In June 1964, an uncharted, flat-topped knoll, rising to a depth of 150 fathoms, was discovered 30 miles east of Cozumel Island, Mexico, by the R/V Oregon. Using a radar buoy for position reference, a series of depth recorder transects was conducted over the structure. A contour chart
of the knoll is presented. The name “Colmer Knoll” is proposed for this structure.
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