{ "currentVersion": 10.61, "id": 3, "name": "Geology_OffshoreScottCreek", "type": "Feature Layer", "description": "This part of DS 781 presents data for the geologic and geomorphic map of the Offshore of Scott Creek map area, California. The vector data file is included in \"Geology_OffshoreScottCreek.zip,\" which is accessible from http://dx.doi.org/10.5066/F7CJ8BJW.\nThe offshore part of the map area lies southwest of the southwest flank of the Santa Cruz Mountains, extending from the shoreline to water depths of about 60 to 75 m on the gently dipping (about 0.6° to 0.8°) continental shelf. The shelf is underlain by Neogene bedrock and a variably thick (as much as 24 m) late Quaternary sediment cover. Sea level has risen 120 to 130 m over about the last 21,000 years, leading to broadening of the continental shelf, progressive eastward migration of the shoreline and wave-cut platform, and associated transgressive erosion and deposition. The Offshore of Scott Creek map area is now an open-ocean shelf that is subjected to full, and sometimes severe, wave energy. Shelf morphology and geology are also affected by local faulting, folding, uplift, and possibly subsidence.\nThe offshore of Scott Creek map area straddles the right-lateral San Gregorio Fault Zone, an important structure in the distributed transform boundary between the North American and Pacific plates. Regionally, this fault is part of a system that occurs predominantly in the offshore for about 400 km from Point Conception in the south to Bolinas and Point Reyes in the north. The San Gregorio Fault in the map area is part of a 90-km-long offshore segment that extends from Point Sur on the south, across outer Monterey Bay to Point Año Nuevo. Offshore parts of this fault system are identified on seismic-reflection data based on abrupt truncation or warping of reflections and (or) juxtaposition of reflection panels with different seismic parameters. In this map area, the San Gregorio Fault forms a distributed about 2-km-wide shear zone that includes two main faults. The nearshore eastern part of the zone, which includes the Coastways Fault, partly coincides with a prominent bathymetric lineament on the outer flank of nearshore bedrock outcrops between Waddell Creek and Davenport. The western part of the zone, which includes the Frijoles Fault, cuts across the flat, sediment-covered shelf. Cumulative lateral slip on San Gregorio Fault Zone in this region is thought to range from 4 to 10 mm/yr. \nMcCulloch (1987) considered the San Gregorio Fault Zone the eastern margin of the Outer Santa Cruz Basin. Farther offshore, outside California's State Waters but within the map area, this basin is cut by the northwest-trending Ascension Fault.\nEmergent marine terraces on the flanks of the Santa Cruz Mountains between Santa Cruz and Point Año Nuevo are as high as 240 m with estimated uplift rates that range from about 0.2 m/year to as much as 1.1 mm/yr. This uplift has been attributed to a combination of (1) advection of crust around a bend in the San Andreas Fault, and (2) uplift on the northeast (landward) side of a steep-northeast dipping offshore San Gregorio fault. The uplifted region in this tectonic model includes the nearshore and shelf of the Offshore of Scott Creek map area, but considerable shore-normal uplift gradients are associated with both processes and offshore uplift rates are not well constrained. \nMap unit polygons were digitized over underlying 2-meter base layers developed from multibeam bathymetry and backscatter data. 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