Maps and posters related to San Francisco Bay sand and mud, produced by USGS.
This map consists of a view of the southern end of San Francisco bay with the water "removed." The image is overlain by a set of six different perspective views of the area.
U.S. Geological Survey (USGS) Scientific Investigations Map 2944
A multibeam bathymetric survey, conducted in 2004 and 2005, produced unprecedented high resolution images of the mouth of San Francisco Bay. The goals of this survey were to analyze sediment transport pathways at the mouth of San Francisco Bay and to calculate bathymetric change since the last survey was completed in 1956. The survey showed that significant bathymetric changes have occurred over the past 50 years. It also revealed that the study area contains sand waves that are among the largest and bedform morphologies that are among the most varied in the world. This set of five sheets shows views of the sand waves on the seafloor from different perspectives along with descriptive text.
USGS Scientific Investigations Map 2944 contains 5 large posters, or "sheets", shown above. Each sheet (PDF) ranges in size from 3-12 MB.