bdgeo3_polygon bedrock geologic unit polygons samples_point sample locations
Reger, R.D., and Péwé, T.L., 2002, Geologic map of the Big Delta A-4 Quadrangle, Alaska: Report of Investigation RI 2002-2, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.
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 6378206.4.
The flattening of the ellipsoid used is 1/294.978698.
|Qaa||ACTIVE-FLOODPLAIN ALLUVIUM—Chiefly well-sorted and well-stratified layers and lenses of silt, sand, and polymictic gravel (pebbles and cobbles) comprising river bars subject to frequent inundations by streams|
|Qai||INACTIVE-FLOODPLAIN ALLUVIUM—Chiefly 10 to 20 ft of overbank silty sand and sandy silt overlying gravelly, polymictic riverbed sand and sandy gravel beneath surfaces subject to stream flooding at least as often as once or twice every century (Mason and Begét, 1991); may include more than one surface;|
|Qab||ABANDONED-FLOODPLAIN ALLUVIUM—Chiefly 10 to 20 ft of overbank sandy silt and silty sand overlying sandy, polymictic riverbed gravel beneath surfaces with widespread lowland loess and local sand dunes and subject to stream flooding about once every 500 to 1,000 years;|
|Qao||UNDIFFERENTIATED GLACIAL AND NONGLACIAL ALLUVIUM—Primarily coarse, polymictic gravel and sand deposited by former proglacial streams of the Delta glaciation and locally covered along courses of nonglacial streams by postglacial alluvium;|
|Qat||STREAM-TERRACE ALLUVIUM—Chiefly 4 to more than 20 ft of organic sandy silt and silty sand overlying well-sorted, polymictic sand and gravel beneath stream terrace treads no longer subject to inundations by the stream that deposited the alluvium;|
|Qcf||MIXED COLLUVIUM AND ALLUVIAL DEPOSITS—Primarily fan-shaped, massive to poorly stratified fine material mixed with polymictic pebble and cobble gravel laid down by small, ephemeral streams draining glacial and eolian-cover deposits;|
|Qel||LOESS—Silt with up to 15 percent very fine sand carried by winds and deposited as a blanket over the downwind topography|
|Qer||RETRANSPORTED LOESS AND LOWLAND SILT—Chiefly organic silt with variable amounts of sand and lenses of locally derived gravel that are deposited by slope runoff and seasonal streams draining bedrock slopes covered by upland silt;|
|Qes||DUNE SAND—Chiefly fine eolian sand with trace amounts (2 to 16 percent) of silt;|
|Qgdo||TILL AND ASSOCIATED MORAINAL DEPOSITS OF DELTA GLACIATION—Heterogeneous, nonstratified, polymictic pebble–cobble gravel with some sand and silt and few to numerous subangular to subrounded boulders deposited by glacial ice;|
|Qgfo||OUTWASH OF DELTA GLACIATION|
|Qgfy||OUTWASH OF DONNELLY GLACIATION|
|Qlr||DEPOSITS OF ICE-SHOVED RAMPARTS—Chiefly well-sorted and complexly deformed polymictic pebble–cobble gravel with some medium to coarse sand pushed into a system of double 3- to 5-ft-high ridges around the northwestern margin of Quartz Lake by wind-driven;|
|Qp||SWAMP DEPOSIT—Primarily fibrous and locally woody autochthonous peat with organic silt and sand deposited in lowland sites (Kreig and Reger, 1982); up to 8 ft thick; discontinuously to continuously frozen with moderate to high ice content;|
|Pzs||QUARTZITE AND SCHIST—Chiefly quartzite with common quartz–mica schist and lesser feldspathic quartzite; generally garnetiferous, locally actinolitic and gneissic;|
|PzpCa||AUGEN GNEISS AND BIOTITE GNEISS—Chiefly medium- to coarse-grained, foliated and typically mylonitic augen gneiss with subordinate augen schist and biotite gneiss of amphibolite metamorphic facies in bedrock uplands of southern Yukon–Tanana terrane;|
|PzpCg||QUARTZ–BIOTITE GNEISS—Medium-grained, well-foliated and banded to massive gneiss interbedded with quartzite in bedrock uplands of the southern Yukon–Tanana terrane;|
Value assigned 1, 2, 3
(907) 451-5029 (voice)
(907) 451-5050 (FAX)
This publication provides geological information on the Delta Junction and Big Delta area for resource evaluation and geological hazards.
Are there legal restrictions on access or use of the data?
- 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.
Report of Investigation 2002-2
The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.
Current publication is available on paper. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (email@example.com), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard.
Printed publication can be purchased for $13.00 (contact information below) plus shipping if mailed.
|Data format:||PDF (version 1.6)|
|Data format:||ArcGIS Shapefile (version ESRI ArcGIS 9.x)|
|Media you can order:||
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 (firstname.lastname@example.org), or fax (907-451-5050). The DGGS web site (<http://www.dggs.alaska.gov/>) 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.