organic reef

organic reef

[ȯr′gan·ik ′rēf]
(geology)
A sedimentary rock structure of significant dimensions erected by, and composed almost exclusively of the remains of, corals, algae, bryozoans, sponges, and other sedentary or colonial organisms.
References in periodicals archive ?
Flame shells, which are around 4 cm in length, group together in such numbers that the sea bed is covered by a felt-like organic reef of nest material several centimetres thick.
In The Ancient Organic Reefs of China and their Relations to Oil and Gas (Fan, J.
Structure and composition of organic reefs and carbonate mud mounds: concepts and categories.