Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Thickness of sedimentary rocks in thousands of feet. Zero thickness is the edge of the patterned area except on the west coast where the zero line is placed at the foot of the Franciscan series.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Copyright Text: Frezon, S.E., Finn, T.M., and Lister, J.H., 1983, Total thickness of sedimentary rocks in the conterminous United States: U.S. Geological Survey Open-File Report 83–920, scale 1:5,000,000.
http://pubs.er.usgs.gov/usgspubs/ofr/ofr83920