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Nicholson, Suzanne W., Dicken, Connie L., Foose, Michael P., and Mueller, Julia A.L., 2004, The Upper Midwest States: Minnesota, Wisconsin, Michigan, Illinois and Indiana - The State of Minnesota: U.S. Geological Survey Open-File Report 2004-1355, U.S. Geological Survey, Reston, VA.This is part of the following larger work.Online Links:
Nicholson, Suzanne W., Dicken, Connie L., Foose, Michael P., and Mueller, Julia A.L., 2004, Integrated geologic map databases for the United States: The Upper Midwest States: Minnesota, Wisconsin, Michigan, Illinois and Indiana: U.S. Geological Survey Open-File Report 1355, U.S. Geological Survey, Reston, VA.Online Links:
This is a Vector data set.
The map projection used is Lambert Conformal Conic.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.01
Ordinates (y-coordinates) are specified to the nearest 0.01
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 1/294.98.
| Value | Definition |
|---|---|
| Adg | Deer Lake sequence and upper part of the Newton Lake Formation |
| Agb | Mentor mafic complex |
| Agd | Post-Algoman intermediate intrusions |
| Agm | Algoman granite-rich migmatite |
| Agr | Syntectonic to pre-Algoman granitoid rocks |
| Amg | Middle Archean and older rocks |
| Ami | Post-Algoman mafic intrusions |
| Amm | Late Archean mixed metavolcanic rocks |
| Ams | Late Archean metasedimentary rocks, undivided |
| Amv | Late Archean mafic metavolcanic rocks |
| Aps | Paragneiss, schist, and amphibolite |
| Aqz | Late Archean felsic to intermediate volcanic rocks |
| Asm | Paragneiss and schist-rich migmatite |
| Ast | Saganaga Tonalite of northeastern Minnesota |
| Cu | Upper Cambrian, undivided |
| Dc | Chicksaw Member of the Little Cedar Formation (Cedar Valley Group) |
| Dl | Lithograph City Formation, Coralville Formation and Hinckle and Eagle City Members of the Little Cedar Formation (Cedar Valley Group), undivided |
| Du | Devonian rocks, undivided |
| Dw | Bassett Member of the Little Cedar Formation (Cedar Valley Group) and Pinicon Ridge and Spillville Formations (Wapsipinicon Group) |
| J | Jurassic rocks, undivided |
| Kc | Coleraine Formation |
| Ku | Cretaceous rocks, undivided |
| Ol | Lower Ordovician rocks, undivided |
| Om | Middle Ordovician rocks, undivided |
| Omd | Decorah Shale (Middle Ordovician) |
| Omu | Middle and Upper Ordovician rocks, undivided |
| Oum | Upper and Middle Ordovician rocks, undivided |
| Pedq | Denham Formation |
| Pedv | Metabasalt, metadiabase, and metasedimentary rocks metamorphosed to lower greenschist facies |
| Peg | Shale, siltstone, feldspathic graywacke, and associated volcaniclastic rocks [of the Animikie Group] |
| Pegd | Syntectonic intrusions of the Penokean orogen |
| Pegr | Late-tectonic intrusions of the Penokean orogen |
| Pegs | Graphitic schist, phyllite and slate interbedded on a fine scale [in the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| Pegv | Graphitic schist, slate, and silicate iron-formation metamorphosed to the lower greenschist facies and related conditions |
| Peif | Iron-formation [of the Animikie Group] |
| Pelf | Quartz-rich slate, argillite, and schist in the northwestward extent of the unit and coarse-grained megacrystic garnet-staurolite-schist in the southwestward extent [in the Little Falls Formation] |
