This geologic map is a compilation of published and unpublished geologic mapping and information derived from other published and unpublished sources. Published geologic maps at scales of 1:250,000, 1:63,360, and 1:50,000 were major sources and range in publication date from 1972 to 2005. More detailed studies, including theses, papers, and unpublished mapping, represent work done between 1980 and 2008.
This data set is a portion of a statewide geology database, which is being compiled by the U.S. Geological Survey's National Surveys and Analysis (NSA) project, whose goal is to compile geologic, geochemical, geophysical, and other data.
Labay, Keith A., Bleick, Heather A., Wilson, Frederic H., and Shew, Nora, 2010, Digital data for the Preliminary Bedrock Geologic Map of the Seward Peninsula, Alaska, and Accompanying Conodont Data: U.S. Geological Survey Open-File Report OFR 2009-1254.This is part of the following larger work.Online Links:
Till, Alison B., Dumoulin, Julie A., Werdon, Melanie B., and Bleick, Heather A., 2010, Preliminary bedrock geologic map of the Seward Peninsula, Alaska, and accompanying conodont data: U.S. Geological Survey Open-File Report OFR 2009-1254.
This is a Vector data set.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000256
Ordinates (y-coordinates) are specified to the nearest 0.000256
Planar coordinates are specified in meters
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.9787.
NOTE: Because of the limitations of common GIS fonts, the letters "Mz", "Pz", "C", and "Z" are substituted for the standard symbols for "Mesozoic", "Paleozoic", "Cambrian", and "Proterozic". (Source: this data set)
| Value | Definition |
|---|---|
| Cd | Dolostone (Cambrian) |
| DCbm | Black marble (Devonian to Cambrian) |
| DCks | Calcareous schist of Kwiniuk Mountain (Devonian to Cambrian) |
| DObm | Black metalimestone and marble (Devonian to Ordovician) |
| DOx | Mixed marble, graphitic metasiliceous rock, and schist (Devonian to Ordovician) |
| DSl | Limestone (Devonian and (or) Silurian) |
| Dcs | Pelitic, calcareous, and graphitic schist (Devonian) |
| Ddm | Dolostone, metalimestone, and marble (Devonian) |
| Df | Felsic schist (Devonian) |
| Dg | Granitic orthogneiss (Devonian) |
| Ds | Pelitic schist (Devonian?) |
| Jt | Spruce Creek tonalite (Jurassic) |
| Kbk | Bendeleben and Kuzitrin plutons (Cretaceous) |
| Kkd | Diorite (Cretaceous) |
| Kd | Darby pluton (Cretaceous) |
| Kdc | Dry Canyon stock (Early Cretaceous) |
| Kdi | Kigluaik diorite (Cretaceous) |
| Kg | Kigluaik granite (Cretaceous) |
| Kgr | Granite and granodiorite (Early Cretaceous) |
| Kgu | Granitic rocks, undifferentiated (Cretaceous) |
| Kkg | Granodiorite (Cretaceous) |
| Kkgm | Gneissic monzonite (Cretaceous) |
| Kkms | Monzonite-syenite (Cretaceous) |
| Kku | Kugruk pluton (Cretaceous) |
| Kp | Pargon pluton (Cretaceous) |
| Ks | Stocks, undifferentiated (Cretaceous) |
| Ksy | Syenite, monzonite, and nepheline syenite (Early Cretaceous) |
| Ktg | Tin-bearing granitic stocks (Late Cretaceous) |
| Kv | Andesite and basalt flows and volcaniclastic rocks (Early Cretaceous) |
| Kwc | Windy Creek pluton (Cretaceous) |
| Ml | Limestone, dolomitic limestone, and marble (Mississippian) |
| MzPzm | Metamorphosed mafic rocks and serpentinite (Mesozoic and Paleozoic?) |
| OZl | Limestone and dolomitic limestone (Ordovician to Proterozoic) |
| OZp | Phyllite (Ordovician to Proterozoic) |
| OZt | Sandstone, siltstone, and limestone (Ordovician to Proterozoic) |
| Oal | Argillaceous limestone and limestone (Ordovician) |
| Ocs | Casadepaga Schist (Ordovician) |
| Od | Dolostone (Ordovician) |
| Oim | Impure chlorite marble (Ordovician) |
