reef knoll

reef knoll

[′rēf ‚nōl]

(geology)

A bioherm or fossil coral reef represented by a small, prominent, rounded hill, up to 330 feet (100 meters) high, consisting of resistant reef material, being either a local exhumation of an original reef feature or a feature produced by later erosion.

A present-day reef in the form of a knoll; a small reef patch developed locally and built upward rather than outward.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.