Identification_Information: Citation: Citation_Information: Originator: Bundtzen, T.K. Originator: Harris, E.E. Originator: Gilbert, W.G. Publication_Date: 1997 Title: Geologic Map of the Eastern Half of the McGrath Quadrangle, Alaska Geospatial_Data_Presentation_Form: map and vector digital data Series_Information: Series_Name: Report of Investigations Issue_Identification: RI 97-14A Publication_Information: Publication_Place: Fairbanks, Alaska - USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Other_Citation_Details: 34 pp., 1 sheet, scale 1:125,000 Online_Linkage: http://dx.doi.org/10.14509/2549 Description: Abstract: This map is a compilation of previously unpublished and published data, as well as from updated field mapping. This publication offers a 1:125,000-scale map sheet accompanied by a booklet containing a summary of the geology, a colored terrane map, map unit descriptions, a summary table listing selected mineral deposits and energy resources, references, and a correlation of map units. The text (in the report) describes the geology and resource potential of a highly mineralized region centered in the Farewell silver-lead-zinc district southeast of McGrath. Potentially important coal resources flanking the Alaska Range are also described in the map area. Purpose: This project and resulting report, map and layers are intended to provide a geologic map and a geologic interpretation of the eastern half of the McGrath Quadrangle at 1:125,000 scale. Companies involved in or considering mineral exploration in the McGrath area will find this map useful, as well as persons examining the region's coal resources as a potential fuel for local heat and power development. Supplemental_Information: The layers listed below are present as ArcGIS shape files. Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label." Basic unit information is also included in the geologic unit code set file "RI1997-14_codeset.pdf." Layers include: >mcggeog_arc geologic map unit contacts (arc) >mcggeog_poly geologic map unit contacts (polygon) >mcgflt_arc fault location traces and types >mcgglacial_arc glacial extents >mcgcline_arc anticline and syncline traces of axial planes >mcgdike_arc dike locations and probable lengths >mcgstrsym_point points for the strike, dip, and plunge of bedding planes, foliation, and various lineaments >mcgstrdip_point point attribute table that displays strike and dip information >mcgmine_point location of selected mineral deposits and energy resources Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19800701 Ending_Date: 19970630 Currentness_Reference: June 20, 1997 (publication date) Status: Progress: complete Maintenance_and_Update_Frequency: none planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -154.628732 East_Bounding_Coordinate: -152.883844 North_Bounding_Coordinate: 63.025637 South_Bounding_Coordinate: 61.962990 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: Alluvial Deposits Theme_Keyword: Colluvial Deposits Theme_Keyword: Eolian Theme_Keyword: Geologic Hazards Theme_Keyword: Geologic Materials Theme_Keyword: Geology Theme_Keyword: Glacial Deposits Place: Place_Keyword_Thesaurus: none Place_Keyword: Alaska, State of Place_Keyword: McGrath Stratum: Stratum_Keyword_Thesaurus: none Stratum_Keyword: Denali-Farewell Fault Stratum_Keyword: Dillinger Terrane Stratum_Keyword: Farewell Terrane Stratum_Keyword: Kahiltna Terrane Stratum_Keyword: McKinley Terrane Stratum_Keyword: Middle Fork Plutonic Complex Stratum_Keyword: Mystic Terrane Stratum_Keyword: Pingston Terrane Stratum_Keyword: Post River Pluton Stratum_Keyword: Veleska Lake Volcanic Complex Stratum_Keyword: Yukon-Tanana Terrane Temporal: Temporal_Keyword_Thesaurus: none Temporal_Keyword: Cambrian Temporal_Keyword: Carboniferous Temporal_Keyword: Cenozoic Temporal_Keyword: Cretaceous Temporal_Keyword: Devonian Temporal_Keyword: Early Devonian Temporal_Keyword: Early Jurassic Temporal_Keyword: Early Silurian Temporal_Keyword: Jurassic Temporal_Keyword: Late Devonian Temporal_Keyword: Late Permian Temporal_Keyword: Late Silurian Temporal_Keyword: Mesozoic Temporal_Keyword: Middle Devonian Temporal_Keyword: Ordovician Temporal_Keyword: Paleozoic Temporal_Keyword: Permian Temporal_Keyword: Proterozoic Temporal_Keyword: Quaternary Temporal_Keyword: Silurian Temporal_Keyword: Tertiary Temporal_Keyword: Triassic 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Contact_Position: GIS Data Manager/Cartographer Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Contact_Voice_Telephone: (907) 451-5029 Contact_Voice_Telephone: (907) 451-5020 Contact_Facsimile_Telephone: (907) 451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Contact_Instructions: You may view our web site at http://www.dggs.alaska.gov for the latest information on available data. Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change. Data_Set_Credit: This map synthesis was partially supported by the U.S. Geological Survey's National Mapping Program under cooperative agreement 1434-HQ-96-AG-01471. