Identification_Information: Citation: Citation_Information: Originator: Sweetkind, D.S. Originator: du Bray, E. A. Publication_Date: 2007 Title: Compilation of Stratigraphic Thicknesses for Caldera-Related Tertiary Volcanic Rocks, East-Central Nevada and West-Central Utah Edition: 1.0 Geospatial_Data_Presentation_Form: raster digital data Series_Information: Series_Name: Data Series Issue_Identification: 271 Publication_Information: Publication_Place: Denver, Colorado Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/ds/271 Description: Abstract: Published isopach maps for most of the major, regionally distributed ash-flow tuffs of east-central Nevada and west-central Utah were obtained. Paper maps at a variety of scales were scanned and geo-referenced in a Geographic Information System (GIS) and the location and thickness values as measured at outcrops of individual tuffs were digitized from these published maps. In order to preserve the original author's interpreted contour patterns, additional thickness data were created by digitizing a regular series of points along each contour line of the isopach maps. For each tuff, these thickness data were gridded as 2500-m square cells within the GIS to produce a digital thickness grid as raster data sets. Thickness was gridded using either inverse distance or simple kriging algorithms; the gridding methodology was chosen on the basis of how closely the digital grid resembled the original published contour map. Grids were locally hand-edited in order to recreate abrupt thickness changes at known or inferred caldera boundaries. Using this approach, digital thickness grids were created for the following ash-flow tuffs; the geologic unit name is followed by the feature data set name in the geodatabase: the Kalamazoo Tuff (kalam_ipach), the Windous Butte Formation (windous_ipach), the Monotony Tuff (monot_ipach), the Shingle Pass Tuff (shingle_ipach), the Cottonwood Wash Tuff (cotton_ipach), the Wah Wah Springs Formation (wahwah_ipach), the Lund Formation (lund_ipach), the Isom Formation (isom_ipach), the Leach Canyon Formation (leach_ipach), the Condor Canyon Formation (condor_ipach), and the Harmony Hills Tuff (harmony_ipach). The thickness values from these individual isopach maps were summed using grid addition to produce a composite isopach that combines the gridded thickness for all of the above units (ipach_volcs). Purpose: These data were developed provide a general understanding of the distribution and thickness of Tertiary ash-flow tuffs within intermontane basins in east-central Nevada and western Utah. Proposed ground-water development in White Pine County, Nevada, and adjacent areas in Nevada and Utah could impact water accumulations in three general types of aquifer materials: consolidated Paleozoic carbonate bedrock, and basin-filling Cenozoic volcanic rocks and unconsolidated Quaternary sediments. At present, the full impact of extracting ground-water from any or all of these potential, valley graben reservoirs is not fully understood. A thorough understanding of intermontane basin stratigraphy, mostly concealed by the youngest unconsolidated deposits that blanket the surface in these valleys, is critical to an understanding of the regional hydrology in this area. This data set is a literature-based compilation of geologic data, especially thicknesses and lithologic characteristics, for Tertiary volcanic rocks that are presumably present in the subsurface of the intermontane valleys that are prominent features of this area. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2007 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -117.020538 East_Bounding_Coordinate: -111.603986 North_Bounding_Coordinate: 40.121566 South_Bounding_Coordinate: 36.742625 Keywords: Theme: Theme_Keyword_Thesaurus: American Geological Institute Thesarus Theme_Keyword: Isopach Theme_Keyword: Ash-flow tuff Theme_Keyword: Tertiary Place: Place_Keyword_Thesaurus: Geographic Names Inventory System Place_Keyword: Nevada Place_Keyword: Utah Place_Keyword: USA Access_Constraints: None Use_Constraints: Acknowlegment of the U.S. Geological Survey would be appropriate in products derived from these data. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Donald Sweetkind Contact_Position: Research Geologist Contact_Address: Address_Type: mailing and physical address Address: Box 25046, MS 973, U.S Geological Survey City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-1828 Contact_Facsimile_Telephone: 303-236-3200 Contact_Electronic_Mail_Address: dsweetkind@usgs.gov Security_Information: Security_Classification_System: None Security_Classification: Unclassified Security_Handling_Description: None Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350 Data_Quality_Information: Logical_Consistency_Report: No tests for logical consistency have been performed on this rster catalog dataset. Completeness_Report: The raster data set was computer-generated by Sweetkind and others (2006). The data set is complete and is not anticipated to change. Lineage: Process_Step: Process_Description: Published isopach maps for most of the major, regionally distributed ash-flow tuffs of east-central Nevada and west-central Utah were obtained. Paper maps at a variety of scales were scanned and geo-referenced in a Geographic Information System (GIS) and the location and thickness values as measured at outcrops of individual tuffs were