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.-S., ed.), pp.
All other organic reefs are rather limited in distribution, whereas coral reefs dominate benthic biota in virtually all coastal regions in tropical waters.