Crater in its final stage of degradation.
In the broadest sense, any impact crater that is only barely decipherable by photogeologic methods. In a more strict sense, a buried and/or subdued impact crater with circular outline (relict rim) is still visible (a ring ridge). (This definition does not include palimpsests on icy bodies which are not buried nor eroded.)
Buried ghost crater: Completely buried crater whose rim deforms the overlying materials forming a circular ridge. Examples of material burying the crater: lava, sediment, or ejecta. Fresh craters partially flooded by lava may display a sharp ring ridge on a flat surface (Figs. 1, 2, and 5).
Eroded ghost crater: Degraded by subsequent impacts (e.g., ruined craters, topographic basin) or other erosional process (eroded crater). Eroded craters may appear as rimless...
KeywordsImpact Crater Mare Basalt Lunar Mare Late Heavy Bombardment Wrinkle Ridge
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