Labay, Keith A. Wilson, Frederic H. Bleick, Heather Shew, Nora B. 2008 ver 1.0 digital data U.S. Geological Survey Open-File Report OFR 2008-XXXX http//pubs.usgs.gov/of/2008/XXXX Till, Alison B. Dumoulin, Julie, A. Harris, Anita G. Moore, Thomas E. Bleick, Heather Siwiec, Benjamin 2008 map U.S. Geological Survey Scientific Investigations Map SIM-XXXX The southern Brooks Range spans northern Alaska from west to east. It has tree- and shrub-covered lowlands and tundra-covered and rocky uplands. Much of the area has ridgelines reaching about 4000 feet, but the central part of the map area has ridgelines exceeding 6000 feet and peaks above 7000 feet. The geology includes the Brooks Range orogen, a contractional mountain belt with a foreland basin on its north side. This map has been compiled from published maps and papers, and unpublished mapping by the authors. 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. 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 Geologic data in this series has been compiled from a wide variety of sources, published and unpublished, ranging from state and regional geologic maps to large-scale field mapping. 2008 publication date Complete As needed -162.0 -146.0 68.0 66.75 None geology bedrock orogen schist belt metamorphic Geographic names information system (GNIS) Alaska Brooks Range Baird Mountains Ambler River Survey Pass Wiseman Chandalar Christian Selawik Shungnak Bettles Beaver None None. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. U.S. Geological Survey Alison B. Till Geologist mailing and physical address

4200 University Drive

Anchorage Alaska 99508 U.S.A. 907-786-7444 atill@usgs.gov XXX XXX XXX This data set was prepared by Keith Labay (USGS), Nora Shew (USGS), David Pray (contractor), Nathan Pannkuk (contractor), Lana Cohen (contractor), Jeanie Yarnell (contractor) Data set was created using ESRI ARC/Info version 7.2.1 on a Unix platform. There were many types of source materials, of varying scale, used to compile this data set. Sources include previously published maps and unpublished mapping. The dates of the mapping range from the present to 1950's. Vector features were digitized on a large digitizing tablet or on screen 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. Each geology coverage is a network coverage containing attributed arcs and polyons. 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.) The complete data set consists of 11 geology GIS converages. There is also an associated relational database of geologic units. Each coverage has the full or partial extent of a 1:250,000 scale quadrangle. A graphic representation of the database (map) and a report including complete geologic unit descriptions is provided in .pdf format. This data is presented for use at a nominal scale of 1:500,000. Line work for the geology compilation was hand digitized from material of various media and scale. The arcs and polygons were attributed. The spatial databases are provided in UTM projection and geographic coordinates. The native ARC/Info coverages have been exported to an interchange file format, and also converted to shape files. Please note that shape files do not preserve arc directions, which help determine fault movement. 2007 U.S. Geological Survey Frederic H. Wilson Geologist mailing and physical

4200 University Drive

Anchorage Alaska 99508-4667 U.S.A. 907-786-7448 fwilson@usgs.gov Vector Universal Transverse Mercator 4 0.9995 -159.0 0.0 500000 0 coordinate pair 0.000256 0.000256 meters Universal Transverse Mercator 5 0.9995 -153.0 0.0 500000 0 coordinate pair 0.000256 0.000256 meters Universal Transverse Mercator 6 0.9995 -147.0 0.0 500000 0 coordinate pair 0.000256 0.000256 meters polygons Characteristics of the polygon features in the geology coverages are coded in the polygon attribute table. The table <cov>.pat includes the following items: CLASS, QCLASS, LITH2, SOURCE, NSACLASS, NSAMOD, LABEL, MIN_AGE, and MAX_AGE. Item LITH2 is used to generate the southern