These mysterious-looking formations, located north of Oudemans Crater, might be exhumed ancient dune casts or “ghost dunes.” Based on their size and context these were wind-driven duneforms, which may have been flooded by lava long-ago in the past.

ID: ESP_055692_1720
date: 14 June 2018
altitude: 261 km

https://uahirise.org/hipod/ESP_055692_1720
NASA/JPL-Caltech/UArizona
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