The first rhyncholite (calcified portion of a cephalopod mandible) from rocks of any age in the circum-Pacific belt is described as Rhyncolites sp. The specimen is smaller (4.4 mm long) than most known species of the genus but is morphologically similar to species of comparable age recorded from England, Belgium, Italy, Romania, and Egypt. It was recovered from the middle Eocene Ardath Shale of southern California near San Diego.

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