Geomorphologically the young alluvial fan is characterized by subrounded and unvarnished clasts, distributary and braided drainage pattern and relatively flat morphology. Old and relict fans are characterized by incised and rough morphology, tributary drainage patterns and highly weathered and varnished clasts due to the longer term exposure to weathering. The higher porosity and lower density of aggregates on old and relict fans is the result of longer term weathering of fan surfaces.