Fluvial erosion, through backward erosion combined with a periglaciar intense activity, determined these types of crests (in Papusa-Batrana-Rosu-Mount Vacarea crest-Crucea Ateneului-Iezerul Mare-Iezerul Mic).
On the east side of Rausor Lake, the versants are modified by actual landform processes: gully erosion, sheet erosion, backward erosion, in Valea Larga, Izvorul Lespezi and Vacarea sectors with alluvial fans.