If their ancestors had been carried out to sea once or twice by a flood and safely drifted as far as the Galapagos Islands" (Wallace), "they must have been numerous on the continent" (Rothschild and Hartert).
Diatom ooze has been found in detached areas between the Philippine and Mariana islands, and near the Aleutian and Galapagos groups, forming an exception to the general rule of its occurrence only in high latitudes.
The following islands may be classified as oceanic, but not with any of the three main divisions: the Bonin Islands, north of the Marianas, belonging to Japan; Lord Howe and Norfolk Islands (to New South Wales); Easter Island (to Chile); the Galapagos Islands (to Ecuador).
The Galapagos Islands are of some commercial importance to Ecuador, on account of the guano and the orchilla moss found on them and exported to Europe.
The origin and development of these conditions, in islands so distinctly oceanic as the Galapagos, have given its chief importance to this archipelago since it was visited by Darwin in the "Beagle."