| Pem | Metadiabase, undivided [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| Pemq | Quartz arenite, siltstone, and chert-rich dolostone of the Trout Lake Formation in Crow Wing County [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| Pemt | Unnamed schistose, volcanic, and hypabyssal rocks of mafic composition and volcanic, volcaniclastic, and intrusive rocks of felsic composition |
| Penm | Mahnomen Formation [of the North Range Group] |
| Penr | Rabbit Lake Formation [of the North Range Group] |
| Pent | Trommald Formation [of the North Range Group] |
| Peop | Post-tectonic intrusions of the Penokean orogen |
| Peps | Metagraywacke, metasiltstone, and a variety of schistose rocks metamorphosed to the amphibolite grade [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| Peq | Pokegama Quartzite |
| Peqd | Quartzite at Dam Lake [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| Pes | Sioux Quartzite |
| Pesa | Slate, argillite, and metasiltstone metamorphosed to the lower greenschist facies [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| Pevd | Metabasalt, metadiabase, and metasedimentary rocks metamorphosed to lower amphibolite facies [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| Pma | Anorthositic series of the Duluth Complex |
| Pmbg | Selected granophyric and leuco-granitic phases of troctolitic-gabbroic intrusions in the Beaver Bay Complex [in Subvolcanic rocks, undivided] |
| Pmbu | Beaver Bay Complex and other named and unnamed gabbroic-troctolitic intrusions [of Subvolcanic mafic rocks, undivided] |
| Pmc | Chengwatana Volcanic Group |
| Pmdg | Felsic series of the Duluth Complex |
| Pmf | Fond du Lac Formation |
| Pmg | Early gabbros [of the Duluth Complex] |
| Pmh | Hinckley Sandstone |
| Pml | Logan Intrusions |
| Pmnn | Normally polarized volcanic rocks, undivided [of the North Shore Volcanic Group] |
| Pmnp | Schroeder-Lutsen basalts [of the North Shore Volcanic Group] |
| Pmnr | Reversely polarized volcanic rocks, undivided [of the North Shore Volcanic Group] |
| Pms | Solor Church Formation |
| Pmt | Troctolitic and gabbroic cumulate rocks [of the Duluth Complex] |
| Value | Definition |
|---|---|
| Adg;0 | Deer Lake sequence and upper part of the Newton Lake Formation |
| Agb;0 | Mentor mafic complex |
| Agd;0 | Post-Algoman intermediate intrusions |
| Agm;0 | Algoman granite-rich migmatite |
| Agr;0 | Syntectonic to pre-Algoman granitoid rocks |
| Amg;0 | Middle Archean and older rocks |
| Ami;0 | Post-Algoman mafic intrusions |
| Amm;0 | Late Archean mixed metavolcanic rocks |
| Ams;0 | Late Archean metasedimentary rocks, undivided |
| Amv;0 | Late Archean mafic metavolcanic rocks |
| Aps;0 | Paragneiss, schist, and amphibolite |
| Aqz;0 | Late Archean felsic to intermediate volcanic rocks |
| Asm;0 | Paragneiss and schist-rich migmatite |
| Ast;0 | Saganaga Tonalite of northeastern Minnesota |
| Cu;0 | Upper Cambrian, undivided |
| Dc;0 | Chicksaw Member of the Little Cedar Formation (Cedar Valley Group) |
| Dl;0 | Lithograph City Formation, Coralville Formation and Hinckle and Eagle City Members of the Little Cedar Formation (Cedar Valley Group), undivided |
| Du;0 | Devonian rocks, undivided |
| Dw;0 | Bassett Member of the Little Cedar Formation (Cedar Valley Group) and Pinicon Ridge and Spillville Formations (Wapsipinicon Group) |
| Ju;0 | Jurassic rocks, undivided |
| Kc;0 | Coleraine Formation |
| Ku;0 | Cretaceous rocks, undivided |
| Ol;0 | Lower Ordovician rocks, undivided |
| Om;0 | Middle Ordovician rocks, undivided |
| Omd;0 | Decorah Shale (Middle Ordovician) |
| Omu;0 | Middle and Upper Ordovician rocks, undivided |
| Oum;0 | Upper and Middle Ordovician rocks, undivided |
| PRedq;0 | Denham Formation |
