Coral Reefs; Volcanic Islands; South American Geology — CompleteNote 20 — Chapter III · ON THE PLAINS AND VALLEYS OF CHILE:—SALIFEROUS SUPERFICIAL DEPOSITS.Reading editionM. d’Orbigny’s “Voyage,” etc., Part. Hist., tome i, p. 664.◇Copy noteReturn to Chapter III ON THE PLAINS AND VALLEYS OF CHILE:—SALIFEROUS SUPERFICIAL DEPOSITS.