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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Eel River (2)
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Eel River basin (2)
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Pacific Ocean
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East Pacific
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Northeast Pacific
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Santa Monica Basin (2)
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North Pacific
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Northeast Pacific
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Santa Monica Basin (2)
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Santa Barbara Basin (2)
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United States
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California
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Del Norte County California (1)
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Humboldt County California (2)
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Los Angeles County California
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Santa Monica Bay (1)
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Northern California (2)
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Santa Barbara County California
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Point Conception (1)
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Southern California (2)
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elements, isotopes
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carbon
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C-14 (3)
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isotopes
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radioactive isotopes
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C-14 (3)
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Cs-137 (1)
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metals
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alkali metals
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cesium
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Cs-137 (1)
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geologic age
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (2)
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upper Quaternary (2)
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Primary terms
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absolute age (3)
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carbon
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C-14 (3)
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (2)
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upper Quaternary (2)
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climate change (1)
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continental shelf (2)
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continental slope (1)
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geophysical methods (1)
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glacial geology (1)
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hydrology (1)
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isotopes
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radioactive isotopes
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C-14 (3)
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Cs-137 (1)
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land use (1)
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metals
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alkali metals
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cesium
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Cs-137 (1)
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Ocean Drilling Program
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Leg 146
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ODP Site 893 (1)
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Leg 167
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ODP Site 1015 (1)
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ODP Site 1017 (1)
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Pacific Ocean
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East Pacific
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Northeast Pacific
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Santa Monica Basin (2)
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North Pacific
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Northeast Pacific
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Santa Monica Basin (2)
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sea-level changes (2)
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sedimentation (4)
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sediments
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clastic sediments
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clay (1)
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silt (1)
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marine sediments (3)
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United States
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California
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Del Norte County California (1)
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Humboldt County California (2)
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Los Angeles County California
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Santa Monica Bay (1)
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Northern California (2)
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Santa Barbara County California
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Point Conception (1)
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Southern California (2)
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sediments
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sediments
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clastic sediments
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clay (1)
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silt (1)
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marine sediments (3)
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Postglacial sedimentary record of the Southern California continental shelf and slope, Point Conception to Dana Point
Sedimentary strata on the Southern California shelf and slope (Point Conception to Dana Point) display patterns and rates of sediment accumulation that convey information on sea-level inundation, sediment supply, and oceanic transport processes following the Last Glacial Maximum. In Santa Monica Bay and San Pedro Bay, postglacial transgression is recorded in shelf deposits by wave-ravinement surfaces dated at 13–11 ka and an upsection transition from coastal to shallow-marine sediment facies. Depositional conditions analogous to the modern environment were established in the bays by 8–9 ka. On the continental slope, transgression is evidenced in places by an increase in sediment grain size and accumulation rate ca. 15–10 ka, a consequence of coastal ravinement and downslope resedimentation, perhaps in conjunction with climatic increases in fluvial sediment delivery. Grain sizes and accumulation rates then decreased after 12–10 ka when the shelf flooded and backfilled under rising sea level. The Santa Barbara coastal cell contains the largest mass of postglacial sediment at 32–42 × 10 9 metric tons, most of which occurs between offshore Santa Barbara and Hueneme Canyon. The San Pedro cell contains the second largest quantity of sediment, 8–11 × 10 9 metric tons, much of which is present on the eastern Palos Verdes and outer San Pedro shelves. By comparison, the mass of sediment sequestered within the Santa Monica cell is smaller at ~6–8 × 10 9 metric tons. The postglacial sediment mass distribution among coastal cells reflects the size of local fluvial sediment sources, whereas intracell accumulation patterns reflect antecedent bathymetric features conducive for sediment bypass or trapping.