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. government. Additional Acknowledgments: Bedrock geology field investigations by T.K. Bundtzen (1980-1984,1988-1989,1993), W.G. Gilbert (1981-1984,1989), E.E. Harris (1988-1989,1993), D.N. Solie (1981-1982,1984,1988-1989), and J.T. Kline (1980-1982,1988-1989). Additional field contributions by M.S. Lockwood(1982-1983), J.G.Clough(1981,1983), T.E. Smith(1982-1983), Kate Bull (1981-1982), K.M. McDonald (1982), Kristin Kline (1981), D.B. Dickey (1981), John Ebel (1982), Larry Lueck (1980), G.M. Laird (1989), Grant Abbot (1989,1993), S.P. Gordey (1989), R.B. Blodgett (1982-1983,1989), D.J. Szumigala (1983), and Carolyn Parker (1983). Surficial geology field investigations by J.T. Kline (1980-1982,1988-89) and T.K. Bundtzen (1981-1984, 1988). Map synthesis and compilation by E.E. Harris and T.K. Bundtzen; Technical review by M.L. Miller and R.A. Combellick; Electronic digital cartography by A.M. McCarthy and G.R.C. Graham; Color design by Ann-Lillian Schell; Editing done by Paula K. Davis. Native_Data_Set_Environment: ArcInfo, ArcGIS post-version 7.0, and any text editor. Cross_Reference: Citation_Information: Originator: Kline, J.T. Originator: Pinney, D.S. Publication_Date: 1997 Title: Derivative Map of the Geologic Materials and Hazards in the Eastern Half McGrath Quadrangle, Alaska Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Report of Investigations Issue_Identification: RI 97-14B Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:125,000 Online_Linkage: http://dx.doi.org/10.14509/2550 Cross_Reference: Citation_Information: Originator: Kline, J.T. Originator: Bundtzen, T.K. Publication_Date: 1986 Title: Two Glacial Records from West-Central Alaska Publication_Information: Publication_Place: Anchorage, AK, USA Publisher: Geological Society of Alaska Other_Citation_Details: p. 123-150 Larger_Work_Citation: Citation_Information: Originator: Hamilton, T.D. (ed.) Originator: Reed, K.M. (ed.) Originator: Thorson, R.M. (ed.) Publication_Date: 1986 Title: Glaciation in Alaska: the Geologic Record Publication_Information: Publication_Place: Anchorage, AK, USA Publisher: Geological Society of Alaska Cross_Reference: Citation_Information: Originator: Bundtzen, T.K. Originator: Kline, J.T. Originator: Clough, J.G. Publication_Date: 1982 Title: Preliminary Geology of McGrath B-2 Quadrangle, Alaska Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Alaska Open-File Report 149 Issue_Identification: AOF 149 Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Other_Citation_Details: 25 pp., 1 sheet, scale 1:40,000 Online_Linkage: http://dx.doi.org/10.14509/69 Cross_Reference: Citation_Information: Originator: Gilbert, W.G. Originator: Solie, D.N. Originator: Kline, J.T. Originator: Dickey, D.B. Publication_Date: 1990 Title: Geologic Map of the McGrath B-3 Quadrangle, Alaska Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Professional Report 102 Issue_Identification: PR 102 Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Other_Citation_Details: 2 sheets, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/2283 Cross_Reference: Citation_Information: Originator: Bundtzen, T.K. Originator: Kline, J.T. Originator: Smith, T.E. Originator: Albanese, M.D. Publication_Date: 1987 Title: Geologic Map of the McGrath A-2 Quadrangle, Alaska Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Professional Report 91 Issue_Identification: PR 91 Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Other_Citation_Details: 20 pp., 1 sheet, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/2272 Cross_Reference: Citation_Information: Originator: Gilbert, W.G. Originator: Solie, D.N. Originator: Kline, J.T. Publication_Date: 1988 Title: Geologic Map of the McGrath A-3 Quadrangle, Alaska Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Professional Report 92 Issue_Identification: PR 92 Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Other_Citation_Details: 2 sheets, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/2273 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Data for geologic layers was digitized off of a mylar geologic compilation. This compilation was done on a stable mylar of the USGS topographic base for the McGrath Quadrangle, Alaska that was photographically enlarged to 1:125,000. (Topographic base compiled in 1965, revised in 1978, 1980, and 1982.) 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. Logical_Consistency_Report: Polygon topology present and clean on appropriate coverages. Other coverages are line, point, or annotation coverages and do not require topologic relationships. Chain-node topology present. Completeness_Report: This data set includes coverages that contain information about geologic units, sample locations, structural features, structural measurements, dikes, selected mines, glacial limits, and materials units. