Palimpsest (planetary astronomy)

As a ghost crater is an ancient impact crater in astronomy refers to the crater wall is removed almost entirely by long-term erosion and is visible at very shallow Sun only (see pictures).

Younger stroke may lead to over embossing of the old structures, but can be tracked by their rock typical spectral properties with special methods often. The planetary scientist Eugene Shoemaker therefore it is also called palimpsests - analogous to the overwritten parchments in archeology.