| Ol | Limestone (Ordovician) |
| Ols | Limestone and shale (Ordovician) |
| PzZg | Gneiss and orthogneiss (Paleozoic? and Proterozoic?) |
| PzZh | High-grade metasedimentary and metaigneous rocks (Paleozoic and Proterozoic) |
| PzZl | Metalimestone (Paleozoic and Proterozoic?) |
| PzZm | Marble (Paleozoic to Proterozoic?) |
| PzZt | Metasiltstone and phyllite (Paleozoic and Proterozoic?) |
| Pzd | Dolostone, undivided (Paleozoic) |
| Pzgb | Metagabbro (Paleozoic) |
| Pzl | Limestone (Paleozoic) |
| Pzm | Marble, undivided (Paleozoic) |
| Pzmm | Marble of the Moon Mountains (Paleozoic) |
| Pznp | Metagabbro and metasediments (Paleozoic?) |
| Pzp | Phyllite and argillite (Paleozoic) |
| QTv | Weathered volcanic rocks, undivided (Quaternary and Tertiary) |
| Qlj | Lost Jim Basalt (Holocene) |
| Qs | Surficial deposits, undivided (Quaternary) |
| SOdl | Dark limestone (Silurian and Upper Ordovician) |
| SOul | Limestone and dolostone, undifferentiated (Silurian and Ordovician) |
| Sd | Dolostone (Silurian) |
| TKs | Carbonate-rich conglomerate and sandstone; mudstone, siltstone and coal (Tertiary and Cretaceous) |
| TKv | Felsic volcanic rocks (Tertiary and Cretaceous) |
| Zn | Metagranitic rocks (Late Proterozoic) |
| Zo | Orthogneiss (Proterozoic) |
| Zv | Metavolcanic rocks (Proterozoic) |
Supplemental attribute tables included with this data set contain additional descriptive information of each geologic unit. A user may use items SOURCE and CLASS to retrieve information about the original units from which these generalized units were formed.
NOTE: Because of the limitations of common GIS fonts, the letters "Mz", "Pz", "C", and "Z" are substituted for the standard symbols for "Mesozoic", "Paleozoic", "Cambrian", and "Proterozic". (Source: this data set)
| Value | Definition |
|---|---|
| 102 | water |
| 50000 | Cd - Dolostone (Cambrian) |
| 50001 | Qs - Surficial deposits, undivided (Quaternary) |
| 50002 | DCbm - Black marble (Devonian to Cambrian) |
| 50003 | Qlj - Lost Jim Basalt (Holocene) |
| 50004 | Ddm - Dolostone, metalimestone, and marble (Devonian) |
| 50005 | DSl - Limestone (Devonian and (or) Silurian) |
| 50006 | DOx - Mixed marble, graphitic metasiliceous rock, and schist (Devonian to Ordovician) |
| 50007 | DOx (overlay) - Mixed marble, graphitic metasiliceous rock, and schist (Devonian to Ordovician) |
| 50008 | Ds - Pelitic schist (Devonian?) |
| 50009 | Dcs - Pelitic, calcareous, and graphitic schist (Devonian) |
| 50010 | Pzgb - Metagabbro (Paleozoic) |
| 50011 | Kbk - Bendeleben and Kuzitrin plutons (Cretaceous) |
| 50012 | QTv - Weathered volcanic rocks, undivided (Quaternary and Tertiary) |
| 50013 | TKs - Carbonate-rich conglomerate and sandstone; mudstone, siltstone and coal (Tertiary and Cretaceous) |
| 50014 | TKv - Felsic volcanic rocks (Tertiary and Cretaceous) |
| 50015 | Kg - Kigluaik granite (Cretaceous) |
| 50016 | Kv - Andesite and basalt flows and volcaniclastic rocks (Early Cretaceous) |
| 50017 | Kgu - Granitic rocks, undifferentiated (Cretaceous) |
| 50018 | Kgr - Granite and granodiorite (Early Cretaceous) |
| 50019 | Kd - Darby pluton (Cretaceous) |
| 50020 | Kkg - Granodiorite (Cretaceous) |
| 50021 | Kkd - Diorite (Cretaceous) |
| 50022 | Ks - Stocks, undifferentiated (Cretaceous) |
| 50024 | Ktg - Tin-bearing granitic stocks (Late Cretaceous) |
| 50025 | Kwc - Windy Creek pluton (Cretaceous) |
| 50026 | Ml - Limestone, dolomitic limestone, and marble (Mississippian) |
| 50027 | MzPzm - Metamorphosed mafic rocks and serpentinite (Mesozoic and Paleozoic?) |
| 50028 | Kkgm - Gneissic monzonite (Cretaceous) |
| 50029 | Jt - Spruce Creek tonalite (Jurassic) |