| PRedv;0 | Metabasalt, metadiabase, and metasedimentary rocks metamorphosed to lower greenschist facies |
| PReg;0 | Shale, siltstone, feldspathic graywacke, and associated volcaniclastic rocks [of the Animikie Group] |
| PRegd;0 | Syntectonic intrusions of the Penokean orogen |
| PRegr;0 | Late-tectonic intrusions of the Penokean orogen |
| PRegs;0 | Graphitic schist, phyllite and slate interbedded on a fine scale [in the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| PRegv;0 | Graphitic schist, slate, and silicate iron-formation metamorphosed to the lower greenschist facies and related conditions |
| PReif;0 | Iron-formation [of the Animikie Group] |
| PRelf;0 | Quartz-rich slate, argillite, and schist in the northwestward extent of the unit and coarse-grained megacrystic garnet-staurolite-schist in the southwestward extent [in the Little Falls Formation] |
| PRem;0 | Metadiabase, undivided [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| PRemq;0 | Quartz arenite, siltstone, and chert-rich dolostone of the Trout Lake Formation in Crow Wing County [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| PRemt;0 | Unnamed schistose, volcanic, and hypabyssal rocks of mafic composition and volcanic, volcaniclastic, and intrusive rocks of felsic composition |
| PRenm;0 | Mahnomen Formation [of the North Range Group] |
| PRenr;0 | Rabbit Lake Formation [of the North Range Group] |
| PRent;0 | Trommald Formation [of the North Range Group] |
| PReop;0 | Post-tectonic intrusions of the Penokean orogen |
| PReps;0 | Metagraywacke, metasiltstone, and a variety of schistose rocks metamorphosed to the amphibolite grade [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| PReq;0 | Pokegama Quartzite |
| PReqd;0 | Quartzite at Dam Lake [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| PRes;0 | Sioux Quartzite |
| PResa;0 | Slate, argillite, and metasiltstone metamorphosed to the lower greenschist facies [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| PRevd;0 | Metabasalt, metadiabase, and metasedimentary rocks metamorphosed to lower amphibolite facies [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| PRma;0 | Anorthositic series of the Duluth Complex |
| PRmbg;0 | Selected granophyric and leuco-granitic phases of troctolitic-gabbroic intrusions in the Beaver Bay Complex [in Subvolcanic rocks, undivided] |
| PRmbu;0 | Beaver Bay Complex and other named and unnamed gabbroic-troctolitic intrusions [of Subvolcanic mafic rocks, undivided] |
| PRmc;0 | Chengwatana Volcanic Group |
| PRmdg;0 | Felsic series of the Duluth Complex |
| PRmf;0 | Fond du Lac Formation |
| PRmg;0 | Early gabbros [of the Duluth Complex] |
| PRmh;0 | Hinckley Sandstone |
| PRml;0 | Logan Intrusions |
| PRmnn;0 | Normally polarized volcanic rocks, undivided [of the North Shore Volcanic Group] |
| PRmnp;0 | Schroeder-Lutsen basalts [of the North Shore Volcanic Group] |
| PRmnr;0 | Reversely polarized volcanic rocks, undivided [of the North Shore Volcanic Group] |
| PRms;0 | Solor Church Formation |
| PRmt;0 | Troctolitic and gabbroic cumulate rocks [of the Duluth Complex] |
| Value | Definition |
|---|---|
| MNAdg;0 | Deer Lake sequence and upper part of the Newton Lake Formation |
| MNAgb;0 | Mentor mafic complex |
| MNAgd;0 | Post-Algoman intermediate intrusions |
| MNAgm;0 | Algoman granite-rich migmatite |
| MNAgr;0 | Syntectonic to pre-Algoman granitoid rocks |
| MNAmg;0 | Middle Archean and older rocks |
| MNAmi;0 | Post-Algoman mafic intrusions |
| MNAmm;0 | Late Archean mixed metavolcanic rocks |
