Davis Seaknoll is a small volcanic cone at the extreme outer margin of Arguello Plateau off Point Conception, California. If the deep, relatively flat plateau is a foundered erosional surface, the seaknoll must postdate the period of truncation. Acoustic-reflection studies have disclosed a broad, nearly level surface beneath a relatively thin (80-m) veneer of unconsolidated sediments. Correlation of Davis Seaknoll with near-by Rodriguez Seamount suggests that the outer Arguello Plateau was a bank prior to subsidence which began in prelate Miocene time.

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