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Location data were determined visually using topographic maps at scales of 1:63,360 and 1:40,000 scale topographic maps using USGS map bases. Some stations were plotted on 1:63,360 scale Infra-Red and 1:40,000 scale black and white air photos during mapping. Because location information was acquired during the time period 1980-1992, GPS technology was not used to determine locations. Instead, geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps and in some instances, air photos. The lists of samples were visually checked against the lists of analyzed samples returned from the laboratories. Quantitative_Horizontal_Positional_Accuracy_Assessment: Horizontal_Positional_Accuracy_Value: 100 Horizontal_Positional_Accuracy_Explanation: The estimated horizontal error of this dataset is +/- 100 meters. Geologic map data have a horizontal positional accuracy dependent on the "on-screen" method of digital cartography. Map error is induced by: (1) the nominal scale of the aerial photographs on which it is based, with an estimated potential error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground; (2) the error produced by suturing and stretching air photos during orthorectification, with measured errors ranging from X-Y meters; (3) the digitizing RMS error, which varies with digitizing session from X-Y meters; and (4) the accuracy of the human operator digitizing the geologic linework from the topographic base maps and orthophoto, with an estimated error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Thommen TM altimeters were frequently used and calibrated daily. Quantitative_Vertical_Positional_Accuracy_Assessment: Vertical_Positional_Accuracy_Value: 6 Vertical_Positional_Accuracy_Explanation: The estimated horizontal error of this dataset is +/- 6 meters, based upon the inherent instrument errors of the Thommen TM altimeter. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Kline, J.T. Originator: Pinney, D.S. Publication_Date: 19970620 Title: Derivative Map of the Geologic Materials and Hazards in the Eastern Half McGrath Quadrangle, Alaska Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Report of Investigations Issue_Identification: RI 97-14B Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:125,000 Online_Linkage: http://dx.doi.org/10.14509/2550 Source_Scale_Denominator: 125000 Type_of_Source_Media: paper map Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19800701 Ending_Date: 19970630 Source_Currentness_Reference: Published in 1997 based on a compilation of work done in the area from a period of 1981 to 1997 Source_Citation_Abbreviation: Kline and Pinney, 1997 Source_Contribution: See references cited in reports in RI 1997-14A and RI 1997-14B Source_Information: Source_Citation: Citation_Information: Originator: Fernald, A.T. Publication_Date: 1960 Title: Geomorphology of the Upper Kuskokwim Region, Alaska Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Bulletin 1071-G Issue_Identification: B 1071-G Publication_Information: Publication_Place: Washington, D.C. Publisher: United States Government Printing Office Other_Citation_Details: p. 191-279, 2 sheets, scale 1:250,000 Online_Linkage: http://www.dggs.alaska.gov/pubs/id/3608 Source_Scale_Denominator: 250000 Type_of_Source_Media: paper map and report Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1960 Source_Currentness_Reference: Publication date Source_Citation_Abbreviation: Fernald, 1960 Source_Contribution: The geologic map synthesis has benefited from regional surficial geologic investigations provided in this bulletin. Source_Information: Source_Citation: Citation_Information: Originator: Kline, J.T. Originator: Bundtzen, T.K. Publication_Date: 1986 Title: Two Glacial Records from West-Central Alaska Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Anchorage, AK, USA Publisher: Geological Society of Alaska Other_Citation_Details: p. 123-150 Larger_Work_Citation: Citation_Information: Originator: T.D. Hamilton, eds. Originator: K.M. Reed, eds. Originator: R.M. Thorson, eds. Publication_Date: 1986 Title: Glaciation in Alaska: the Geologic Record Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Anchorage, AK, USA Publisher: Geological Society of Alaska Type_of_Source_Media: book Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1960 Source_Currentness_Reference: Publication date Source_Citation_Abbreviation: Kline and Bundtzen, 1986 Source_Contribution: The geologic map synthesis has benefited from regional surficial geologic investigations provided in this publication. Source_Information: Source_Citation: Citation_Information: Originator: Reed, B.L. Originator: Lanphere, M.A. Publication_Date: 1972 Title: Generalized Geologic Map of the Alaska-Aleutian Range Batholith Showing Potassium-Argon Ages of the Plutonic Rocks Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Miscellaneous Field Studies Map 372 Issue_Identification: MF-372 Publication_Information: Publication_Place: Washington, D.C. Publisher: United States Government Printing Office Other_Citation_Details: 2 sheets, scale 1:1,000,000 Online_Linkage: http://www.dggs.alaska.gov/pubs/id/13162 Source_Scale_Denominator: 1000000 Type_of_Source_Media: paper map Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1972 Source_Currentness_Reference: Publication date Source_Citation_Abbreviation: