Realising that soil is caused by erosion of rocks, he also understood that there is a second mechanism creating rocks beneath the surface which are then elevated to form new land.
Realising na lupa ay dulot ng pagguho ng rocks, siya din naiintindihan na may pangalawang mekanismo ng paglikha ng rocks sa ilalim ng ibabaw na kung saan ay nakataas sa form na bagong lupa.