Metadata: Identification_Information: Citation: Citation_Information: Originator: David C. Twichell Originator: VeeAnn A. Cross Publication_Date: 2003 Title: Boomer Seismic Survey Tracklines - Lake Mead 2001 Edition: 1.0 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Open-File Report Issue_Identification: 02-478 Publication_Information: Publication_Place: Woods Hole Field Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Online_Linkage: https://doi.org/10.3133/ofr02478 Larger_Work_Citation: Citation_Information: Originator: VeeAnn A. Cross Originator: David C. Twichell Publication_Date: 2003 Title: Archive of Seismic-Reflection Data Collected During USGS Cruise Lake Mead 01007 in Lake Mead - Nevada and Arizona, 1-28 April, 2001 Edition: 1.0 Series_Information: Series_Name: Open-File Report Issue_Identification: 02-478 Publication_Information: Publication_Place: Woods Hole Field Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Team Online_Linkage: https://doi.org/10.3133/ofr02478 Description: Abstract: Lake Mead is a large interstate reservoir located in the Mojave Desert of southeastern Nevada and northwestern Arizona. It was impounded in 1935 by the construction of Hoover Dam and is one of a series of multi-purpose reservoirs on the Colorado River. The lake extends 183 km from the mouth of the Grand Canyon to Black Canyon, the site of Hoover Dam, and provides water for residential, commercial, industrial, recreational, and other non-agricultural users in communities across the southwestern United States. Extensive research has been conducted on Lake Mead, but a majority of the studies have involved determining levels of anthropogenic contaminants such as synthetic organic compounds, heavy metals and dissolved ions, furans/dioxins, and nutrient loading in lake water, sediment, and biota (Preissler, et al., 1998; Bevans et al, 1996; Bevans et al., 1998; Covay and Leiker, 1998; LaBounty and Horn, 1997; Paulson, 1981). By contrast, little work has focused on the sediments in the lake and the processes of deposition (Gould, 1951). To address these questions, sidescan-sonar imagery and high-resolution seismic-reflection profiles were collected throughout Lake Mead by the USGS in cooperation with researchers from University of Nevada Las Vegas (UNLV). These data allow a detailed mapping of the surficial geology and the distribution and thickness of sediment that has accumulated in the lake since the completion of Hoover Dam. Results indicate that the accumulation of post-impoundment sediment is primarily restricted to former river and stream beds that are now submerged below the lake while the margins of the lake appear to be devoid of post-impoundment sediment. The sediment cover along the original Colorado River bed is continuous and is typically greater than 10 m thick through much of its length. Sediment thickness in some areas exceeds 35 m while the smaller tributary valleys typically are filled with less than 4 m of sediment. Away from the river beds that are now covered with post-impoundment sediment, pre-impoundment alluvial deposits and rock outcrops are still exposed on the lake floor. Purpose: This GIS overlay indicates the tracklines along which boomer seismic-reflection profiles were collected. Supplemental_Information: These data were collected as part of USGS field activity 2001-007-FA. Additional information about that field activity is available from https://cmgds.marine.usgs.gov/services/activity.php?fan=2001-007-FA . Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20010401 Ending_Date: 20010416 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -114.756055 East_Bounding_Coordinate: -114.025819 North_Bounding_Coordinate: 36.484981 South_Bounding_Coordinate: 36.014375 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:1f1afa97-11cb-4fa8-8a0e-7770f420d5fe Theme: Theme_Keyword_Thesaurus: Nonel Theme_Keyword: seismic Theme_Keyword: navigation Theme_Keyword: polyline Theme_Keyword: subbottom Theme_Keyword: boomer Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: Woods Hole Field Center Theme_Keyword: Open-File Report Theme_Keyword: OFR02-478 Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: geospatial datasets Theme_Keyword: seismic reflection methods Theme_Keyword: marine geophysics Theme_Keyword: navigational data Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: inlandWaters Place: Place_Keyword_Thesaurus: None Place_Keyword: Nevada Place_Keyword: Lake Mead Place_Keyword: reservoir Place_Keyword: Hoover Dam Place_Keyword: Boulder Basin Place_Keyword: Virgin Basin Place_Keyword: Gregg Basin Place_Keyword: Overton Arm Place_Keyword: Mohave Desert Access_Constraints: No access constraints. Please see 'Distribution Information' for details. Use_Constraints: These data are marked with a Creative Commons CC0 1.0 Universal License. These data are in the public domain and do not have any use constraints. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: David C. Twichell Contact_Organization: U.S. Geological Survey Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2266 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: dtwichell@usgs.gov Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 3; ESRI ArcCatalog 8.2.0.700 Cross_Reference: Citation_Information: Originator: H.E. Bevans Originator: S.L. Goodbred Originator: J.F. Miesner Originator: S.A. Watkins Originator: T.S. Gross Originator: N.D. Denslow Originator: T. Choeb Publication_Date: 1996 Title: Synthetic organic compounds and carp endrocrinology and histology, Las Vegas Wash and Las Vegas and Callville bays of Lake Mead, Nevada Series_Information: Series_Name: Water-Resources Investigations Issue_Identification: 96-4266 Publication_Information: Publication_Place: Reston, VA Publisher: U.S.Geological Survey Water Resources Cross_Reference: Citation_Information: Originator: H.E. Bevans Originator: M.S. Lico Originator: S.J. Lawrence Publication_Date: 1998 Title: Water quality in the Las Vegas Valley area and the Carson and Truckee River basins, Nevada and California, 1992-1996 Series_Information: Series_Name: Circular Issue_Identification: 1170 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.3133/cir1170 Cross_Reference: Citation_Information: Originator: K.J. Couvay Originator: T.J. Leiker Publication_Date: 1998 Title: Synthetic organic compounds in water and bottom sediment from streams, detention basins, and sewage-treatment plant outfalls in Las Vegas Valley, Nevada, 1997 Series_Information: Series_Name: Open-File Report Issue_Identification: 98-633 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.3133/ofr98633 Cross_Reference: Citation_Information: Originator: H.R. Gould Publication_Date: 1951 Title: Some quantitative aspects