Corals meaning

They contain corals, but are not coral reefs.

Japan is not rich in corals and sponges.

C. corals, from the S.

Fossil corals fix the geological age of the rock.

They are ridges of aeolian limestone plastered over by a thin layer of corals and other calcareous organisms. The very remarkable "serpuline atolls" are covered by a solid crust made of the convoluted tubes of serpulae and Vermetus, together with barnacles, mussels, nullipores, corallines and some true incrusting corals.