, phyllitic argillite interbeds and partings are common. |
| Tg | Hot Springs granite pluton (58 Ma) Medium- to coarse-grained biotite granite and rare tourmaline-biotite granite. Outcrops as subdued, blocky rubble or a brown gruss. The dominant textural variety contains coarse-grained potassium feldspar (30 percent) in a matrix of medium-grained smoky quartz (30 percent), albitic plagioclase (30 percent), and slightly chloritized biotite (10 percent). |
| Kmzd | Monzodiorite- Black and white 'peppered', medium grained, subequigranular, alkalic plutonic rock lacking quartz and with more plagioclase than alkali feldspar. Mafic minerals (clinopyroxene > biotite > hornblende) commonly make up more than 50 percent of the rock. |
| JRc | Carbonatite - (approximately 200 Ma) Medium to coarse grained, dolomite-calcite-magnetite-apatite-rich rock, which weathers to a deep red gossan and is characterized by an intense magnetic high. Occurs as two steeply-dipping sills (?) up to 30 m thick, which may be a single sill or dike that is repeated by isoclinal folding. |
| Value | Definition |
|---|---|
| 0 | Hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes |
| 5 | Contact |
| Value | Definition |
|---|---|
| FZONE | Kaltag Fault Zone- Major dextral stirke-slip fault zone connecting Tintina Fault Zone. The Kaltag fault zone is topographically subdued but cuts the Amy Creek dolomite unit and the Livengood Chert unit. |
| Kwcq | Wilber Creek unit quartzite (Albian: Weber and others, 1992)-Medium gray to light gray, highly quartzitic, hard, dense, argillaceous lithic quartzite. Quartzite interbeds occur locally as abundant laminae up to 20 cm thick in the Wilber Creek unit (map unit "Kwcs") on the northern side of Manley Dome (where it is a mappable unit). |
| Kdm | Mafic dikes (95 Ma)-Very dark gray and greenish very dark gray, very fine grained hypabyssal dikes. Composition ranges from monzodiorite to monzonite, with little or no quartz, abundant clinopyroxene, and plagioclase subequal in abundance to alkali feldspar. |
| Kgs | Granite and quartz syenite-Buff to light gray, fine to coarse grained, sub-equigranular, holocrystalline rock. The rock exhibits slight hydrothermal alteration, with feldspar partly converted to fine-grained white mica. Quartz/(quartz + total feldspar) ratios vary from 15 to 35 percent, and the bulk of the feldspar appears to be K-feldspar. |
| Ksy | Syenite and quartz syenite - Black and white 'peppered', coarse to medium grained, subequigranular to trachytoid, syenite and quartz syenite. With the exception of euhedral, megacrystic, alkali feldspar, the minerals are typically subhedral and anhedral. |
| Kmo | Monzonite - Black and white 'peppered', coarse to medium grained, locally foliated, subequigranular to trachytoid, porphyritic monzonite and quartz monzonite. Mineralogy is typically subhedral and anhedral, with the exception of euhedral megacrystic alkali feldspar. |
| Pzum | Ultramafic rocks - (approximately 540 Ma) Serpentinite, gabbro, and minor roddingite, which weather to a buff-colored massive rubble. Predominantly serpentinite, consisting of fine-grained, moderately foliated to unfoliated serpentine-talc with 2 to 5 percent fine- to medium-grained magnetite, 0 to 20 percent magnesite, 0 to 25 percent altered, medium-grained orthopyroxene, 0.1 to 0.5 percent fine- to medium-grained chromite, and 0 to 1 percent fine-grained chlorite. |
| Kwcv | Wilber Creek unit siliciclastic and volcaniclastic rocks (late Albian(?): Weber and others, 1992)-Very dark gray to dark greenish dark gray, volcanic clast-bearing, poorly sorted, sub-angular, medium- to coarse-grained, marine, argillaceous lithic sandstone, shale and siltstone. Estimates of the framework grain composition are: 55 percent chert, 25 percent quartz, 15 percent plagioclase (which includes about 5 percent obvious volcanic clasts), and 5 percent sedimentary and metamorphic rock fragments, and minor white mica. |
| Kwcs | Wilber Creek unit sandstone, shale, siltstone, undivided (Albian: Weber and others, 1992)-Very dark gray to dark greenish gray, poorly sorted, marine, argillaceous lithic sandstone, shale and siltstone containing white mica-bearing argillaceous sandstone as laminae and thin interbeds; rare conglomerate. Beds are typically thin, parallel, laterally continuous, sharp-based, and graded; from fine to medium grained at the base, grading up to silt at the top of beds. |
