Back in Valparaiso, Darwin set out on another trek up the Andes and on 21 March reached the continental divide at 13,000 ft (4,000 m): even here he found fossil seashells in the rocks.
De volta en Valparaíso, Darwin partiu noutra expedición aos Andes e o 21 de marzo chegou á divisoria de augas continental a 4 000 m de altura: incluso aquí atopou cunchas mariñas fósiles ns rochas.