| 50030 | Oal - Argillaceous limestone and limestone (Ordovician) |
| 50032 | Pzl - Limestone (Paleozoic) |
| 50034 | DCks - Calcareous schist of Kwiniuk Mountain (Devonian to Cambrian) |
| 50035 | Ol - Limestone (Ordovician) |
| 50036 | Ols - Limestone and shale (Ordovician) |
| 50037 | OZl - Limestone and dolomitic limestone (Ordovician to Proterozoic) |
| 50038 | OZp - Phyllite (Ordovician to Proterozoic) |
| 50039 | OZt - Sandstone, siltstone, and limestone (Ordovician to Proterozoic) |
| 50040 | SOul - Limestone and dolostone, undifferentiated (Silurian and Ordovician) |
| 50041 | Pzd - Dolostone, undivided (Paleozoic) |
| 50042 | Od - Dolostone (Ordovician) |
| 50043 | Oim - Impure chlorite marble (Ordovician) |
| 50044 | PzZl - Metalimestone (Paleozoic and Proterozoic?) |
| 50045 | Pzm - Marble, undivided (Paleozoic) |
| 50046 | Pzmm - Marble of the Moon Mountains (Paleozoic) |
| 50047 | Pzp - Phyllite and argillite (Paleozoic) |
| 50048 | Pznp - Metagabbro and metasediments (Paleozoic?) |
| 50049 | Df - Felsic schist (Devonian) |
| 50050 | PzZh - High-grade metasedimentary and metaigneous rocks (Paleozoic and Proterozoic) |
| 50051 | PzZm - Marble (Paleozoic to Proterozoic?) |
| 50052 | PzZt - Metasiltstone and phyllite (Paleozoic and Proterozoic?) |
| 50053 | Ocs - Casadepaga Schist (Ordovician) |
| 50054 | Ksy - Syenite, monzonite, and nepheline syenite (Early Cretaceous) |
| 50058 | Sd - Dolostone (Silurian) |
| 50059 | SOdl - Dark limestone (Silurian and Upper Ordovician) |
| 50064 | Zn - Metagranitic rocks (Late Proterozoic) |
| 50065 | Zo - Orthogneiss (Proterozoic) |
| 50066 | Kdi - Kigluaik diorite (Cretaceous) |
| 50067 | Zv - Metavolcanic rocks (Proterozoic) |
| 50068 | PzZg - Gneiss and orthogneiss (Paleozoic? and Proterozoic?) |
| 50069 | Dg - Granitic orthogneiss (Devonian) |
| 50070 | DObm - Black metalimestone and marble (Devonian to Ordovician) |
| 50071 | Kkms - Monzonite-syenite (Cretaceous) |
| 50072 | Kdc - Dry Canyon stock (Early Cretaceous) |
| 50073 | Kku - Kugruk pluton (Cretaceous) |
| 50074 | Kp - Pargon pluton (Cretaceous) |
NOTE: Because of the limitations of common GIS fonts, the letters "Mz", "Pz", "C", and "Z" are substituted for the standard symbols for "Mesozoic", "Paleozoic", "Cambrian", and "Proterozic". (Source: this data set)
| Value | Definition |
|---|---|
| 100 | Qs - Surficial deposits, undifferentiated |
| 102 | water - Water (streams, lakes, ocean) |
| 305 | Qhv - Holocene volcanic rocks |
| 350 | QTb - Basalt |
| 450 | QTv - Quaternary and/or Tertiary volcanic rocks, undifferentiated |
| 1520 | TKcs - Conglomerate and sandstone |
| 1625 | TKvr - Felsic volcanic rocks |
| 1822 | Kcc - Nonmarine and marine carbonate-rich conglomerate and sandstone deltaic deposits |
| 2330 | Kva - Andesitic volcanic rocks (earliest Cretaceous, Neocomian, but may include Albian) |
| 2410 | Kgu - Granitic Rocks |
| 2460 | Kgl - Granite [< 85 Ma] |
| 2470 | Kgk - Quartz monzonite, monzonite, and syenite [< 85 Ma] |
| 2491 | Kmqm - Quartz monzonite, monzonite, and syenite 85-110 Ma |
| 2492 | Kmgd - Intermediate granitic rocks, mostly granodiorite |
| 2496 | Kmd - Diorite |
| 2530 | Keg - Quartz monzonite [>110 Ma] |
| 2535 | Kns - Nephelene syenite |
| 2545 | Ksy - Syenite |
| 2610 | Kmn - Migmatite associated with Cretaceous plutons of southern Brooks Range |
| 3470 | Jsct - Spruce Creek tonalite, Kugruk Fault Zone |
| 4990 | MzPzmk - Metamorphosed mafic rocks, metatonalite and serpentinite, Kugruk Fault Zone |
| 5190 | MzZum - Undivided dunite and serpentinite, Mesozoic or Paleozoic |
| 5321 | Pzls - Undivided limestone and schist, Paleozoic |
