Maps. California. Columnar sections showing correlation and subdivisions of Tertiary and late Upper Cretaceous rocks, in Panoche Hills, Laguna Seca area, and Orestimba area, Fresno, Merced, and Stanislaus Counties, Calif.; oil and gas investigations, preliminary chart 6 [with text] by Ralph Stewart, W. P. Popenoe, and P. D. Snaveley, jr. Vertical scale 1,000 ft.=5 in.