A continuous 220 km long anticline underlies the Santa Monica Mountains and northern Channel Islands of southern California. This fold has been explained as the result of slip on a ramp in a blind thrust fault. Here we investigate the part of that structure including northwest Santa Rosa Island and southwest Santa Barbara basin. A U.S. Geological Survey (USGS) multichannel seismic reflection profile, USGS-808 was reprocessed and output in migrated depth and time. This profile, an industry multichannel profile, and numerous USGS high resolution reflection profiles were correlated to petroleum test well logs and to published data from Ocean...