Sedimentary processes on the Santa Monica Bay (SMB) margin are being studied to understand dispersal pathways of both natural and anthropogenic materials. A suite of 83 box cores collected from 50-800 m water depth were analyzed for ²¹⁰Pb geochronologies, biological mixing rates, sediment texture and sedimentary structure to delineate transport trends on 100-y timescales. Sediment input to SMB appears to be associated with at least two point sources on the shelf, with Malibu Creek and the Hyperion sewage outfall being the most significant. Sediment contributions are sufficient to support apparent mass accumulation rates near these sources up to ~2 g/cm²y, which with distance decrease to ~0.3 g/cm²y near the shelf break (~100 m water depth). Sequestering of material on the shelf and decreasing sediment supply to the slope is evident as rates decrease between 100-200 m water depths to ~0.2 g/cm²y. Below ~200 m water depth, rates are relatively slow and similar (0.06-0.13 g/cm²y). This similarity in rates over such a broad extent suggests that hemipelagic sedimentation is the dominant mechanism of sediment delivery in water depths >200 m. These slower rates are in general agreement with rates determined on the flanks of the California Borderland basins. ²¹⁰Pb rates on the shelf and upper slope are significantly more rapid than < ¹⁴C rates determined for these areas. Biological/physical sediment mixing or downcore textural changes may be responsible for this discrepancy. Geochemical modeling of ²¹⁰Pb and ¹³⁷Cs profiles and textural analyses constrain the importance of these factors and will be discussed.