| MNAms;0 | Late Archean metasedimentary rocks, undivided |
| MNAmv;0 | Late Archean mafic metavolcanic rocks |
| MNAps;0 | Paragneiss, schist, and amphibolite |
| MNAqz;0 | Late Archean felsic to intermediate volcanic rocks |
| MNAsm;0 | Paragneiss and schist-rich migmatite |
| MNAst;0 | Saganaga Tonalite of northeastern Minnesota |
| MNCu;0 | Upper Cambrian, undivided |
| MNDc;0 | Chicksaw Member of the Little Cedar Formation (Cedar Valley Group) |
| MNDl;0 | Lithograph City Formation, Coralville Formation and Hinckle and Eagle City Members of the Little Cedar Formation (Cedar Valley Group), undivided |
| MNDu;0 | Devonian rocks, undivided |
| MNDw;0 | Bassett Member of the Little Cedar Formation (Cedar Valley Group) and Pinicon Ridge and Spillville Formations (Wapsipinicon Group) |
| MNJu;0 | Jurassic rocks, undivided |
| MNKc;0 | Coleraine Formation |
| MNKu;0 | Cretaceous rocks, undivided |
| MNOl;0 | Lower Ordovician rocks, undivided |
| MNOm;0 | Middle Ordovician rocks, undivided |
| MNOmd;0 | Decorah Shale (Middle Ordovician) |
| MNOmu;0 | Middle and Upper Ordovician rocks, undivided |
| MNOum;0 | Upper and Middle Ordovician rocks, undivided |
| MNPRedq;0 | Denham Formation |
| MNPRedv;0 | Metabasalt, metadiabase, and metasedimentary rocks metamorphosed to lower greenschist facies |
| MNPReg;0 | Shale, siltstone, feldspathic graywacke, and associated volcaniclastic rocks [of the Animikie Group] |
| MNPRegd;0 | Syntectonic intrusions of the Penokean orogen |
| MNPRegr;0 | Late-tectonic intrusions of the Penokean orogen |
| MNPRegs;0 | Graphitic schist, phyllite and slate interbedded on a fine scale [in the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| MNPRegv;0 | Graphitic schist, slate, and silicate iron-formation metamorphosed to the lower greenschist facies and related conditions |
| MNPReif;0 | Iron-formation [of the Animikie Group] |
| MNPRelf;0 | Quartz-rich slate, argillite, and schist in the northwestward extent of the unit and coarse-grained megacrystic garnet-staurolite-schist in the southwestward extent [in the Little Falls Formation] |
| MNPRem;0 | Metadiabase, undivided [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| MNPRemq;0 | Quartz arenite, siltstone, and chert-rich dolostone of the Trout Lake Formation in Crow Wing County [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| MNPRemt;0 | Unnamed schistose, volcanic, and hypabyssal rocks of mafic composition and volcanic, volcaniclastic, and intrusive rocks of felsic composition |
| MNPRenm;0 | Mahnomen Formation [of the North Range Group] |
| MNPRenr;0 | Rabbit Lake Formation [of the North Range Group] |
| MNPRent;0 | Trommald Formation [of the North Range Group] |
| MNPReop;0 | Post-tectonic intrusions of the Penokean orogen |
| MNPReps;0 | Metagraywacke, metasiltstone, and a variety of schistose rocks metamorphosed to the amphibolite grade [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| MNPReq;0 | Pokegama Quartzite |
| MNPReqd;0 | Quartzite at Dam Lake [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| MNPRes;0 | Sioux Quartzite |
| MNPResa;0 | Slate, argillite, and metasiltstone metamorphosed to the lower greenschist facies [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| MNPRevd;0 | Metabasalt, metadiabase, and metasedimentary rocks metamorphosed to lower amphibolite facies [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt] |
| MNPRma;0 | Anorthositic series of the Duluth Complex |
| MNPRmbg;0 | Selected granophyric and leuco-granitic phases of troctolitic-gabbroic intrusions in the Beaver Bay Complex [in Subvolcanic rocks, undivided] |