| KJwq | Wolverine quartzite unit (Early Cretaceous and Late Jurassic: Weber and others, 1992)-Very light gray to tan, white- to medium gray-weathering, moderately well-sorted, subrounded, fine- to medium-grained quartzite, and sublitharenite with interbedded shaley rocks. Estimates of sandstone clast composition indicate greater than 90 percent quartz (rare light-blue color), two to five percent chert, and locally trace amounts of feldspar and white mica. |
| KJws | Wolverine quartzite unit sandstone and shale-undivided (Early Cretaceous and Late Jurassic: Weber and others, 1992)-Medium gray to light gray, locally black, lichen-covered, quartz-rich sandstone and interbedded shale. Sandstone is silica-cemented, well-indurated quartzarenite but lacks the prominent outcrop pattern, continuity, and thickness of the quartzite unit (map unit "KJwq"). |
| TrPs | ***Note: typographical error exists on the Preliminary Interpretive Geologic Bedrock Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37B-SH1). Unit TrPa does not exist. Unit label should read TrPs.*** Argillite, sandstone and shale (Triassic and Permian: Reifenstuhl and others, 1997a)-Dark gray to very dark gray, typically fine to very fine grained, argillaceous siliciclastic rocks,with common orange-brown weathering surfaces. Rocks have a better developed low-grade metamorphic fabric (phyllitic) compared to the Cretaceous to Jurassic age sandstone and shale lithologies above (map units "KJwq", "KJws"). |
| TrPp | Conglomerate (Triassic and Permian: Reifenstuhl and others, 1997a)-Very dark gray, orange-brown-weathering, matrix-supported, chert-pebble to cobble conglomerate. Matrix is dark gray argillite to very fine sand, and clasts are sub-rounded pebble to cobble size. |
| Dc | Conglomerate (Late Devonian?: this report)-Dark gray to very dark gray, brown-weathering, clast-supported, chert-pebble to cobble conglomerate; matrix consists of siliciclastic and carbonate material, and clasts are sub-rounded pebble to cobble size. |
| Pzlca | Chert and cherty argillite (Ordovician)-Heterogeneous unit composed dominantly of light gray to gray, thinly laminated, recrystallized sericitic chert and siliceous argillite, commonly with phyllitic argillite partings; "cherty argillite" typically has cherty or mylonitic aspect on weathered surfaces, but fine-grained elastic or recrystallized texture on fresh surfaces. |
| Pzlv | Volcanic unit (Ordovician)-Greenish-gray, chloritic and feldspathic rocks and greenstone. Protolith of volcanic rocks is volcaniclastic, tuffaceous, and flow rocks of basaltic to intermediate composition. Some rocks are diabasic and may be meta-intrusive rocks; the number of metavolcanic layers uncertain. |
| Pzlo | Orum limestone (Middle Ordovician to Neoproterozoic: informal name, Hopkins and Taber, unpublished manuscript)-Light to medium gray, tan to reddish brown-weathering, extensively recrystallized, typically thin- to medium-bedded lime mudstone. Unit is locally thick-bedded, and locally includes ooid grainstones and cryptalgal lamination. |
| PzPad | Dolostone and limestone-White to light gray, massive-bedded, locally laminated, siliceous dolostone and medium gray to dark gray lime mudstone, in approximately equal amounts. Dolostone is typically extensively silicified and characterized by box-work silica network. |
| PzPac | Cherty-argillite and chert-Heterogeneous unit of dominantly black to dark gray chert and siliceous to carbonaceous argillite with well-developed phyllitic to subphyllitic slate-like cleavage, and containing one or more dark gray limestone layers or lenses. The geochemical signature of this unit is typical of the chert in the Amy Creek unit (Haug and others, 1997) of Weber and others (1988). |
| Tg | Hot Springs granite pluton (58 Ma&Medium- to coarse-grained biotite granite and rare tourmaline-biotite granite. Outcrops as subdued, blocky rubble or a brown gruss. The dominant textural variety contains coarse-grained potassium feldspar (30 percent) in a matrix of medium-grained smoky quartz (30 percent), albitic plagioclase (30 percent), and slightly chloritized biotite (10 percent). |
