tanb1_fold4_arc geologic structural fold lines, anticlines, or synclines tanb1_fold4_point point symbols for structural fold lines, anticlines, or synclines tanb1_form4_arc geologic structural form lines tanb1_geo3_arc geologic bedrock units (arc) tanb1_geo3_polygon geologic bedrock units (polygons) tanb1_lines3_arc lines depicting cross-sections tanb1_str4_arc geologic structure lines tanb1att2_point strike, dip, and plunge of bedding planes, foliation, and various lineaments
Reifenstuhl, R.R., Dover, J.H., Newberry, R.J., Clautice, K.H., Liss, S.A., Blodgett, R.B., Bundtzen, T.K., and Weber, F.R., 1997, Interpretive geologic bedrock map of the Tanana B-1 Quadrangle, Central Alaska: Report of Investigation RI 97-15B, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, 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 |
| 1 | Neatline for small scale maps, in this case used for contact boundaries |
| 6 | Contact, approximately located |
| Value | Definition |
|---|---|
| FZONE | Victoria Creek Fault- Major dextral strike-slip fault zone connecting Tintina Fault Zone. The Victoria Creek fault zone is topographically subdued but cuts the Amy Creek dolomite unit and the Livengood Chert unit. Also called the Kaltag fault or the Tozitna fault. |
| RIV | River- Yukon River |
| Ts? | Unit Ts, questionable |
| Formal codeset | |
|---|---|
| Codeset Name: | RI1997-15_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys <http://www.dggs.dnr.state.ak.us/metadata/RI1997-15_codeset.pdf> |
| Value | Definition |
|---|---|
| NM | Not mapped, region is irrelevant and not meaningful for the particular data layer |
| Formal codeset | |
|---|---|
| Codeset Name: | RI1997-15_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys <http://www.dggs.dnr.state.ak.us/metadata/RI1997-15_codeset.pdf> |
| Value | Definition |
|---|---|
| T | Denotes a geologic unit polygon of Triassic age. This attribute was added to help remind the authors/cartographers that a special font was needed for the "Tr" (Triassic symbol) during final layout formatting. Some polygons may not have been assigned a value of "T". |
| z | Denotes a geologic unit polygon not of Triassic age. This attribute was added to help remind the authors/cartographers that a special font was needed for the "Tr" (Triassic symbol) during final layout formatting (see above). Some polygons may not have been assigned a value of "z". |
"Y"- The geologic polygon shown on the Interpretive Geologic Bedrock Map of the Tanana B-1 Quadrangle, Central Alaska (Publication RI-97-15B-SH1) is classified as a region having a hornfelsic texture. "N"- The geologic polygon shown on the Interpretive Geologic Bedrock Map of the Tanana B-1 Quadrangle, Central Alaska (Publication RI-97-15B-SH1) is not classified as a region having a hornfelsic texture. Some polygons may not have been assigned a value of "Y" or "N".
| Value | Definition |
|---|---|
| 0 | Hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes |
| 5 | Contact |
| 6 | Contact, approximately located |
| 11 | Fault. *** Note: arcs having the software-defined attribute/column FID whose values are "9, 24, 25, 32, 74, 139, 160, 161, 166, 167, 172, 173, 183, 184, 241, 242, 298, 368, 398, 399, 464, 465, and 468-473" represent the Victoria Creek Fault. The annotation "Victoria Creek Fault", as seen on the Interpretive Geologic Bedrock Map of the Tanana B-1 Quadrangle, Central Alaska (Publication RI-97-15B-SH1), is not preserved in the structure data. *** |
| 13 | Fault, inferred |
| 17 | Thrust fault, sawteeth on upper plate, user will need to see the Interpretive Geologic Bedrock Map of the Tanana B-1 Quadrangle, Central Alaska (Publication RI 97-15B-SH1) for interpretation of relative plate motion |
| 19 | Thrust fault, inferred, user will need to see the Interpretive Geologic Bedrock Map of the Tanana B-1 Quadrangle, Central Alaska (Publication RI 97-15B-SH1) for interpretation of relative plate motion |
| Value | Definition |
|---|---|
| 0 | *** Note: A code value of "0" does not actually exist for this particular feature. The correct code value for the software-defined attribute/column FID whose values are 429 and 443 should be "6" (see below). *** |
| 6 | Fault. |
| 7 | Fault, inferred. |
| 8 | Thrust fault, sawteeth on upper plate, user will need to see the Interpretive Geologic Bedrock Map of the Tanana B-1 Quadrangle, Central Alaska (Publication RI 97-15B-SH1) for interpretation of relative plate motion. |
| 9 | Thrust fault, inferred, user will need to see the Interpretive Geologic Bedrock Map of the Tanana B-1 Quadrangle, Central Alaska (Publication RI 97-15B-SH1) for interpretation of relative plate motion. |
| Value | Definition |
|---|---|
| 19 | Bedding trace- Approximate trace of bedding on topographic surface, showing stratigraphic or structural "form" |
| Value | Definition |
|---|---|
| 7 | *** Note: The "SYMBOL" value of "7" listed is incorrect. The correct value should be "9", which is defined as a concealed contact, in this case depicting a bedding trace. *** |
| Value | Definition |
|---|---|
| 19 | *** Note: The "SYMBOL" value of "19" listed is incorrect. The correct value should be "36", which is defined as an inferred anticline or syncline. *** |
| 34 | Fold axis, anticline or syncline. This line, in combination with the proper point symbol, indicates the location of an anticline or syncline (see Entity_Type_Label "tanb1.fold4.pat" below). |
