According to ehrenberg, this has been extensively the case with the islands in the Red Sea, which formerly ranged parallel to the shores of the mainland, with deep water within them: hence the reefs now coating their bases are situated relatively to the land like barrier-reefs, although not belonging to that class; but there are, as I believe, in the Red Sea some true barrier-reefs.
"Coral-Reefs"
Darwin, Charles
ehrenberg also states, that where there is much sediment, placed so as to be liable to be moved by the waves there is little or no coral; and a collection of living specimens placed by him on a sandy shore died in the course of a few days.
"Coral-Reefs"
Darwin, Charles
With regard to the coral-reefs in the Red Sea, ehrenberg has the following passage:-The living corals do not descend there into great depths.
"Coral-Reefs"
Darwin, Charles