| MNPRmbu;0 | Beaver Bay Complex and other named and unnamed gabbroic-troctolitic intrusions [of Subvolcanic mafic rocks, undivided] |
| MNPRmc;0 | Chengwatana Volcanic Group |
| MNPRmdg;0 | Felsic series of the Duluth Complex |
| MNPRmf;0 | Fond du Lac Formation |
| MNPRmg;0 | Early gabbros [of the Duluth Complex] |
| MNPRmh;0 | Hinckley Sandstone |
| MNPRml;0 | Logan Intrusions |
| MNPRmnn;0 | Normally polarized volcanic rocks, undivided [of the North Shore Volcanic Group] |
| MNPRmnp;0 | Schroeder-Lutsen basalts [of the North Shore Volcanic Group] |
| MNPRmnr;0 | Reversely polarized volcanic rocks, undivided [of the North Shore Volcanic Group] |
| MNPRms;0 | Solor Church Formation |
| MNPRmt;0 | Troctolitic and gabbroic cumulate rocks [of the Duluth Complex] |
| Value | Definition |
|---|---|
| MN001 | Morey, G.B., and Meints, Joyce, 2000, Geologic map of Minnesota - Bedrock Geology: Minnesota Geological Survey, State Map Series, S-20, 3rd edition, scale 1:1,000,000. available on line at: <http://www.geo.umn.edu/mgs/currentpubs.htm> |
| Value | Definition |
|---|---|
| Cretaceous | |
| Devonian | |
| Early Proterozoic | |
| Jurassic | |
| Late Archean | |
| Late Cambrian | |
| Late and Middle Ordovician | |
| Lower Ordovician | |
| Middle Ordovician | |
| Middle Proterozoic | |
| Middle and Late Ordovician | |
| Middle to Early Archean |
| Value | Definition |
|---|---|
| anorthosite | |
| arenite | |
| basalt | |
| claystone | |
| conglomerate | |
| diabase | |
| dolostone (dolomite) | |
| felsic volcanic rock | |
| gabbro | |
| gneiss | |
| granite | |
| graywacke | |
| iron formation | |
| limestone | |
| mafic metavolcanic rock | |
| monzonite | |
| mudstone | |
| paragneiss | |
| pyroxenite | |
| quartzite | |
| sandstone | |
| schist | |
| shale | |
| slate | |
| tonalite | |
| troctolite | |
| water |
| Value | Definition |
|---|---|
| amphibolite | |
| arenite | |
| argillite | |
| conglomerate | |
| diabase | |
| diorite | |
| dolostone (dolomite) | |
| felsic metavolcanic rock | |
| felsic volcanic rock | |
| gabbro | |
| granodiorite | |
| graywacke | |
| limestone | |
| migmatite | |
| monzodiorite | |
| peridotite | |
| phyllite | |
| rhyolite | |
| sandstone | |
| schist | |
| sedimentary rock | |
| shale | |
| siltstone | |
| slate | |
| trachybasalt | |
| troctolite | |
| water |
| Value | Definition |
|---|---|
| 1 | contact, location certain |
| 7 | shoreline or riverbank |
| 12 | thrust fault, location inferred, queried, teeth on right from origin |
| 32 | fault, sense of displacement unknown or undefined, location inferred or queried |
| 124 | state boundary |
| 125 | international boundary |
| Value | Definition |
|---|---|
| 0 | no additional information |
| 1 | for normal faults, upthrown side is to the right |
| Value | Definition |
|---|---|
| 0 | no additional information |
| Value | Definition |
|---|---|
| MN001 | Morey, G.B., and Meints, Joyce, 2000, Geologic map of Minnesota - Bedrock Geology: Minnesota Geological Survey, State Map Series, S-20, 3rd edition, scale 1:1,000,000. available on line at: <http://www.geo.umn.edu/mgs/currentpubs.htm> |
| US001 | Johnson, Bruce R. and Leveritch, Beth, 1998, 1:100,000 Scale State Boundaries of the Conterminous United States: U.S. Geological Survey, unpublished (see metadata file: st100kmeta.txt, CONUSdocumentationMW.pdf) |
State Geologic Map Compilation (SGMC) activity of the National Surveys and Analysis projects of the US Geological Survey Mineral Resources Program.