| Kmzd | Monzodiorite- Black and white 'peppered', medium grained, subequigranular, alkalic plutonic rock lacking quartz and with more plagioclase than alkali feldspar. Mafic minerals (clinopyroxene > biotite > hornblende) commonly make up more than 50 percent of the rock. |
| JRc | Carbonatite - (approximately 200 Ma) Medium to coarse grained, dolomite-calcite-magnetite-apatite-rich rock, which weathers to a deep red gossan and is characterized by an intense magnetic high. Occurs as two steeply-dipping sills (?) up to 30 m thick, which may be a single sill or dike that is repeated by isoclinal folding. |
| Value | Definition |
|---|---|
| HFELS | Hornfels near intrusions are very dark gray to black, very fine to fine grained, hard, dense rocks with common disoriented crystals or rosettes of muscovite, biotite, and locally andalusite. Typically formed by contact metamorphism. |
| Value | Definition |
|---|---|
| NM | Not mapped, region is irrelevant and not meaningful for the particular data layer |
| HFELS | Hornfels near intrusions are very dark gray to black, very fine to fine grained, hard, dense rocks with common disoriented crystals or rosettes of muscovite, biotite, and locally andalusite. Typically formed by contact metamorphism. |
| Value | Definition |
|---|---|
| 11 | Fault. ***Note: arcs having the software-defined attribute/column FID whose values are between 140-142 represent the Stevens Creek Fault (continued in Entity_Attribute_Layer "tana2str" listed below). The annotation "Stevens Creek Fault", as seen on the Preliminary Interpretive Geologic Bedrock Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37B-SH1), is not preserved in the structure coverage.*** |
| 12 | Fault approximately located |
| 17 | Thrust fault, sawteeth on upper plate, user will need to see the Preliminary Interpretive Geologic Bedrock Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37B-SH1) for interpretation of relative plate motion |
| 18 | Thrust fault, approximately located, user will need to see the Preliminary Interpretive Geologic Bedrock Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37B-SH1) for interpretation of relative plate motion |
| 20 | Thrust fault, probable, user will need to see the Preliminary Interpretive Geologic Bedrock Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37B-SH1) for interpretation of relative plate motion |
| Value | Definition |
|---|---|
| 11 | Fault. ***Note: arcs having the software-defined attribute/column FID whose values are between 37-48, 54-58, 61, and 62 represent the Stevens Creek Fault (continued from the Entity_Attribute_Layer "tana1str" listed above). The annotation "Stevens Creek Fault", as seen on the Preliminary Interpretive Geologic Bedrock Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37B-SH1), is not preserved in the structure coverage.*** |
| 12 | Fault approximately located |
| 17 | Thrust fault, sawteeth on upper plate, user will need to see the Preliminary Interpretive Geologic Bedrock Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37B-SH1) for interpretation of relative plate motion |
| 18 | Thrust fault, approximately located, user will need to see the Preliminary Interpretive Geologic Bedrock Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37B-SH1) for interpretation of relative plate motion |
| 20 | Thrust fault, probable, user will need to see the Preliminary Interpretive Geologic Bedrock Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37B-SH1) for interpretation of relative plate motion |
| Value | Definition |
|---|---|
| 4 | Generic line depicting a type of fold, anticline, syncline, or cross-section location. This line, in combination with the proper point symbol, indicates the location of an anticline or syncline (see Entity_Type_Label "tana1fld.pat" below). |
| 36 | Inferred anticline or syncline. This line, in combination with the proper point symbol, indicates the location of an anticline or syncline (see Entity_Type_Label "tana1fld.pat" below). |
"Yes"- The line represents a cross-section. "No"- The line does not represent a cross-section.
