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Title: Transgressive Contours: Salt Point to Drakes Bay, California, 2009

• Watt, Janet T.
• Hartwell, Stephen R.
• Johnson, Samuel Y.
• Sliter, Ray W.
• Pacific Coastal and Marine Science Center

Dates

• Issued: 2014
• Coverage: 2009

Publishers

• Geological Survey (U.S.)

Summary

This line shapefile contains transgressive contours at 5 and 10 meter intervals for the area within the 3-nautical mile limit between Salt Point and Drakes Bay in California. As part of the USGS's California State Waters Mapping Project, a 20-m grid of depth to the transgressive surface of the last glacial maximum was generated for the 3-mile offshore region. The resulting grid covers an area of approximately 550 sq km. The depth to the transgressive surface of the Last Glacial Maximum ranges between 0 and 102 meters. This layer is part of USGS Data Series 781. In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP) to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats and geology within the 3-nautical-mile limit of California's State Waters. CSMP has divided coastal California into 110 map blocks, each to be published individually as United States Geological Survey Open-File Reports (OFRs) or Scientific Investigations Maps (SIMs) at a scale of 1:24,000. Maps display seafloor morphology and character, identify potential marine benthic habitats and illustrate both the seafloor geology and shallow (to about 100 m) subsurface geology. Data layers for bathymetry, bathymetric contours, acoustic backscatter, seafloor character, potential benthic habitat and offshore geology were created for each map block, as well as regional-scale data layers for sediment thickness, depth to transition, transgressive contours, isopachs, predicted distributions of benthic macro-invertebrates and visual observations of benthic habitat from video cruises over the entire state. 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. Johnson, S.Y., Hartwell, S.R., Watt, J.T., and Sliter, R.W. (2014). Transgressive Contours: Salt Point to Drakes Bay, California, 2009. California State Waters Map Series Data Catalog: U.S. Geological Survey Data Series 781. Available at: http://purl.stanford.edu/mx615hn8123. 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 > depth to transgressive surface > Area > Map block (sq km) MIN MAX MEAN STD > Salt Point 117 -110.0 -0.2 -82.8 21.7 > Fort Ross 100 -102.1 0.0 -65.6 26.0 > Bodega Bay 128 -100.7 2.2 -52.2 28.3 > Tomales Point 108 -86.5 -4.4 -49.2 19.5 > Point Reyes 175 -89.5 -0.1 -52.1 22.7 > Drakes Bay 89 -75.8 -1.1 -38.0 12.2 Additional information about the field activities from which this data set was derived are available online at > http://walrus.wr.usgs.gov/infobank/s/s809nc/html/s-8-09-nc.meta.html 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. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

Subjects

• Oceans
• Elevation
• California
• Marin County (Calif.)
• Sonoma County (Calif.)
• Bodega Bay (Calif.)
• Drakes Bay (Calif.)
• Ocean bottom
• Contours (Cartography)
• Geoscientific Information
• Datasets

Geospatial coordinates

• Bounding Box: BBOX (-123.471221, -122.764858, 38.639286, 37.87171)
• Geometry: BBOX (-123.471221, -122.764858, 38.639286, 37.87171)

Provider

Stanford

Rights

• Access rights: Public

Citation

Watt, Janet T., Hartwell, Stephen R., Johnson, Samuel Y., Sliter, Ray W., Pacific Coastal and Marine Science Center. Transgressive Contours: Salt Point to Drakes Bay, California, 2009. Geological Survey (U.S.). Line data. https://purl.stanford.edu/mx615hn8123

Format

Shapefile

Languages

• English