Reed and Lanphere, 1972 Source_Contribution: The geologic map synthesis has benefited from regional geologic mapping provided in this publication. Source_Information: Source_Citation: Citation_Information: Originator: Reed, B.L. Originator: Nelson, S.W. Publication_Date: 1980 Title: Geologic Map of the Talkeetna Quadrangle, Alaska Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Miscellaneous Investigations Map I-1174 Issue_Identification: I-1174 Publication_Information: Publication_Place: Washington, D.C. Publisher: United States Government Printing Office Other_Citation_Details: 1 sheet, scale 1:250,000 Online_Linkage: http://www.dggs.alaska.gov/pubs/id/12942 Source_Scale_Denominator: 250000 Type_of_Source_Media: paper map Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1980 Source_Currentness_Reference: Publication date Source_Citation_Abbreviation: Reed and Nelson, 1980 Source_Contribution: The geologic map synthesis has benefited from regional geologic mapping provided in this publication. Source_Information: Source_Citation: Citation_Information: Originator: Herreid, G.H. Publication_Date: 1968 Title: Geological and Geochemical Investigations Southwest of Farewell, Alaska Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Geologic Report Issue_Identification: GR 26 Publication_Information: Publication_Place: Fairbanks, AK, USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Other_Citation_Details: 24 p., 2 sheets, scale 1:72,411 Online_Linkage: http://dx.doi.org/10.14509/355 Source_Scale_Denominator: 72411 Type_of_Source_Media: paper map Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1968 Source_Currentness_Reference: Publication date Source_Citation_Abbreviation: Herreid, 1968 Source_Contribution: The geologic map synthesis has benefited from detailed mapping in the Windy Fork area provided in this publication. Source_Information: Source_Citation: Citation_Information: Originator: Michael Churkin, Jr. Originator: Claire Carter Publication_Date: 1996 Title: Stratigraphy, Structure, and Graptolites of an Ordovician and Silurian Sequence in the Terra Cotta Mountains, Alaska Range, Alaska Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Professional Paper 1555 Issue_Identification: P 1555 Publication_Information: Publication_Place: Washington, D.C. Publisher: United States Government Printing Office Other_Citation_Details: 84 p., 4 sheets, scale 1:24,000 Online_Linkage: http://www.dggs.alaska.gov/pubs/id/4018 Source_Scale_Denominator: 24000 Type_of_Source_Media: paper map and report Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1996 Source_Currentness_Reference: Publication date Source_Citation_Abbreviation: Churkin and Carter, 1996 Source_Contribution: The geologic map synthesis has benefited from detailed mapping in the Terra Cotta Mountains provided in this publication. Process_Step: Process_Description: The coverages included in this project are digitized from a mylar compilation of geologic field maps produced on USGS topo bases of the area. Map unit (polygon) locations and attributes were checked by three reviewers familiar with the dominant geologic rock types and structures and/or the specific geology of the McGrath quadrangle area. Location data were determined visually using topographic maps at scales of 1:63,360 and 1:40,000 scale topographic maps using USGS map bases. Some stations were plotted on 1:63,360 scale Infra-Red and 1:40,000 scale black and white air photos during mapping. Because location information was acquired during the time period 1980-1992, GPS technology was not used to determine locations. Instead, geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps and in some instances, air photos. Process_Date: 1997 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 5N Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -153.000 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Layer_Name: mcggeog_arc Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000001 Ordinate_Resolution: 0.000001 Planar_Distance_Units: meters Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 5N Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -153.000 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Layer_Name: mcggeog_poly Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000001 Ordinate_Resolution: 0.000001 Planar_Distance_Units: meters Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 5N Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -153.000 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Layer_Name: mcgflt_arc Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000001 Ordinate_Resolution: 0.000001 Planar_Distance_Units: meters Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 5N Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -153.000 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Layer_Name: mcgglacial_arc Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000001 Ordinate_Resolution: 0.000001 Planar_Distance_Units: meters Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 5N Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -153.000 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Layer_Name: mcgcline_arc Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000001 Ordinate_Resolution: 0.000001 Planar_Distance_Units: meters Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 5N Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -153.000 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Layer_Name: mcgdike_arc Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000001 Ordinate_Resolution: 0.000001 Planar_Distance_Units: meters Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 5N Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -153.000 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Layer_Name: mcgstrdip_point Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000001 Ordinate_Resolution: 0.000001 Planar_Distance_Units: meters Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 5N Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -153.000 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Layer_Name: mcgstrsym_point Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000001 Ordinate_Resolution: 0.000001 Planar_Distance_Units: meters Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 5N Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -153.000 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Layer_Name: mcgmine_point Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000001 Ordinate_Resolution: 0.000001 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: D_Clarke_1866 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.978698 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: mcggeog_arc Entity_Type_Label: mcggeog_arc.shp Entity_Type_Definition: Object type is vector, there are 10,322 rows associated with this entity, and the entity values refer to geologic map unit contacts. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: CODE Attribute_Definition: Line symbol for geologic map unit contacts Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 5 Enumerated_Domain_Value_Definition: Contact Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: MERGECODE Attribute_Definition: Used to notate contacts that are faults. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: C Enumerated_Domain_Value_Definition: Contact only Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: F Enumerated_Domain_Value_Definition: Contact/fault Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: mcggeog_poly Entity_Type_Label: mcggeog_poly.shp Entity_Type_Definition: Object type is vector, there are 3221 rows associated with this entity, and the entity values refer to the unit name abbreviations for each specific polygon represented on the map. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: UNIT Attribute_Definition: A unique three to four letter abbreviation given to each map unit represented on the map. Any unit ending with a "?" indicates uncertainty. Attribute_Definition_Source: Alaska Division of Geological and Geophysical Surveys Attribute_Domain_Values: Codeset_Domain: Codeset_Name: RI1997-14_codeset.pdf Codeset_Source: Alaska Division of Geological & Geophysical Surveys http://www.dggs.alaska.gov/metadata/RI1997-14_codeset.pdf Attribute: Attribute_Label: MAT Attribute_Definition: A unique three letter abbreviation given to each materials unit represented on the map. Materials units imply a hazards classification. Attribute_Definition_Source: Alaska Division of Geological and Geophysical Surveys Attribute_Domain_Values: Codeset_Domain: Codeset_Name: RI1997-14_codeset.pdf Codeset_Source: Alaska Division of Geological & Geophysical Surveys http://www.dggs.alaska.gov/metadata/RI1997-14_codeset.pdf Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: mcgflt_arc Entity_Type_Label: mcgflt_arc.shp Entity_Type_Definition: Object type is vector, there are 750 rows associated with this entity, and the entity values refer to fault location traces and types. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: CODE Attribute_Definition: Types of faults found in the map area. Attribute_Definition_Source: Alaska Division of Geological and Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 11 Enumerated_Domain_Value_Definition: high-angle fault Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 12 Enumerated_Domain_Value_Definition: Approximately located fault Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 13 Enumerated_Domain_Value_Definition: Fault, inferred Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 15 Enumerated_Domain_Value_Definition: Concealed fault Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 17 Enumerated_Domain_Value_Definition: Thrust fault, sawteeth on upper plate Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 33 Enumerated_Domain_Value_Definition: Lineament, used on small-scale tectonic maps Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: MERGECODE Attribute_Definition: Used to notate contacts that are faults. Attribute_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: C Enumerated_Domain_Value_Definition: Contact only Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: F Enumerated_Domain_Value_Definition: Contact/fault Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: mcgglacial_arc Entity_Type_Label: mcgglacial_arc.shp Entity_Type_Definition: Object type is vector, there are 43 rows associated with this entity, and the entity values refer to glacial extents. