This depression resembles one in a 2011 picture with possible lingering summertime frost. There are also some odd linear ridge structures. A closer look can help us see if there is similar frost here as well as examining the nature of the floor materials.
ID:
ESP_057901_1235date: 3 December 2018
altitude: 248 km
https://uahirise.org/hipod/ESP_057901_1235
NASA/JPL-Caltech/UArizona
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