Geological observations on South America. Being the third part of the geology of the voyage of the Beagle.

The third and last of Darwin's geological reports on the Beagle voyage. In it he described the pampas, the plateaus and the Andres, showing how they had been gradually pushed up in the way that Charles Lyell surmised without the introduction of catastrophic events. The descriptions of secondary fossil shells from South America, illustrated in Sowerby's plates, are by Edward Forbes.