reef knoll

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

Related terms:

• reef flank
• sea knoll
• table knoll
• patch reef
• knoll
• platform reef
• reef patch
• reef detritus
• reef talus
• reef milk