algal reef

algal reef

[′al·gəl ‚rēf]
(geology)
An organic reef which has been formed largely of algal remains and in which algae are or were the main lime-secreting organisms.
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References in periodicals archive ?
Tufas are the fossilized remnants of fresh-water algal reefs that lived under water in the lakes.
2 billion-year-old mud cracks, 800-million-year old algal reefs, and 270-million-year-old fossils.
Users of the publicly available maps can immerse themselves in vast underwater dune fields, observe a huge landslide over 20 kilometres wide in the Cairns region, or see the extensive algal reefs on the northern Great Barrier Reef shelf.
With a wide array of well-chosen illustrations and photographs Bird describes coastal processes such as waves and tides, land and sea level changes and their causes, cliffs (and their relation to landslides), shore platforms, including plunging cliffs, beaches in all their amazing variety, beach erosion and nourishment, coastal dunes, intertidal wetlands, estuaries and lagoons, deltas, coral and algal reefs, and the coasts to emerge in the future from the changing climate.