| 35 | Anticline or syncline, approximately located. This line, in combination with the proper point symbol, indicates the location of an anticline or syncline (see Entity_Type_Label "tanb1.fold4.pat" below). |
| 36 | Anticline or syncline, inferred. This line, in combination with the proper point symbol, indicates the location of an anticline or syncline (see Entity_Type_Label "tanb1.fold4.pat" below). |
| 37 | Anticline or syncline, probable. This line, in combination with the proper point symbol, indicates the location of an anticline or syncline (see Entity_Type_Label "tanb1.fold4.pat" below). |
| 38 | Anticline or syncline, concealed. This line, in combination with the proper point symbol, indicates the location of an anticline or syncline (see Entity_Type_Label "tanb1.fold4.pat" below). |
| Value | Definition |
|---|---|
| 0 | Hidden line |
| 11 | Anticline or syncline, approximately located. |
| 12 | Anticline or syncline, inferred. |
| Value | Definition |
|---|---|
| 22 | Anticline |
| 23 | Syncline |
| 26 | Overturned syncline, showing direction of dip of limbs |
| 27 | Overturned anticline, showing direction of dip of limbs |
| Value | Definition |
|---|---|
| 5 | Contact, in this case a generic line depicting a cross-section location |
| Range of values | |
|---|---|
| Minimum: | -150.4976 |
| Maximum: | -150.0005 |
| Units: | decimal degrees |
| Range of values | |
|---|---|
| Minimum: | 65.2506 |
| Maximum: | 65.491 |
| Units: | decimal degrees |
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 |
| 8 | Horizontal beds |
| 9 | Strike and dip direction of foliation |
| 10 | Strike of vertical foliation (relationship of foliation or schistocity to bedding not shown in outcrop) |
| 11 | Horizontal 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: | 5 |
| Maximum: | 360 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 90 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 616665.6 |
| Maximum: | 640062.8 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 7238733 |
| Maximum: | 7265926 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 90 |
| Units: | degrees |
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 1474-HQ-96-AG (June 1996 through May 1997) and by the Alaska State Legislature.
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The Tanana B-1 quadrangle lies between the villages of Rampart, on the Yukon River, and Manley Hot Springs, at the terminus of the Elliot Highway. At the time this project 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 continued mineral exploitation that will economically benefit the region's inhabitants and the State of Alaska. This publication also identifies sources of construction materials and evaluates the type and severity of geologic constraints to future development in the region.
Eakin, H.M., 1912, The Rampart and Hot Springs regions: U.S. Geological Survey Bulletin Bulletin 520, U.S. Geological Survey, Reston, VA, USA.Online Links:
U.S. Geological Survey Staff, 1912, Mineral resources of Alaska, report on progress of investigations of 1911: 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.Online Links:
Hopkins, D.M., and Taber, B., 1962, Asymmetrical valleys in central Alaska (abs.): Special Paper v. 68, Geological Society of America, Boulder, CO, USA.Online Links:
- NONE
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.Online Links:
- NONE
Yeend, W., 1990, 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.Online Links:
Data sources used in this process:
Reifenstuhl, R.R., Dover, J.H., Pinney, D.S., Newberry, R.J., Clautice, K.H., Liss, S.A., Blodgett, R.B., Bundtzen, T.K., and Weber, F.R., 1997, Geologic map of the Tanana B-1 quadrangle, central Alaska: Report of Investigation RI 97-15A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), Fairbanks, AK, USA.Online Links:
Pinney, D.S., 1997, Surficial geologic map of the Tanana B-1 Quadrangle, central Alaska: Report of Investigation RI 97-15C, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
Pinney, D.S., 1997, Derivative geologic materials map of the Tanana B-1 Quadrangle, central Alaska: Report of Investigation RI 97-15D, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
Pinney, D.S., 1997, Derivative map of potential geologic hazards in the Tanana B-1 Quadrangle, Alaska: Report of Investigation RI 97-15E, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
Locations for geologic and comprehensive 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 and their ages; field sample locations; structural 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.
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.
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Report of Investigation 97-15B
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Current publication is available on paper. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard.
Printed publication can be purchased for $14.50 (contact information below) plus shipping if mailed.
| Data format: | PDF (version 1.6) |
|---|---|
| Network links: |
<http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2552> |
| Data format: | ArcGIS Shapefile (version ESRI ArcGIS 9.x) |
|---|---|
| Network links: |
<http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2552> |
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