of Lake Mead turbidity currents Series_Information: Series_Name: SEPM Society for Sedimentary Geology Special Publication Issue_Identification: No. 2 Publication_Information: Publication_Place: McLean, VA Publisher: SEPM Society for Sedimentary Geology Online_Linkage: https://doi.org/10.2110/pec.51.02.0034 Cross_Reference: Citation_Information: Originator: J.F. LaBounty Originator: M.J. Horn Publication_Date: 1997 Title: The influence of drainage from the Las Vegas Valley on the limnology of Boulder Basin, Lake Mead, Arizona-Nevada Series_Information: Series_Name: Journal of Lake and Reservoir Management Issue_Identification: v. 13, issue 2 Publication_Information: Publication_Place: London, England Publisher: Journal of Lake and Reservoir Management Online_Linkage: https://doi.org/10.1080/07438149709354301 Cross_Reference: Citation_Information: Originator: L.J. Paulson Publication_Date: 1981 Title: Nutrient management with hydroelectric dams on the Colorado River Series_Information: Series_Name: Technical Report Issue_Identification: #8 Publication_Information: Publication_Place: Department of Biological Sciences, University of Nevada, Las Vegas, Nevada Publisher: Lake Mead Limnological Research Center Cross_Reference: Citation_Information: Originator: A.M. Preissler Originator: G.A. Roach Originator: K.A. Thomas Originator: J.W. Wilson Publication_Date: 1998 Title: Water resources data, Nevada, water year 1998 Series_Information: Series_Name: Water Resources Data Nevada Issue_Identification: NV-98-1 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Data_Quality_Information: Logical_Consistency_Report: These data have been checked to remove obviously erroneous data points. Completeness_Report: These data represent the navigation for all the boomer seismic lines collected on this cruise. Lineage: Process_Step: Process_Description: Navigation was acquired and stored with the Hypack navigation system and stored with the boomer seismic data on a Triton-Elics data logger. A unique navigation point was sent to the acquisition system approximately every 10 seconds. These original navigation points are stored in the seismic data as UTM, Zone 11, NAD83 coordinates. The boomer system itself was firing at half second rate. These navigation positions reflect the ship position, and do not reflect the layback of the instrument behind the ship. *The process date was added as a required element when the metadata was updated in 2026. The process date is an assumption based on the process step itself. Process_Date: 2001 Process_Step: Process_Description: This seismic navigation was then extracted from each individual trackline and projected into the geographic coordinate system using PROJ. *The process date was added as a required element when the metadata was updated in 2026. The process date is an assumption based on the process step itself. Source_Used_Citation_Abbreviation: Evenden, 1990, Cartographic Projection Procedures for the UNIX Environment -- A User's Manual: Open-file Report 90-284 Process_Date: 2002 Process_Step: Process_Description: This file was then formatted to represent an Arc/Info generate format so that the lines could be imported into ArcView. *The process date was added as a required element when the metadata was updated in 2026. The process date is an assumption based on the process step itself. Process_Date: 2002 Process_Step: Process_Description: Within ArcView, additional attribute information describing each trackline was added. *The process date was added as a required element when the metadata was updated in 2026. The process date is an assumption based on the process step itself. Process_Date: 2002 Process_Step: Process_Description: This metadata file was updated as part of metadata maintenance when added to the web accessible folder. Edits were performed on the original text version of the metadata, then converted to XML. These edits included: Fixed all errors flagged by MP. These included (but are not limited to) adding required elements such as publication place when publisher is provided; added process dates. Additionally, added some DOI online links when possible; added supplemental information with link to the field activity; added USGS Thesaurus and ISO 19115 Topic Category thesauri and appropriate terms in each; renamed “General” thesauri to “None” thesauri; updated the use and access constraints to approved statements; updated the distribution liability to a current approved statement; updated metadata email to a generic email in the event the person leaves the USGS (20260601) Process_Date: 20260601 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 10 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0002 Longitude_Resolution: 0.0002 Geographic_Coordinate_Units: Decimal degrees 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 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: lm01boom.dbf Entity_Type_Definition: ArcView shapefile attribute table Entity_Type_Definition_Source: ESRI Attribute: Attribute_Label: FID 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: LINENUM Attribute_Definition: A numeric value indicating a line number. Attribute_Definition_Source: VeeAnn A. Cross Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 67 Range_Domain_Maximum: 108 Attribute: Attribute_Label: LENGTH Attribute_Definition: The length of each line segment in meters. Attribute_Definition_Source: Software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2221 Range_Domain_Maximum: 20329 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: FILENAME Attribute_Definition: The filename assigned to the seismic line in the field. Attribute_Definition_Source: Data acquisition technician. Attribute_Domain_Values: Unrepresentable_Domain: character set Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: David C. Twichell Contact_Organization: U.S. Geological Survey Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2266 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: dtwichell@usgs.gov Resource_Description: Downloadable Data Distribution_Liability: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: shapefile Transfer_Size: 0.321 Digital_Transfer_Option: Offline_Option: Offline_Media: These data were released on DVD that is currently not available online. Recording_Format: Not documented with the original metadata. Fees: None Metadata_Reference_Information: Metadata_Date: 20260602 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: U.S. Geological Survey Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov Contact_Instructions: The metadata contact email address is a generic address in the event the contact person is no longer with the USGS. Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998