digitized from these published maps. In order to preserve the original author's interpreted contour patterns, additional thickness data were created by digitizing a regular series of points along each contour line of the isopach maps. For each tuff, these thickness data were gridded as 2500-m square cells within the GIS to produce a digital thickness grid as raster data sets. Thickness was gridded using either inverse distance or simple kriging algorithms; the gridding methodology was chosen on the basis of how closely the digital grid resembled the original published contour map. Grids were locally hand-edited in order to recreate abrupt thickness changes at known or inferred caldera boundaries. Using this approach, digital thickness grids were created for the following ash-flow tuffs; the geologic unit name is followed by the feature data set name in the geodatabase: the Kalamazoo Tuff (kalam_ipach), the Windous Butte Formation (windous_ipach), the Monotony Tuff (monot_ipach), the Shingle Pass Tuff (shingle_ipach), the Cottonwood Wash Tuff (cotton_ipach), the Wah Wah Springs Formation (wahwah_ipach), the Lund Formation (lund_ipach), the Isom Formation (isom_ipach), the Leach Canyon Formation (leach_ipach), the Condor Canyon Formation (condor_ipach), and the Harmony Hills Tuff (harmony_ipach). The thickness values from these individual isopach maps were summed using grid addition to produce a composite isopach that combines the gridded thickness for all of the above units (ipach_volcs). Process_Date: 2007 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Donald Sweetkind Contact_Organization: U.S. Geological Survey Contact_Position: Research Geologist Contact_Address: Address_Type: mailing address Address: Box 25046, MS 973, U.S Geological Survey City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-236-1828 Contact_Facsimile_Telephone: 303-236-3200 Contact_Electronic_Mail_Address: dsweetkind@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 145 Column_Count: 185 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 11 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -117.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000215 Ordinate_Resolution: 0.000215 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Resolution: 0.000001 Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Isopach Entity_Type_Definition: Estimated stratigraphic thicknesses of Tertiary ash-flow tuffs of east-central Nevada and western Utah derived from published thickness (isopach) maps for individual ash-flow tuffs Entity_Type_Definition_Source: ESRI ARCGIS 9.1 Attribute: Attribute_Label: OBJECTID Attribute_Definition: Internal feature number. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: Raster Attribute_Definition: Data type Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: Name Attribute_Definition: Internal name Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: Shape_Length Attribute_Definition: Length of feature in internal units. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: Shape_Area Attribute_Definition: Area of feature in internal units squared. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: U.S. Geological Survey Address: Box 25286, Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 1-800-ASK-USGS Contact_Electronic_Mail_Address: http://ask.usgs.gov/ Resource_Description: Data Series 271 Distribution_Liability: none Standard_Order_Process: Non-digital_Form: Available as one CD. Order from USGS at the address listed or see http://store.usgs.gov/mod/order.html Fees: For current prices of USGS information products, please see http://store.usgs.gov/mod/order.html Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: U.S. Geological Survey Address: Denver Publishing Service Center Address: Denver Federal Center Address: MS 902 Box 25046 City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-4845 Resource_Description: Data Series 271 Distribution_Liability: Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. These data should be directly acquired from a U.S. Geological Survey server, and not indirectly through other sources that may have altered the data in some way. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ASCII Format_Version_Date: 2007 Format_Specification: ASCII export of ArcGIS 9.2 raster dataset File_Decompression_Technique: ZIP archive (Windows) Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/271 Digital_Form: Digital_Transfer_Information: Format_Name: Geodatabase Format_Version_Number: created with ArcGIS 9.2 File_Decompression_Technique: ZIP archive (Windows) Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/271 Fees: none Metadata_Reference_Information: Metadata_Date: 20071017 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Paul Denning Contact_Organization: U.S. Geological Survey Contact_Position: Physical Science Technician Contact_Address: Address_Type: mailing and physical address Address: U.S. Geological Survey Address: Denver Federal Center Address: Box 25046, MS 973 City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-1222 Contact_Facsimile_Telephone: 303-236-3200 Contact_Electronic_Mail_Address: pdenning@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Security_Information: Metadata_Security_Classification_System: None Metadata_Security_Classification: Unclassified Metadata_Security_Handling_Description: None Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile