It’s a good bet these are indications of glacial flow. Reull Vallis is thought to have formed when running water flowed in the distant past, cutting a steep-sided channel through the Promethei Terra highlands before running on towards the floor of the vast Hellas Basin.

ID: ESP_055276_1385
date: 12 May 2018
altitude: 252 km

https://uahirise.org/hipod/ESP_055276_1385
NASA/JPL-Caltech/University of Arizona
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