Datasets > Raster data > California > 2005-2009

Depth to Transition: Salt Point to Drake's Bay, California, 2009

Geological Survey (U.S.) · 2009 Full Details

Full Details

Title
Depth to Transition: Salt Point to Drake's Bay, California, 2009
Description
This layer is a georeferenced raster image of the depth to transition (base) map of uppermost Pleistocene and Holocene sediments in the region of Salt Point to 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 (LGM) was generated for the areas within the 3-nautical mile limit between Bolinas and Pescadero. Information for the depth to base of the post-LGM unit was generated by adding sediment thickness data to water depths determined by multibeam bathymetry. The resulting grid covers an area of approximately 550 sq km. The depth to the transgressive surface of the LGM ranges between 4 and 78 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., This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
Creator
Pacific Coastal and Marine Science Center, Chin, John L., Johnson, Samuel Y., Ross, Stephanie L., Sliter, Ray W.
Publisher
Geological Survey (U.S.)
Subject
Coasts, Sediments (Geology), Marine sediments, Ocean bottom, Seismic reflection method, Imagery and Base Maps, Oceans, Elevation
Temporal Coverage
2009
Date Issued
2014
Rights
This item is in the public domain. There are no restrictions on use.
Rights Holder
This work is in the Public Domain, meaning that it is not subject to copyright.
Access Rights
Public
Format
GeoTIFF
Language
English
Date Added
October 01, 2025

Location

Cite and Reference

  • Citation
    Pacific Coastal and Marine Science Center, Chin, John L., Johnson, Samuel Y., Ross, Stephanie L., Sliter, Ray W. (2014). Depth to Transition: Salt Point to Drake's Bay, California, 2009. Geological Survey (U.S.). (dataset)
  • BTAA Geoportal Link

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