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Numerous mine exposures, drillholes and marine seismic profiles have facilitated detailed study of the Late Cainozoic alluvium in Peninsular Malaysia. In 1979, Daud Batchelor, building on the work of D. Walker and others proposed a regional Late Cainozoic stratigraphic scheme incorporating the traditional division of "Old Alluvium" and "Young Alluvium", and correlated Indonesian offshore units of Aleva and others. The important distinction between Old Alluvium (OA) and Young Alluvium (YA) in presently emergent areas of the Sundaland continent shows that the OA comprises less well sorted generally aggrading alluvial fan/plain deposits of broad palaeochannel systems while the YA infills V-shaped valleys incising the palaeo-landscape. These units reflect a major intervening palaeogeomorphological change.