The process of sublimation in these scallop-shaped depressions is probably much too slow to be seen, but we can still look for wind-caused changes that may be relevant to their formation. A small, low-albedo (sand-filled?) pit in one of the major depressions might be the most likely to change.

ID: ESP_064072_2265
date: 28 March 2020
altitude: 301 km

https://uahirise.org/hipod/ESP_064072_2265
NASA/JPL-Caltech/UArizona
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