The CRISM instrument on MRO (a spectrometer) has detected clay deposits here that is a very uncommon sedimentary setting.

ID: ESP_054924_2125
date: Sunday, 15 April 2018
altitude: 292 km (181.04 mi)

https://uahirise.org/hipod/ESP_054924_2125
NASA/JPL-Caltech/University of Arizona
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