Brooks range map of Till and others, in press. NSACLASS is used for creating the generalized geologic map of Alaska. Items CLASS and SOURCE together identify the original mapping of the geologic unit. this data set LITH2 LITH2 is a positive integer value (4 5 B) item in the polygon attribute table. Values range discontinuously from 0 to 52090. LITH2 is a numeric code for the geologic unit (LABEL), as shown on the southern Brooks range map by Till and others, in press. LITH2 to LABEL is a one-to-one relationship. NOTE: Because of the limitations of common GIS fonts, the letters "C", "Mz", "Pz", "Tr", and "Z" are substituted for the standard symbols for "Cambrian", "Mesozoic", "Paleozoic", "Triassic", and "Proterozoic". this data set 100 Qs - Surficial sedimentary deposits, undivided (Quaternary) 102 water 2180 Kvg - Volcanic lithic sandstone and mudstone (Cretaceous) 5145 KJm - Melange (Cretaceous to Jurassic) 52000 Dsq - Quartz-mica schist (Devonian) 52001 DZsc - Calcareous schist (Devonian to Proterozoic) 52002 PzZb - Metasedimentary rocks of Bluecloud Mountain (Paleozoic to Proterozoic?) 52003 Dg - Granitic orthogneiss (Devonian) 52004 Da - Ambler sequence (Devonian) 52006 Pzsg - Mafic schist (Paleozoic) 52007 Pzpg - Phyllite and graywacke (Paleozoic?) 52008 DZm - Metamorphic rocks (Devonian to Proterozoic?) 52009 JDab - Mafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane (Early Jurassic to Devonian) 52011 Zg - Granitic orthogneiss (Proterozoic) 52012 PzZem - Metamorphic rocks of the Ernie Lake area (Paleozoic to Proterozoic) 52013 Zam - Metamorphic rocks of Mt. Angayukaqsraq (Proterozoic) 52015 OZc - Older carbonate rocks of the Nanielik antiform (Middle Ordovician to Proterozoic?) 52016 DOc - Younger carbonate rocks of the Nanielik antiform (Middle Devonian to Ordovician) 52017 Dmu - Metasedimentary and lesser metaigneous rocks (Middle and Late Devonian) 52018 Dhf - Hunt Fork Shale (Late Devonian) 52019 Dl - Metalimestone (Devonian) 52021 PzZqs - Quartz-rich metasedimentary rocks (Paleozoic to Proterozoic?) 52022 Khs - Hammond River shear zone (Cretaceous?) 52023 Pzm - Marble (Paleozoic) 52026 TrCs - Sedimentary rocks (Triassic to Carboniferous) 52027 Ml - Carbonate rocks (Mississippian) 52028 MDk - Kanayut Conglomerate (Lower Mississippian? and Upper Devonian) 52030 Pzp - Phyllite (Paleozoic?) 52032 Pzj - Metasedimentary rocks of Jesse Mountain (Paleozoic) 52034 PzZbs - Biotite schist (Paleozoic to Proterozoic?) 52035 PzZsr - Ruby schist (Paleozoic to Proterozoic?) 52036 Km - Migmatite (Cretaceous) 52037 Kg - Granitic rocks (Cretaceous) 52038 Ks - Conglomerate, sandstone, and shale (Cretaceous) 52039 QTb - Basalt (Quaternary? or Tertiary?) 52041 DZsc - Calcareous schist; metachert and conglomerate subunit (Devonian to Proterozoic) 52042 Ozc - Older carbonate rocks of the Nanielik antiform; restricted to Ordovian strata only (Middle Ordovician to Proterozoic?) 52043 Dmu - Metasedimentary and lesser metaigneous rocks; volcanic-rock bearing (Middle and Late Devonian) 52044 Dhf - Hunt Fork Shale (Late Devonian) 52045 DZgn - Schist and paragneiss (Devonian to Proterozoic?) 52046 PzZcm - Metasedimentary and metavolcanic rocks, undivided (Paleozoic and Proterozoic?) 52047 PzZm - Mafic schist (Paleozoic? to Proterozoic?) 52048 DZsm - Schist and marble, undivided (Devonian to Proterozoic?) 52049 Spl - Black phyllite and metalimestone (Silurian) 52052 Dmu - Metasedimentary and lesser metaigneous rocks; iron-rich and calcareous components (Middle and Late Devonian) 52053 Pzw - Metasedimentary rocks (Paleozoic) 52055 Pzw - Metasedimentary rocks; northern belt (Paleozoic) 52056 Dn - Noatak Sandstone (Devonian) 52057 SCvs - Volcanic and sedimentary rocks (Silurian to Cambrian) 52061 Mkl - Kayak Shale of Endicott Group and Lisburne Group (Mississippian) 52062 Mu - Metasedimentary rocks, undivided (Mississippian) 52063 DZsc - Calcareous schist; abundant albite porphyroblasts (Devonian to Proterozoic) 52065 Pzbq - Black quartzite (Paleozoic?) 