noun pa·limp·sest \ˈpa-ləm(p)-ˌsest, pə-ˈlim(p)-\. : a very old document on which the original writing has been erased and replaced with new writing. Something reused or altered but still bearing visible traces of its earlier form.
“Landforms may be combinations of different elements - either separate patches of different age and origin thus recording landform history, or combined together and over-printed in complex ways as palimpsests”
Kenneth J Gregory & John Lewin
The Basics of Geomorphology