Dataset description: Transgressive Contours--Bolinas to Pescadero, California

This part of DS 781 presents data for the depth-to-transition map of the Bolinas to Pescadero, California, region. The raster data file is included in "TransgressiveContours_BolinasToPescadero.zip," which is accessible from https://pubs.usgs.gov/ds/781/BolinasToPescadero/data_catalog_BolinasToPescadero.html. As part of the USGS's California State Waters Mapping Project, a 50-m grid of sediment thickness for the seafloor within the 3-nautical mile limit between Bolinas and Pescadero was generated from seismic-reflection data collected between 2006 and 2010, supplemented with outcrop and geologic structure (fault) information following the methodology of Wong (2012). Water depths determined from bathymetry data were added to the sediment thickness data to provide information on the depth to base of the post-LGM unit. This polyline shapefile provides the depth-to-transition contours to accompany the grid layer. Reference Cited: Wong, F. L., Phillips, E.L., Johnson, S.Y., and Sliter, R.W., 2012, Modeling of depth to base of Last Glacial Maximum and seafloor sediment thickness for the California State Waters Map Series, eastern Santa Barbara Channel, California: U.S. Geological Survey Open-File Report 2012-1161, 16 p. (available at https://pubs.usgs.gov/of/2012/1161/)

Version	1
Keywords	seismic reflection methods, stratigraphic thickness, geospatial datasets, maps and atlases, marine geology
Data types	Sub Bottom Profiler, Sparker
Format	shapefile;
Amount	0.5 MB

Contacts

Contact	Janet Tilden Watt PCMSC_data@usgs.gov

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Location of materials and files

Public files	https://pubs.usgs.gov/ds/781/BolinasToPescadero/data/TransgressiveContours_BolinasToPescadero.zip https://pubs.usgs.gov/ds/781/BolinasToPescadero/data_catalog_BolinasToPescadero.html https://pubs.usgs.gov/ds/781/
Metadata	https://cmgds.marine.usgs.gov/metadata/pcmsc/SeriesReports/DS_DDS/DS_781/BolinasToPescadero/TransgressiveContours_BolinasToPescadero_metadata.xml Outline - Questions and answers - Text - XML

Activities and equipment

Activity	Equipment
L106SF	Chirp Edgetech
S809NC	sparker shallow-penetrating continuous seismic profiling (3.5-khz system, 150-joule sparker)
S1610NC	chirp
S1610NC	sparker shallow-penetrating continuous seismic profiling (3.5-khz system, 150-joule sparker)
S1510NC	sparker shallow-penetrating continuous seismic profiling (3.5-khz system, 150-joule sparker)
L106SF	minisparker 800 joules minisparker
F207NC	512 chirp is a seismic reflection instrument that uses sound to examine the layering of sedimentary strata on and below the sea floor. The Chirp being used in this project is a modified version of the Subscan 512 made by Edgetech. The noise it makes actually sounds like a bird's chirp; the frequencies of the sound it produces are between 500 Hz and 12 kHz. The Chirp has two advantages that allow it to get excellent penetration (meaning it can see deep, like >50 m or >64 ft, into the seabed) and high resolution (meaning it can make out fine layering, layers
F207NC	sparker shallow-penetrating continuous seismic profiling (3.5-khz system, 150-joule sparker)