Geology and geomorphology--Offshore of Scott Creek map area, California

Map unit polygons were delineated on the basis of integrated analyses of adjacent onshore geology with multibeam bathymetry and backscatter imagery, seafloor-sediment and rock samples, digital camera and video imagery, and high-resolution seismic-reflection profiles.

The mapped area was extended to the shoreline by using digital orthophotos to interpret the region between the inner edge of the multibeam bathymetry and the approximate shoreline. The approximate shoreline was generated at the NAVD88 +1.46 m contour, defined as the operational MHW shoreline by Weber and others (2005). The resulting boundary was transformed to WGS 84 UTM Zone 10 North in ArcGIS 10 using the NAD83 to WGS84 (ITRF00) transformation algorithm. This boundary was then used to extend and trim both onshore and offshore geology in the print and PDF product. The transformed boundary is contained within the WGS84 "contours" feature class and identified as a water boundary in the associated representation rules.
Only data for offshore map units are released digitally in this publication. For onshore geology (Offshore and Onshore Geology and Geomorphology, Offshore of Scott Creek Map Area, California), see Brabb (1980), Brabb and others (1998), California Geological Survey (1982, 2002), Weber and Lajoie (1980), and Witter and others (2006).
References Cited:
Brabb, E.E., 1980, Preliminary Geologic Map of the La Honda and Scott Creek Quadrangles, San Mateo County, California: U.S. Geological Survey Open-File Report 1980-0245, scale 1:24,000.
Brabb, E.E., Graymer, R.W., and Jones, D.L., 1998, Geology of the Onshore Part of San Mateo County, California: A Digital Database: U.S. Geological Survey Open-File Report 98`-137, scale 1:62,500.
California Geological Survey, 1982, Alquist-Priolo Earthquake Fault Zone Map of Franklin Point quadrangle, scale 1:24,000.
California Geological Survey, 2002, CD 2002-01, Fault Evaluation Reports prepared under the Alquist-Priolo Earthquake Fault Zoning Act, Region 1, Central California.
Weber, K.M., List, J.H., and Morgan, K.L., 2005, An operational Mean High Water datum for determination of shoreline position from topographic lidar data: U.S. Geological Survey Open-File Report 2005-1027, available at http://pubs.usgs.gov/of/2005/1027/.
Weber, G.E., and Lajoie, K.R., 1980, Map of Quaternary Faulting along the Scott Creek Fault Zone, San Mateo and Santa Cruz Counties, California: U.S. Geological Survey Open-File Report 1980-0907, scale 1:24,000.
Witter, R.C., Knudsen, K.L., Sowers, J.M., Wentworth, C.M., Koehler, R.D., Randolph, C.E., Brooks, S.K., and Gans, K.D., 2006, Maps of Quaternary Deposits and Liquefaction Susceptibility in the Central San Francisco Bay Region, California, U.S. Geological Survey Open-File Report 06-1037, scale 1:24,000.

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