Southern Santa Cruz Mountains
33 3. Field Trip to Lexington Reservoir and Loma Prieta Peak Area in the Southern Santa Cruz Mountains Trip Highlights: San Andreas Rift Valley, Quaternary faults, Stay in the right lane and exit onto Alma Bridge Road. Follow landslide deposits, Franciscan Complex, serpentinite, stream Alma Bridge Road across Lexington Reservoir Dam and turn terrace deposits, Lomitas Fault, Sargent Fault, Cretaceous fos- right into the boat dock parking area about 0.6 mile (1 km) sils, deep-sea fan deposits, conglomerate from the exit on Highway 17 north. A Santa Clara County Parks day-use parking pass is required to park in the paved lot. This field trip examines faults, landslides, rocks, and The park day use pass is $5. Vehicles can be left here for the geologic features in the vicinity of the San Andreas Fault and day to allow car pooling (the park is patrolled, but as always, other faults in the central Santa Cruz Mountains in the vicinity take valuables with you). of both Lexington Reservoir and Loma Prieta Peak (fig. 3-1). Detailed geologic maps, cross sections, and descriptions The field trip begins at Lexington Reservoir Dam at the boat featuring bedrock geology, faults, and landslide information dock parking area. To get to Lexington Reservoir Dam, take useful for this field-trip area are available on-line at theUSGS Highway 17 south (toward Santa Cruz). Highway 17 enters San Francisco Bay Region Geology website [http://sfgeo. Los Gatos Creek Canyon about 3 miles (5 km) south of the wr.usgs.gov/]. McLaughlin and others (2001) have produced intersection of highways 85 and 17.
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