| Value | Definition |
|---|---|
| 22 | Anticline |
| 23 | Syncline |
| 27 | Overturned anticline, showing direction of dip of limbs |
| Value | Definition |
|---|---|
| 4 | Generic line depicting a type of fold, anticline, syncline, or cross-section location. This line, in combination with the proper point symbol, indicates the location of an anticline or syncline (see Entity_Type_Label "tana2fld.pat" below). |
| 34 | Fold axis. This line, in combination with the proper point symbol, indicates the location of an anticline or syncline (see Entity_Type_Label "tana2fld.pat" below). |
| 36 | Inferred anticline or syncline. This line, in combination with the proper point symbol, indicates the location of an anticline or syncline (see Entity_Type_Label "tana2fld.pat" below). |
"Yes"- The line represents a cross-section. "No"- The line does not represent a cross-section.
| Value | Definition |
|---|---|
| 22 | Anticline |
| 23 | Syncline |
| 26 | Overturned syncline, showing direction of dip of limbs |
| Value | Definition |
|---|---|
| 0 | Hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes |
| 64 | Buried anomaly, boundary of airborne geophysical signature: high magnetics and low resistivity |
| Value | Definition |
|---|---|
| 0 | Hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes |
| 64 | Buried anomaly, boundary of airborne geophysical signature: high magnetics and low resistivity |
| 65 | Buried anomaly, boundary of airborne geophysical signature: low magnetics and high resistivity |
Unique sample number designated by the author(s).
| Value | Definition |
|---|---|
| 1 | Strike and dip direction of beds |
| 3 | Strike and dip direction of beds, top of beds known from sedimentary features |
| 4 | Strike and dip direction of overturned beds |
| 5 | Strike of vertical beds, stratigraphic tops to north |
| 7 | Bearing of plunge of lineation |
| 9 | Strike and dip direction of foliation |
| 12 | Strike and dip direction of cleavage |
| 13 | Strike of vertical cleavage |
| 19 | Strike and dip direction of joints |
| 20 | Strike of vertical joints |
| Range of values | |
|---|---|
| Minimum: | 3 |
| Maximum: | 360 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 10 |
| Maximum: | 90 |
| Units: | degrees |
"Yes"- The point is printed or shown on the Preliminary Interpretive Geologic Bedrock Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37B-SH1). "No"- The point is not printed or shown on the Preliminary Interpretive Geologic Bedrock Map of the Tanana A-1 and A-2 Quadrangles, Central Alaska (Publication PDF98-37B-SH1). A value of "No" may indicate that a duplicate value was measured nearby or the point was simply omitted at the discretion of the author(s).
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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(907) 451-5050 (FAX)
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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.
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:
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, 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:
Location data for geologic point data were entered manually from GPS units into a spreadsheet. 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. See "Source_Information" section for horizontal positional accuracy of locations not measured by DGGS.
This dataset includes geospatial information about geologic units, their age, and field sample locations, structural features, structural measurements, and geology interpreted from airborne geophysics.
Polygon topology present and clean on appropriate data. Other data are line, point, or annotation data and do not require topologic relationships.
Are there legal restrictions on access or use of the data?
- Access_Constraints:
- This report, map, and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
- Use_Constraints:
- Any hard copies or published datasets utilizing these datasets 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 datasets, 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.
907-451-5020 (voice)
907-451-5050 (FAX)
dggspubs@alaska.gov
Public Data File 98-37B v 1.1
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| Data format: | PDF (version 1.6) |
|---|---|
| Network links: |
<http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=1864> |
| Data format: | ArcGIS Shapefile (version ESRI ArcGIS 9.x) |
|---|---|
| Network links: |
<http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=1864> |
| Media you can order: |
CD-ROM
(format Joliet)
|
Digital files on CD-ROM are available for $10.00 (contact information below). No fees charged for downloaded files.
Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). The DGGS web site (<http://www.dggs.dnr.state.ak.us/>) has a list of electronic data available and an order form that can be printed. Payment accepted: Cash, check, money order, VISA, or MasterCard.
Digital downloads: less than 30 minutes for most files. Offline CD/DVD-ROMs: 1-2 weeks unless special arrangements are made and an express fee is paid.
Please check the MapInfo web site (<http://www.mapinfo.com/>) for the latest documentation on importing ESRI shape files.
907-451-5039 (voice)
907-451-5050 (FAX)
dggspubs@alaska.gov