The madrepore stone is found among the fossil productions of Ashton.
It occurs in the Dublin limestone, and resembles a coral or madrepore.
One need only glance at the photographs of osmotic productions to recognize the forms of madrepore, fungus, alga, and shell.
All around is a sea of mounds covered with sand, where the houses stood, mostly built of madrepore, and laid out in streets.
It is in fact of the shape of a goblet, and its substance is intermediate between that of a sponge and a madrepore.
The madrepore pier had been nearly swept away, and the houses near the water were flooded.
The madrepore corals are called reef-builders, but not in the sense of constructors of reefs.
Finally, as a last despairing effort, I took a pencil and began to make a sketch of a madrepore.
Third picture: in shallow seas have sprung up isles of madrepore; a cluster of palm trees overhangs them here and there.
Many of these limestones owe their beauty to the fossil corals which they contain, and are hence known as “madrepore marbles.”