Originator: Samuel Y. Johnson
Originator: Stephen R. Hartwell
Originator: Janet T. Watt
Originator: Ray W. Sliter
Title: Sediment Thickness--Salt Point to Drakes Bay, California
Geospatial_Data_Presentation_Form: raster digital data
Originator: Nadine E. Golden
Title: California State Waters Map Series Data Catalog
Series_Name: Data Series
Issue_Identification: DS 781
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
This part of DS 781 presents data for the sediment-thickness map of the Salt Point to Drakes Bay, California, region. The raster data file is included in "SedimentThickness_SaltPointToDrakesBay.zip," which is accessible from http://pubs.usgs.gov/ds/781/SaltPointToDrakesBay/data_catalog_SaltPointToDrakesBay.html
As part of the USGS's California State Waters Mapping Project, a 20-m grid of sediment thickness for the seafloor within the 3-nautical mile limit between Salt Point and Drakes Bay was generated from seismic-reflection data collected in 2009 (USGS activity (S-8-09-NC) supplemented with outcrop and geologic structure from DS 781. The resulting grid covers an area of approximately 717 sq km. The volume of sediment accumulated since the Last Glacial Maximum is approximately 6,800 million cubic meters. Contours at 2.5-meter intervals were derived from this grid.
These data are intended for science researchers, students, policy makers, and the general public. This information is not intended for navigational purposes. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information.
Sediment thickness and volume within each of the map areas
Salt Point 38.639622 38.479620 -123.482704 -123.278809
Fort Ross 38.556494 38.396794 -123.305678 -123.102404
Bodega Bay 38.411542 38.252067 -123.172536 -122.969899
Tomales Point 38.255180 38.095716 -123.097226 -122.895023
Point Reyes 38.098263 37.938810 -123.094511 -122.892742
Drakes Bay 38.038192 37.878737 -122.966411 -122.764735
Map block (sq km) Mean (million cu m)
Salt Point 117 12.5 1464
Fort Ross 100 21.5 2157
Bodega Bay 128 8.5 1084
Tomales Point 108 2.1 230
Point Reyes 175 7.9 1387
Drakes Bay 89 5.3 476
Additional information about the field activities from which this data set was derived are available online at
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
Currentness_Reference: ground condition
Maintenance_and_Update_Frequency: None planned
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: marine geology
Theme_Keyword: seismic reflection methods
Theme_Keyword: maps and atlases
Theme_Keyword: stratigraphic thickness
Theme_Keyword: geospatial datasets
Theme_Keyword: coastal geology
Theme_Keyword: sediment thickness
Theme_Keyword: sediment isopach
Theme_Keyword: seismic-reflection data
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Place_Keyword_Thesaurus: Geographic Names Information System
Place_Keyword: Pacific Ocean
Place_Keyword: State of California
Place_Keyword: Bodega Bay
Place_Keyword: Marin County
Place_Keyword: Sonoma County
Place_Keyword: Point Reyes
This information is not intended for navigational purposes.
Read and fully comprehend the metadata prior to data use. Uses of these
data should not violate the spatial resolution of the data. Where
these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data.
Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.
This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Person: PCMSC Science Data Coordinator
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
Browse_Graphic_File_Description: map of sediment thickness contours
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