| 5575 | Pzpa - Phyllite and argillite, Grantley Harbor Fault Zone |
| 5650 | Pzng - Nome Complex metagabbro and metasedimentary rocks |
| 5651 | Pznm - Nome Complex marble |
| 5652 | Pznd - Nome Complex dolostone, undivided |
| 6325 | PaMl - Lisburne Group, undivided |
| 6670 | Snd - Nome Complex, dolostone |
| 6930 | DSl - Limestone, Late Devonian |
| 7250 | MDyao - Medium-grained granitic gneiss, Devonian intrusion age |
| 7251 | Dgn - Orthogneiss within Nome Complex |
| 7261 | Davf - Very light gray to brownish red weathering resistant schistose felsic volcanic rocks |
| 7461 | Dnd - Nome Complex dolostone, metalimestone, and marble |
| 7462 | DSns - Nome Complex, pelitic, calcareous, and graphitic schist |
| 7463 | Dnps - Nome Complex, pelitic schist |
| 7464 | DOnb - Nome Complex, black metalimestone and marble |
| 7465 | DCbm - Black marble, Nome Complex |
| 7466 | DCnk - Nome Complex, Calcareous schist of Kwinnik Mountain |
| 7467 | DOnx - Nome Complex, mixed marble, graphitic metaquartzite, and schist |
| 7468 | DOnx1 - Nome Complex, mixed marble, graphitic metaquartzite, and schist |
| 7520 | Ont - Novi Mountain and Telsitna Formations, and unnamed correlative units, massive dolomite and limestone, Late to Middle Ordovician |
| 7535 | SOdl - Limestone and dolomitic limestone |
| 7540 | Od - Nome Complex, pink to light gray weathering, gray to tan fine-grained dolostone with distinct color mottling |
| 7541 | Oshd - Limestone and shale |
| 7555 | Oal - Argillaceous limestone and limestone |
| 7565 | OZl - Limestone and dolomitic limestone |
| 7575 | OZp - Sandstone, siltstone, and limestone, York terrane |
| 7576 | OZt - Slate of the York region, slightly to moderately metamorphosed graphitic siltite, slate, graywacke, and calcareous siltite |
| 7720 | Ocs - Casadepaga schist |
| 7750 | Oim - Nome Complex, impure marble |
| 8360 | Cnd - Nome Complex, old dolostone |
| 8670 | PzZt - Metasiltstone and phyllite, Grantley Harbor Fault Zone |
| 8671 | PzZl - Metalimestone, Grantley Harbor Fault Zone |
| 8860 | PzZh - Nome Complex high-grade schist |
| 8861 | PzZm - Nome Complex high-grade marble |
| 9410 | pCg - Includes coarse-grained gabbro, diabase and altered equivalents which locally are garnet-glaucophane rocks |
| 9470 | pCgn - Orthogneiss |
| 9475 | Zv - Metavolcanic rocks |
ALT-SER - altered, sericitized Q - queried unit
| Value | Definition |
|---|---|
| BN002 | Till, A.B., Dumoulin, J.A., Gamble, B.M., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Solomon, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, scale 1:250,000 |
| BN004 | Till, A.B., Dumoulin, J.A., Gamble, B.M., Kaufman, D.S., and Carroll, P.I., 19??, Preliminary geologic map and fossil data, Solomon, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, scale 1:250,000, unpublished generalized version |
| BN005 | Till, A.B., Dumoulin, J.A., Werdon, M.B., and Bleick, H.A., in press, Preliminary bedrock geologic map of the Seward Peninsula, Alaska, and accompanying conodont data: U.S. Geological Survey Open-File Report 2009-1254, 82 p., 2 plates, scale 1:500,000. |
| CA002 | Patton, W.W., Jr., 1967, Regional geologic map of the Candle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-492, scale 1:250,000. |
| CA003 | Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, 2009, Geologic Map of the Yukon-Koyukuk Basin, Alaska U.S. Geological Survey Scientific Investigations Series Map SIM-2909, scale 1:500,000, 2 sheets and pamphlet [<https://pubs.usgs.gov/sim/2909/]>. |
| CA004 | Till, A.B., Dumoulin, J.A., Werdon, M.B., and Bleick, H.A., in press, Preliminary bedrock geologic map of the Seward Peninsula, Alaska, and accompanying conodont data: U.S. Geological Survey Open-File Report 2009-1254, 82 p., 2 plates, scale 1:500,000. |
