View to the west of the eastern outcrop of the Santa Cruz Island fault. The middle Miocene Blanca Formation (south=left) is juxtaposed against the Santa Cruz Island Volcanics. This is part of an active left-lateral fault system that continues along the northern margin of Los Angeles basin as the Santa Monica fault. The faults cut the broad (30-50 km), long (200+ km) anticline that makes up the Santa Monica Mountains and northern Channel Islands. The Santa Cruz Island fault represents partitioned slip above a blind thrust fault responsible for the anticline