These enigmatic mounds are on the floor of an unnamed impact crater in Bosphorous Planum, south of Valles Marineris . Are they the products of sublimation and crater inversion?

ID: ESP_056786_1440
date: Friday, 7 September 2018
altitude: 249 km (154.38 mi)

https://uahirise.org/hipod/ESP_056786_1440
NASA/JPL-Caltech/University of Arizona
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