Download this stock image: Ecuador, Perú CuyabenoGüeppí (2008) Ecuador, Perú : CuyabenoGüeppí ecuadorpercuyab202008alve Year: 2008 Fig. 32. Formation and redistribution of Andean gravels and sands into soils and stream systems of the CuyabenoGüeppí region. Erosion slowly deepens the valleys while processes of bioturbation (mixing caused by burrowing organisms) .