Present landscapes have evolved through the Tertiary and Quaternary, and often retain the imprint of former sub-aerial and marine processes. These operated under a variety of environmental regimes different from those presently observable, and related to different base-level conditions controlled by eustatic, tectonic and isostatic changes in the relative elevation of land and sea. Geomorphometry has developed one branch whose objective is the identification and correlation of remnants of formerly more extensive erosional and depositional surfaces associated with these processes, in order to provide a quantitative basis for reconstructing the geomorphological history of an area.