52066 Pzb - Black phyllite and siliceous phyllite (Paleozoic?) 52067 PzZg - Granitic rocks (Paleozoic to Proterozoic?) 52068 Zam - Metamorphic rocks of Mt. Angayukaqsraq (Proterozoic) 52069 DOb - Baird Group (Devonian to Ordovician) 52070 MDer - Eli River sequence (Mississippian and Devonian) 52071 Mcp - Carbonaceous chert and siliceous phyllite (Mississippian) 52073 MzPzs - Serpentintite (Mesozoic? to Paleozoic?) 52074 MDe - Endicott Group, undivided (Mississippian and Devonian) 52075 JDk - Rocks of the Kivivik Creek sequence (Jurassic to Devonian) 52076 MzDm - Igneous and sedimentary rocks of the Maiyumerak Mountains (Mesozoic? to Devonian) 52077 Mc - Quartz-rich conglomerate (Mississippian?) 52081 Dps - Lithic sandstone and shale (Devonian) 52083 Dps - Lithic sandstone and shale; schistose (Devonian) 52084 DSc - Carbonate rocks of Cosmos Hills (Devonian and Silurian) 52085 Pzbs - Black metasedimentary rocks (Paleozoic) 52086 Pzpc - Carbonate rocks of phyllite belt (Paleozoic) 52087 Pzsm - Marble of the Schist belt (Paleozoic) 52088 Mkkl - Kekiktuk Conglomerate(?), Kayak Shale of Endicott Group, and Lisburne Group (Mississippian) 52089 MDk - Kanayut Conglomerate; area not differentiated from Noatak Sandstone (Lower Mississippian? and Upper Devonian) 52090 JCs - Sedimentary rocks (Jurassic to Carboniferous) NSACLASS NSACLASS is a positive integer value (4 5 B) item in the polygon attribute table. Values range discontinuously from 100 to 9325. NSACLASS is a numeric code for the geologic unit for the statewide database. This data set represents a generalized map, thus it is possible that a geologic unit consists of multiple NSACLASS values. Each NSACLASS matches to a geologic unit label in LABEL and has minimum (MIN_AGE) and maximum (MAX_AGE) range, given in million of years (my). 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 "C", "Mz", "Pz", "Tr", and "Z" are substituted for the standard symbols for "Cambrian", "Mesozoic", "Paleozoic","Triassic", and "Proterozoic". this data set 100 Qs - Surficial sedimentary deposits, undivided (Quaternary); QCLASS = 1000 102 water; QCLASS = 102 350 QTb - Basalt (Quaternary? or Tertiary?) 1990 Ks - Conglomerate, sandstone, and shale (Cretaceous) 2030 Ks - Conglomerate, sandstone, and shale (Cretaceous) 2180 Kvg - Volcanic lithic sandstone and mudstone (Cretaceous) 2492 Kg - Granitic rocks (Cretaceous) 2610 Km - Migmatite (Cretaceous) 2650 Khs - Hammond River shear zone (Cretaceous?) 3498 MzPzs - Serpentinite (Mesozoic? to Paleozoic?) 4951 MzDm - Igneous and sedimentary rocks of the Maiyumerak Mountains (Mesozoic? to Devonian) 5001 JDk - Rocks of the Kivivik Creek sequence (Jurassic to Devonian) 5003 JCs - Sedimentary rocks (Jurassic to Carboniferous) 5004 TrCs - Sedimentary rocks (Triassic to Carboniferous) 5133 JDab - Mafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane (Early Jurassic to Devonian) 5140 JDab - Mafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane (Early Jurassic to Devonian) 5145 KJm - Melange (Cretaceous to Jurassic?) 5525 DSc - Carbonate rocks of Cosmos Hills (Devonian and Silurian) 5560 Pzp - Phyllite (Paleozoic?) 5565 Pzpg - Phyllite and graywacke (Paleozoic?) 5570 Pzpc - Carbonate rocks of phyllite belt (Paleozoic) 6200 Mcp - Carbonaceous chert and siliceous phyllite (Mississippian) 6300 MDe - Endicott Group, undivided (Mississippian and Devonian) 6305 Mkkl - Kekiktuk Conglomerate(?), Kayak Shale of Endicott Group, and Lisburne Group (Mississippian) 6320 Ml - Carbonate rocks (Mississippian) 6328 Mkl - Kayak Shale of Endicott Group and Lisburne Group (Mississippian) 6331 Pzbs - Black metasedimentary rocks (Paleozoic) 6360 Mc - Quartz-rich conglomerate (Mississippian?) 