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: CODE Attribute_Definition: Ice limit advances-Increasing roman numerals depict maximum drift limits and numerical superscripts depict stages sequentially from oldest to youngest. Attribute_Definition_Source: Alaska Division of Geological and Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 42 Enumerated_Domain_Value_Definition: Glacial limit I, approximately located, first advance (oldest) Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 44 Enumerated_Domain_Value_Definition: Glacial limit II, approximately located, second advance Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 46 Enumerated_Domain_Value_Definition: Glacial limit III, approximately located, third advance Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 48 Enumerated_Domain_Value_Definition: Glacial limit IV, approximately located, fourth advance Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 50 Enumerated_Domain_Value_Definition: Glacial limit V, approximately located, fifth advance Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: mcgcline_arc Entity_Type_Label: mcgcline_arc.shp Entity_Type_Definition: Object type is vector, there are 319 rows associated with this entity, and the entity values refer to the anticline and syncline traces of axial planes. This coverage must be viewed with mcgstrsym layer to know what type of anticline or syncline is being represented by the arc. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: CODE Attribute_Definition: A number representing the anticline or syncline trace. Attribute_Definition_Source: Alaska Division of Geological and Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 34 Enumerated_Domain_Value_Definition: Fold axis anticline or syncline. Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 38 Enumerated_Domain_Value_Definition: Anticline or syncline, concealed. Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: mcgdike_arc Entity_Type_Label: mcgdike_arc.shp Entity_Type_Definition: Object type is vector, there are 375 rows associated with this entity, and the entity values refer to dike locations and probable lengths. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: CODE Attribute_Definition: One of four numbers that represent dikes found in this map area. Attribute_Definition_Source: Alaska Division of Geological and Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 54 Enumerated_Domain_Value_Definition: Dikes Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 55 Enumerated_Domain_Value_Definition: Dikes Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 56 Enumerated_Domain_Value_Definition: Dikes Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 57 Enumerated_Domain_Value_Definition: Dikes Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: mcgstrdip_point Entity_Type_Label: mcgstrdip_point.shp Entity_Type_Definition: Object type is point, there are 656 rows associated with this entity, and the entity values refer to symbols for strike and dip information. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: DIP Attribute_Definition: Represents the dip angles used to produce the dip directions. Attribute_Definition_Source: Alaska Division of Geological and Geophysical Surveys Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 90 Attribute: Attribute_Label: CODE Attribute_Definition: Represents the symbols used to describe the strike and dips of beds, cleavage, joints, and foliation. Attribute_Definition_Source: Alaska Division of Geological and Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 1 Enumerated_Domain_Value_Definition: Strike and direction of dip of beds. Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 4 Enumerated_Domain_Value_Definition: Strike and dip of overturned beds. Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 5 Enumerated_Domain_Value_Definition: Strike of vertical beds, stratigraphic tops to north. Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: X-COORD Attribute_Definition: Represents the X-coordinates in UTM for each strike and dip location. Attribute_Definition_Source: Alaska Division of Geological and Geophysical Surveys Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 422695.41 Range_Domain_Maximum: 499879.98 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: Y-COORD Attribute_Definition: Represents the Y-coordinates in UTM for each strike and dip location. Attribute_Definition_Source: Alaska Division of Geological and Geophysical Surveys Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 6874551.19 Range_Domain_Maximum: 6952135.66 Attribute_Units_of_Measure: meters Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: mcgstrsym_point Entity_Type_Label: mcgstrsym_point.shp Entity_Type_Definition: Object type is point, there are 202 rows associated with this entity, and the entity values refer to symbols for folds, anticlines, synclines, and bedding features. This coverage must be viewed with mcgcline layer to know the trace of the anticline or syncline. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: SYMBOL Attribute_Definition: Used for differentiating structural symbol types. Attribute_Definition_Source: Alaska Division of Geological and Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 22 Enumerated_Domain_Value_Definition: Anticline and trace of axial plane. Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 23 Enumerated_Domain_Value_Definition: Syncline and trace of axial plane. Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 24 Enumerated_Domain_Value_Definition: Relative horizontal movement along fault Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 25 Enumerated_Domain_Value_Definition: Relative horizontal movement along fault Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 26 Enumerated_Domain_Value_Definition: overturned syncline, showing direction of dip of limbs Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 27 Enumerated_Domain_Value_Definition: Overturned anticline, showing direction of dip of limbs Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 39 Enumerated_Domain_Value_Definition: Provides direction of plunge. Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: mcgmine_point Entity_Type_Label: mcgmine_point.shp Entity_Type_Definition: Object type is point, there are 38 rows associated with this entity, and the entity values refer to symbols for selected metallic mineral deposits and energy resources. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Attribute: Attribute_Label: SYMBOL Attribute_Definition: This attribute represents the location of selected mineral deposits and energy resources. Attribute_Definition_Source: Alaska Division of Geological and Geophysical Surveys Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 143 Enumerated_Domain_Value_Definition: Specific symbol to designate sample locality. Enumerated_Domain_Value_Definition_Source: Alaska Division of Geological & Geophysical Surveys ESRI Markerset Mineral.mrk Attribute: Attribute_Label: MINE Attribute_Definition: Each number represents the sample location number of the selected mineral deposits and energy resources portrayed in Geologic Map of the Eastern Half of the McGrath Quadrangle, Alaska (Sheet 1). Attribute_Definition_Source: Alaska Division of Geological and Geophysical Surveys Attribute_Domain_Values: Unrepresentable_Domain: These values represent the actual locality numbers given to each selected mineral deposits and energy resources. They coincide with Table 1 ("Name of Deposit") of the report Geologic Map of the Eastern Half of the McGrath Quadrangle, Alaska. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Contact_Position: Natural Resource Technician Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: 907-451-5020 Contact_TDD/TTY_Telephone: None available. Contact_Facsimile_Telephone: 907-451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please view our web site (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Resource_Description: Report of Investigation 97-14A Distribution_Liability: 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. Standard_Order_Process: Non-digital_Form: 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. Fees: Printed publication can be purchased for $17.00 (contact information below) plus shipping if mailed. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: PDF Format_Version_Number: 1.6 File_Decompression_Technique: No compression applied Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://dx.doi.org/10.14509/2549 Digital_Form: Digital_Transfer_Information: Format_Name: ArcGIS Shapefile Format_Version_Number: ESRI ArcGIS 9.x File_Decompression_Technique: No compression applied Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://dx.doi.org/10.14509/2549 Offline_Option: Offline_Media: CD-ROM Recording_Format: Joliet Fees: Digital files on CD-ROM are available for $10.00 (contact information below). No fees charged for downloaded files. Ordering_Instructions: Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), 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. Turnaround: 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. Technical_Prerequisites: Please check the MapInfo web site (http://www.mapinfo.com/) for the latest documentation on importing ESRI shape files. Metadata_Reference_Information: Metadata_Date: 20080506 Metadata_Review_Date: 20080506 Metadata_Future_Review_Date: 20100506 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical address Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: 907-451-5039 Contact_Facsimile_Telephone: 907-451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays. Contact_Instructions: Please contact us through the e-mail address above whenever possible. Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: none Metadata_Use_Constraints: If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.