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The three fairly well-defined mature canyons that make up the Concepcion Canyon system are here called Concepcion Canyon A, Concepcion Canyon B, and Concepcion Canyon C, from west to east. Like the Arguello Canyons, the heads of these canyons exhibit collapsed-like geomorphology, although not as well developed as in the Arguello Canyon system. Both Concepcion Canyon A and Concepcion Canyon B have down-canyon moving debris lobes that appear to represent evacuated material from beneath the canyon’s heads. The head of Concepcion Canyon C shows what appears to be the initial stage of a down-canyon debris flow. The best-developed collapse canyon head of these canyons is Concepcion Canyon B. All three heads notch the distal edge of the continental shelf at 100 m water depth. Unlike the Arguello Canyons, lateral failure along the downslope walls of the Concepcion Canyons are not very well developed.
One gully appears east of Concepcion Canyon C and may be an incipient canyon. Several linear depressions are located along the slope beneath the distal edge of the shelf and are oriented parallel or sub-parallel to the canyons. In addition, a series of collapse features exist west of Concepcion Canyon A and may represent an incipient canyon formation.
Drake Canyon, located east of Point Concepcion, heads at the shelf break in about 100 meters water depth. Its upper part is not well defined, but its lower part is sharp in morphology and connects with the lower part of Concepcion Canyon C.
Perspective view from the southwest
|Index Map||Arguello Canyon||Santa Barbara Basin||Rodriguez Seamount|