High-resolution seismic data. Three bathymetrically prominent conduits supply sediment. Seismic profiling data confirm the previously reported erosional character of the channel and constructional nature of flanking levees. Newport Channel is a single well-defined channel with flanking constructional levees where it lies in a structurally controlled trough. The position of Loma sea valley is tightly controlled by the structure of the steep flank of Coronado Bank. The La Jolla Fan comprises a complex interleaved set of sediment wedges derived from multiple sources and woven around the wrench tectonic fabric of uplifts and basins of the Southern California borderland. Expansion from the simple radial growth pattern of fan sedimentation to a complex fan system.--Modified journal abstract.

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