The contacts between these low hills and the smooth plains (almost certainly lava) are strangely pitted and fractured. Why? Was this caused by invasive lava effects or some sort of lava-water interaction or another as yet unknown process?

ID: ESP_035599_1835
date: Saturday, 1 March 2014
altitude: 274 km (169.88 mi)

https://uahirise.org/hipod/ESP_035599_1835
NASA/JPL-Caltech/University of Arizona
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