platform reef

platform reef

[′plat‚fȯrm ‚rēf]
(geology)
An organic reef, generally small but more extensive than a patch reef, with a flat upper surface.
References in periodicals archive ?
Givetian to Famennian (Middle and Late Devonian) platform reef complexes extend over 350 km along the northern margin of the onshore Canning Basin, adjoining Precambrian rocks of the King Leopold Orogen and Kimberley Basin to the north (Playford, 1984).
This platform reef is closed off from the surrounding ocean for 3-5 hours during each low tide (Ludington, 1979).
Both are platform reefs, consisting of a shallow lagoon surrounded by a continuous rim of coral comprising distinctive reef flat, crest, and slope habitats.
Ocean platform reefs: Sampling was conducted west of San Andres and Providencia, at coordinates 12[degrees]30'01" N-81[degrees]45'56" W and 13[degrees]23'54.6" N-81[degrees]23'57" W, respectively.
In the Atlantic Ocean, ripe balao females were collected above platform reefs in 58.0% of sets, above seagrass beds in 25.8% of sets, over bare substrate in 9.7% of sets, and above undefined hard bottom in 6.5% of sets.
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