United States Coast and Geodetic Survey ; from a trigonometrical survey under the direction of A.D. Bache, Superintendent of the Survey of the Coast of the United States ; triangulation by R.D. Cutts, G.A. Fairfield, G. Davidson, assists. and A.F. Rodgers, sub-assist. ; topography by R.D. Cutts, asst. & A.F. Rodgers, sub-asst. ; hydrography by the party under the command of Commander James Alden, U.S.N. assist. Relief shown by hachures. Depths shown by soundings and shading. "Redd. drng. by A. Lindenkohl, J.J. Ricketts & A. Balbach." "Engd. by J. Knight, G.B. Metzeroth, A. Blondeau & W. Ogilvie." "Plate no. 1006." "Electrotype copy no. 1 by G. Mathiot, U.S.C.S." Inset map: Sub-sketch continuation of Straits of Karquines. Scale 1:50,000. Inset views: View of the entrance to Karquines Straits and vicinity from near Penole Pt -- View of the entrance to San Francisco Bay from near Penole Pt. Includes text and tables.