| KZ002 | Till, A.B., Dumoulin, J.A., Gamble, B.M., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Solomon, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, scale 1:250,000 |
| KZ003 | Till, A.B., Dumoulin, J.A., Gamble, B.M., Kaufman, D.S., and Carroll, P.I., 19??, Preliminary geologic map and fossil data, Solomon, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, scale 1:250,000, unpublished generalized version |
| KZ004 | Beget, J.E., Hopkins, D.M., and Charron, S.D., 1996, The largest known maars on earth, Seward Peninsula, northwest Alaska: Arctic, v. 49, no. 1, p. 62-69. |
| KZ005 | Till, A.B., Dumoulin, J.A., Werdon, M.B., and Bleick, H.A., in press, Preliminary bedrock geologic map of the Seward Peninsula, Alaska, and accompanying conodont data: U.S. Geological Survey Open-File Report 2009-1254, 82 p., 2 plates, scale 1:500,000. |
| NM005 | Till, A.B., Dumoulin, J.A., Werdon, M.B., and Bleick, H.A., in press, Preliminary bedrock geologic map of the Seward Peninsula, Alaska, and accompanying conodont data: U.S. Geological Survey Open-File Report 2009-1254, 82 p., 2 plates, scale 1:500,000. |
| NM006 | Amato, J.M., Miller, E.L., Wright, J.E., and McIntosh, W.C., 2003, Dike swarms on Seward Peninsula, Alaska and their implications for the kinematics of Cretaceous extension in the Bering Strait region: Canadian Journal of Earth Sciences, v. 40, no. 6, p. 865-886. |
| NR003 | Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, 2009, Geologic Map of the Yukon-Koyukuk Basin, Alaska U.S. Geological Survey Scientific Investigations Series Map SIM-2909, scale 1:500,000, 2 sheets and pamphlet [<https://pubs.usgs.gov/sim/2909/]>. |
| NR004 | Till, A.B., Dumoulin, J.A., Werdon, M.B., and Bleick, H.A., in press, Preliminary bedrock geologic map of the Seward Peninsula, Alaska, and accompanying conodont data: U.S. Geological Survey Open-File Report 2009-1254, 82 p., 2 plates, scale 1:500,000. |
| SE002 | Patton, W.W., Jr., and Miller, T.P., 1968, Regional geologic map of the Selawik and southeastern Baird Mountains quadrangles, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-530, scale 1:250,000. |
| SE004 | Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, 2009, Geologic Map of the Yukon-Koyukuk Basin, Alaska U.S. Geological Survey Scientific Investigations Series Map SIM-2909, scale 1:500,000, 2 sheets and pamphlet [<https://pubs.usgs.gov/sim/2909/]>. |
| SE006 | Till, A.B., Dumoulin, J.A., Werdon, M.B., and Bleick, H.A., in press, Preliminary bedrock geologic map of the Seward Peninsula, Alaska, and accompanying conodont data: U.S. Geological Survey Open-File Report 2009-1254, 82 p., 2 plates, scale 1:500,000. |
| SF003 | Till, A.B., Dumoulin, J.A., Werdon, M.B., and Bleick, H.A., in press, Preliminary bedrock geologic map of the Seward Peninsula, Alaska, and accompanying conodont data: U.S. Geological Survey Open-File Report 2009-1254, 82 p., 2 plates, scale 1:500,000. |
| SO004 | Till, A.B., Dumoulin, J.A., Gamble, B.M., Kaufman, D.S., and Carroll, P.I., 19??, Preliminary geologic map and fossil data, Solomon, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, scale 1:250,000, unpublished generalized version |
| SO005 | Till, A.B., Dumoulin, J.A., Werdon, M.B., and Bleick, H.A., in press, Preliminary bedrock geologic map of the Seward Peninsula, Alaska, and accompanying conodont data: U.S. Geological Survey Open-File Report 2009-1254, 82 p., 2 plates, scale 1:500,000. |
| TE002 | Sainsbury, C.L., 1972, Geologic map of the Teller quadrangle, western Seward Peninsula, Alaska: U.S. Geological Survey Miscellaneous Investigations Map I-685, 4 p., 1 sheet, scale 1:250,000. |
