The very top of this image shows the edge of ancient lava flow that went no further across the plain. It’s also a natural boundary in the reflectivity (albedo) of the surface.

ID: ESP_055232_1595
date: 9 May 2018
altitude: 255 km

https://uahirise.org/hipod/ESP_055232_1595
NASA/JPL-Caltech/UArizona
#Mars #science #NASA