Darwin drew on measurements by Beagle's officers as well as his own measurements to propose that the plains had been raised in successive stages by forces acting over a wide area, rather than smaller scale actions in a continuous movement.
Darwin valeuse das medidas feitas polos oficiais do Beagle e as súas propias para propoñer que as chairas foran elevadas en sucesivas etapas por forzas que actuaban nunha ampla área, en vez de por accións a menor escala nun movemento continuo.