Volcanic Islands

by Charles Darwin

Coast denudation at St. Helena.

Columnar basalt.

“Comptes Rendus,” account of volcanic phenomena in the Atlantic.

Concepcion, earthquake of.

Concretions in aqueous and igneous rocks compared. -in tuff. -of obsidian.

Conglomerate, recent, at St. Jago.

Coquimbo, curious rock of.

Corals, fossil, from Van Diemen’s Land.

Crater, segment of, at the Galapagos. -great central one at St. Helena. -internal ledges round, and parapet on.

Craters, basaltic, at Ascension. -form of, affected by the trade wind. -of elevation. -of tuff at Terceira. -of tuff at the Galapagos archipelago. -their breached state. -small basaltic at St. Jago. —at the Galapagos archipelago.