This idea was confirmed when the Beagle surveyed the Cocos (Keeling) Islands, and in 1842 he published his theory on The Structure and Distribution of Coral Reefs.
Esta idea considerouna confirmada cando o Beagle examinou as illas Cocos (ou Keeling), e en 1842 publicou a súa teoría sobre A estrutura e distribución dos arrecifes de coral.