1. Continental-Margin Sedimentation during High Sea Level Fluvial and glacial valleys flooded Sediments trapped in river-mouth estuaries and fjords If much sediment supplied, estuaries and fjords are filled deltas formed Sediment can escape to continental shelf mud winnowed by waves leaving sand nearshore mud transported to middle shelf On collision margins (narrow, steep shelf) sediment can escape to continental slope

2. Holocene deposits (<20,000 y) on continental shelves Note: boundary between modern inner-shelf sand and modern mid-shelf mud depends on waves

3. Washington continental shelf

5. Continental-Margin Sedimentation during High Sea Level Fluvial and glacial valleys flooded Sediments trapped in river-mouth estuaries and fjords If much sediment supplied, estuaries and fjords are filled deltas formed Sediment can escape to continental shelf mud winnowed by waves leaving sand nearshore mud transported to middle shelf On collision margins (narrow, steep shelf) sediment can escape to continental slope

6. 41 o 00’ 40 o 50’ 40 o 40’ 124 o 40’ 124 o 30’ 7 0 0 6 0 0 5 0 0 4 0 0 3 5 0 3 0 0 2 5 0 2 0 0 1 5 0 1 0 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 Eel River Drainage Basin ~9000 km 2 Study Area 0 m 350 1400 Elevation California Eel margin

7. Eel Canyon, northern California Multiple entrants that are presently receiving sediment and experience many turbidity currents each year

11. L1C12 DUPLICATE CORES L1C13 L1C12 Larry Channel Thalweg  = 137 m