6365 Mu - Metasedimentary rocks, undivided (Mississippian) 6686 Spl - Black phyllite and metalimestone (Silurian) 6720 SCvs - Volcanic and sedimentary rocks (Silurian to Cambrian) 6850 Pzj - Metasedimentary rocks of Jesse Mountain (Paleozoic) 6900 Dn - Noatak Sandstone (Devonian) 6914 MDk - Kanayut Conglomerate (Lower Mississippian? and Upper Devonian) 6915 MDk - Kanayut Conglomerate (Lower Mississippian? and Upper Devonian) 6925 Dhf - Hunt Fork Shale (Late Devonian) 6927 Dmu - Metasedimentary and lesser metaigneous rocks (Middle and Late Devonian) 6951 Dl - Metalimestone (Devonian) 6972 Dmu - Metasedimentary and lesser metaigneous rocks (Middle and Late Devonian) 6973 Dmu - Metasedimentary and lesser metaigneous rocks (Middle and Late Devonian) 6980 DOc - Younger carbonate rocks of the Nanielik antiform (Middle Devonian to Ordovician) 6982 MDer - Eli River sequence (Mississippian and Devonian) 6983 Pzm - Marble (Paleozoic) 7000 Pzsg - Mafic schist (Paleozoic) 7200 Dps - Lithic sandstone and shale (Devonian) 7215 Pzsm - Marble of the Schist belt (Paleozoic) 7225 Dhf - Hunt Fork Shale (Late Devonian) 7235 Pzb - Black phyllite and siliceous phyllite (Paleozoic?) 7250 Dg - Granitic orthogneiss (Devonian) 7260 Da - Ambler sequence (Devonian) 7360 DZsm - Schist and marble, undivided (Devonian to Proterozoic?) 7361 DZgn - Schist and paragneiss (Devonian to Proterozoic?) 7740 OZc - Older carbonate rocks of the Nanielik antiform (Middle Ordovician to Proterozoic?) 7741 OZc - Older carbonate rocks of the Nanielik antiform (Middle Ordovician to Proterozoic?) 8601 PzZbs - Biotite schist (Paleozoic to Proterozoic?) 8602 Dsq - Quartz-mica schist (Devonian) 8603 PzZqs - Quartz-rich metasedimentary rocks (Paleozoic to Proterozoic?) 8604 PzZb - Metasedimentary rocks of Bluecloud Mountain (Paleozoic to Proterozoic?) 8605 DZsc - Calcareous schist (Devonian to Proterozoic) 8607 DZsc - Calcareous schist (Devonian to Proterozoic) 8608 DZsc - Calcareous schist (Devonian to Proterozoic) 8611 PzZem - Metamorphic rocks of the Ernie Lake area (Paleozoic to Proterozoic) 8655 PzZcm - Metasedimentary and metavolcanic rocks, undivided (Paleozoic and Proterozoic?) 8661 PzZm - Mafic schist (Paleozoic? to Proterozoic?) 8852 DZm - Metamorphic rocks (Devonian to Proterozoic?) 9045 PzZg - Phyllite and graywacke (Paleozoic?) 9060 Zg - Granitic orthogneiss (Proterozoic) 9300 Zam - Metamorphic rocks of Mt. Angayukaqsraq (Proterozoic) 9325 PzZsr - Ruby schist (Paleozoic to Proterozoic?) NSAMOD NSAMOD is a character (8 10 C) item in the polygon attribute table. It contains modifiers of the geologic unit. this data set HFS - contact metamorphism, hornfels SOURCE SOURCE is a character (6 8 C) item found in both the arc and polygon attribute tables. The values are abbreviated codes representing the original source reference for the polygon or arc feature. The format for SOURCE is XX###, wher XX is a two letter code for the 1:250,000 scale quadrangle and ### is a three digit number (with leading zeros). All source codes with '001' are unspecified sources for water and ice features, often paper topographic maps, and DRG or DLG files. this data set AR003 Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska: U.S. Geological Survey Scientific Investigations Series Map SIM-2909, scale 1:500,000. AR004 Till. A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000. BM004 Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000. BT002 Patton, W.W., Jr., and Miller, T.P., 1973, Bedrock geologic map of Bettles and southern part of Wiseman quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-492, scale 1:250,000. BT003 Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska: U.S. Geological Survey Scientific Investigations Series Map SIM-2909, scale 1:500,000. BT005 Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000. BV004 Wilson/Hults edits 8/22/2007 BV006 Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000. CH004 Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000. CS002 Brosge, W.P., and Reiser, H.N., 2000, Geology of the Christian quadrangle, Alaska: U.S. Geological Survey Open-File Report 00-192, scale 1:250,000. CS003 Till, A.B., Dumoulin, J.A., Phillips, J.D., Stanley, R.G., and Crews, Jesse, in prep., Generalized bedrock geologic map, Yukon flats region, east-central