Geological Observations on South America

by Charles Darwin

Broderip, Mr., on elevated shells from Concepcion.

Brown, Mr. R., on silicified wood of Uspallata range.

Brown, on silicified wood.

Bucalema, elevated shells near.

Buch, Von, on cleavage. —on cretaceous fossils of the Cordillera. —on the sulphureous volcanoes of Java.

Buenos Ayres.

Burchell, Mr., on elevated shells of Brazil.

Byron, on elevated shells.

Cachapual, boulders in valley of.

Caldcleugh, Mr., on elevation of Coquimbo. —on rocks of the Portillo range.