703-648-6344 (voice)
swnich@usgs.gov
A primary goal of this work is to develop geologic map datasets with standardized structure and attribution. The database design and standards are documented in CONUSdocumentationMW.pdf of this series. The intent is that contiguous databases can be merged seamlessly and without any additional effort. In addition to a common database structure, the conterminous U.S. state databases (the contiguous 48 states) have been fitted to a set of standard state boundaries so that, when states are merged, they match without slivers or overlap. No attempt has been made to reconcile differences in mapping across state boundaries.
Morey, G.B. (compiler), and Meints, Joyce (compiler), 2000, Geologic map of Minnesota, bedrock geology (3rd edition): Minnesota Geological Survey State Map Series S-20, Minnesota Geological Survey, St. Paul, Minnesota.Online Links:
Johnson, Bruce R., unpublihsed material, 1:100,000 Scale State Boundaries of the Conterminous United States.
Johnson, Bruce R., unpublished material, Geologic Map Unit Classification, ver. 6.1.
The values of the attributes ROCKTYPE1 and ROCKTYPE2 were assigned based on the information in the legends of the source maps (most of which are paper). The definitions of these values are described in the draft document Geologic Map Classification version 6.1 (Johnson and others); available at the following website: <http://geology.usgs.gov/dm>
The geologic map was digitized from compilations ranging in scale from 1:1,000,000 to 1:100,000 and is an accurate representation of the source maps. It is intended to be used at scales ranging from 1:1,000,000 to 1:500,000. Display at significantly larger scales may produce small errors in locations of contacts or faults relative to features contained in other data sets.
Accuracy of Minnesota state boundary and those arcs intersecting it: The accuracy of the state boundary arcs is based on the 1:100000 scale original data used to produce this boundary. (Johnson, Bruce R. and Leveritch, Beth, 1998, 1:100,000 Scale State Boundaries of the Conterminous United States: U.S. Geological Survey, unpublished (see metadata file: st100kmeta.txt, CONUSdocumentationMW.pdf)) Those internal arcs intersecting the state boundary were extended or shortened as needed to complete polygons, possibly creating a small amount of error.
Bodies of water are classified as water, and the geologic units underlying them are not included in this coverage.
All internal polygons were checked for closure with vendor software and on hard copy plots. Overshoots and undershoots have been deleted or corrected as appropriate.
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints:
- This database is not meant to be used or displayed at any scale other than 1:500,000. Any hardcopies utilizing these data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the U.S. Geological Survey.
1-888-ASK-USGS or 1-703-648-5953 (voice)
<http://www.usgs.gov/contact/>
USGS OFR 2004-1355
This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey (USGS) editorial standard nor with the North American stratigraphic codes. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the USGS. Although these data have been used by the USGS and have been successfully imported into data base programs, no warranty, expressed or implied, is made by the USGS as to how successfully or accurately the data can be imported into any specific application software running on any specific hardware platform. The fact of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith. This data base GIS is not meant to be used or displayed at any scale other than 1:500,000.
| Data format: | Geologic units and structural features in format ARC/INFO export (version 8.3) |
|---|---|
| Network links: |
<http://pubs.usgs.gov/of/2004/1355/> |
703-648-6482 (voice)
cdicken@usgs.gov
U.S. Department of the Interior |
U.S. Geological Survey
Page Contact Information: Peter Schweitzer
Page Last Modified: Tuesday, 11-Dec-2012 15:23:21 MST