Alaska: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, pamphlet, 1 plate, scale 1:500,000. CS004 Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000. HU002 Patton, W.W., Jr., and Miller, T.P., 1966, Regional geologic map of the Hughes quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Series Map I-459, scale 1:250,000. HU003 Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska: U.S. Geological Survey Scientific Investigations Series Map SIM-2909, scale 1:500,000. HU004 Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000. SE003 Karl, S.M., Dumoulin, J.A., Ellersieck, Inyo, Harris, A.G., and Schmidt, J.M., 1989, Preliminary geologic map of the Baird Mountains and part of the Selawik quadrangles, Alaska: U.S. Geological Survey Open-File Report 89-551, 65p., 1 sheet, scale 1:250,000. SE005 Till, A.G., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000. SH002 Patton, W.W., Jr., Miller, T.P., and Tailleur, I.L., 1968, Regional geologic map of the Shungnak and southern part of the Ambler River quadrangles, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-554, scale 1:250,000. SH004 Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska: U.S. Geological Survey Scientific Investigations Series Map SIM-2909, scale 1:500,000. SH005 Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000. SP003 Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconniassance geologic map and digital data for the Yukon-Koyukuk basin, Alaska: U.S. Geological Survey Scientific Investigations Map SIM-2909, scale 1:500,000. SP004 Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000. WI007 Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000. arcs Characteristics of the arc features in the geology coverages are coded in the arc attribute table. Table <cov>.aat includes the following items: ARC-CODE, ARC-PARA1, and SOURCE. For explanation of SOURCE, see attribute definitions for polygons. this data set ARC-CODE ARC-CODE is a positive integer value (3 3 I) item in the arc attribute table. Values range discontinuously from 1 to 99. Values match one-for-one with geologic features, such as stratigraphic boundary, fault, etc. Some ARC-CODE features have additional modifiers in item ARC-PARA1. this data set 1 Stratigraphic or intrusive contact, location certain 2 Stratigraphic or intrusive contact, location approximate 3 Stratigraphic or intrusive contact, location inferred, queried 4 Normal fault, location certain; if ARC-PARA1 = 1, then upthrown side is on right from origin 5 Normal fault, location approximate, if ARC-PARA1 = 1, then upthrown side is on right from origin 7 Shoreline or riverbank 9 Boundary or altered zone or hornfels 10 Thrust fault, location certain; teeth on right from origin 11 Thrust fault, location approximate; teeth on right from origin 30 Fault, sense of displacement unknown, location certain 31 Fault, sense of displacement unknown, location approximate 32 Fault, sense of displacement unknown, location inferred or queried 52 Normal fault, concealed; if ARC-PARA1 = 1, then upthrown side is on right from origin 53 Thrust fault, concealed; teeth on right from origin 57 Concealed right lateral fault 60 Concealed fault, sense of displacement unknown 87 Right lateral fault, location certain 88 Right lateral fault, location approximate 99 Bounding line of coverage U.S. Geological Survey mailing address

MS 902 Box 25286 Denver Federal Center

Lakewood CO 80225 USA 1-888-ASK-USGS Open-File Report 2008-XXXX 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. Although all data and software published on this web-site have been used by the USGS, no warranty expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials. ARCE zip files http://pubs/usgs.gov/of/2008/XXXX There is no cost for the download of these digital files 20080303 U.S. Geological Survey Nora B. Shew mailing and physical address

4200 University Drive

Anchorage AK 99508 USA 907-786-7445 nshew@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998