| TE004 | Till, A.B., Dumoulin, J.A., Werdon, M.B., and Bleick, H.A., in press, Preliminary bedrock geologic map of the Seward Peninsula, Alaska, and accompanying conodont data: U.S. Geological Survey Open-File Report 2009-1254, 82 p., 2 plates, scale 1:500,000. |
| TE005 | Swanson, S.E., Turner, D.L., Forbes, R.B., and Hopkins, D.M., 1981, Petrology and geochronology of Tertiary and Quaternary basalts from the Seward Peninsula, western Alaska [abs.]: Geological Society of America Abstracts with Programs, v. 13, no. 7, p. 563. |
| TE006 | Amato, J.M., Miller, E.L., Wright, J.E., and McIntosh, W.C., 2003, Dike swarms on Seward Peninsula, Alaska and their implications for the kinematics of Cretaceous extension in the Bering Strait region: Canadian Journal of Earth Sciences, v. 40, no. 6, p. 865-886. |
| Value | Definition |
|---|---|
| 1 | Stratigraphic or intrusive contact, location certain |
| 4 | Normal fault, location certain; if ARC-PARA1 = 1, then upthrown side is on right from origin |
| 7 | Shoreline or riverbank |
| 30 | Fault, sense of displacement uncertain; location certain |
| 50 | Dikes and sills |
| 60 | Concealed fault, sense of displacement uncertain |
| 99 | Bounding line of coverage |
This data set was prepared by Keith Labay (USGS), Heather Bleick (USGS), Frederic Wilson (USGS), Kelly Brunt (Contractor) and Jim Hall (Contractor).
907-786-7444 (voice)
atill@usgs.gov
This data set represents part of a systematic effort to release geologic map data for the United States in a uniform manner. Geologic data in this series has been compiled from a wide variety of sources, published and unpublished, ranging from state and regional geologic maps to large- scale field mapping.
Person who carried out this activity:
907-786-7444 (voice)
atill@usgs.gov
There were many types of source materials, of varying scale, used to compile this data set. Sources include previously published maps, unpublished mapping, and air photo interpretation. The dates of the mapping range from the present to 1970's. Vector features were mostly heads up digitized from a scanned image. Vector and polygon attributes were assigned based on the original source. The digital data has been checked, and the geologic map has been technically reviewed and edited.
This data is presented for use at a nominal scale of 1:500,000, although some sources were from 1:250,000, 1:63,360, or 1:50,000 scale mapping.
The complete data set consists of 13 different GIS coverages, nine geology coverages and four dike coverages. There is also an associated relational database of geologic units. Each coverage has the extent of all or part of a 1:250,000 scale quadrangle. A graphic representation of the database and a report with complete geologic unit descriptions is provided in .pdf format.
Each geology coverage is a network coverage containing attributed arcs and polygons. Each polygon has a coded attribute designating the mapped geologic unit. Faults, stratigraphic contacts, and other linear features are represented as arcs. When a fault is also a stratigraphic contact, only a single arc is present. Dangling arcs may be present (faults, dike, etc.)
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- None. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.
1-888-ASK-USGS (voice)
Open-File Report 2009-1254
This world-wide web publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
| Data format: | ARCE |
|---|---|
| Network links: |
<https://pubs.usgs.gov/of/2009/1254> |
907-786-7410 (voice)
klabay@usgs.gov
Generated by mp version 2.8.11 on Fri Apr 23 16:33:10 2010