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