Process_Description:
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, see California Geological Survey (1974), Fuller and others (2002), Huffman (1972), Manson and others (2006), and Witter and others (2006).
References Cited:
California Geological Survey, 1974, Alquist-Priolo Earthquake Fault Zone Maps of Annapolis and Plantation quadrangles, scale 1:24,000.
Fuller, M.S., Haydon, W.D., Purcell, M.G., and Custis, K., 2002, Geologic and geomorphic features related to landsliding, Gualala River watershed, Sonoma and Mendocino counties, California: California Geological Survey Watershed Mapping Series, Map Set 5, Plate 1, Sheet 3 of 3, scale 1:24,000.
Huffman, M.E., 1972, Geology for planning on the Sonoma County coast between the Russian and Gualala Rivers: California Division of Mines and Geology Preliminary Report 16, 38 p., 4 plates, scale 1:24,000.
Manson, M.W., Huyette, C.M., Wills, C.J., Huffman, M.E., Smelser, G.G., Fuller, M.E., Domrose, C., and Gutierrez, C., 2006, Landslides in the Highway 1 corridor between Bodega Bay and Fort Ross, Sonoma County, California: California Geological Survey Special Report 196, 26 p., 2 plates, 38 maps, scale 1:12,000.
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.
Process_Date: 2011