Reef knoll
Landform of calcareous material accumulated on an ancient seabed. / From Wikipedia, the free encyclopedia
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A reef knoll is a landform that comprises an immense pile of calcareous material that had previously accumulated on an ancient sea floor.[1] Reef knolls are geological remnants of reefs and other organic concentrations of calcareous organisms. Reef knolls are often fossil-rich, with prehistoric corals, sponges, calcareous algae, and other reef-builders contributing to a large portion of the structure's volume. This density of skeletal material allows the structure to withstand sea currents and stand freely.
Reef knolls can be divided into bioherms and biostromes. A bioherm is a landform of organic sedimentary rock enclosed or surrounded by rock of different origin.[2] A biostrome is a distinctly bedded or broadly lenticular sedimentary rock landform.[3] Krumbein additionally used these terms to distinguish different shapes of stromatolites: "Distinctly bedded, widely extensive, blanketlike build-ups are biostromes. Nodular, biscuit-like, dome-shaped or columnar stromatolites are also referred to as bioherms".[4]