This photograph (ESP_029146_1500) was taken by NASA’s Mars Reconnaissance Orbiter (MRO) HiRISE Camera on 14 October 2012
NASA describes this photograph as “Gully with Light-Toned Material in Nirgal Vallis in MOC E11-00613.”
I discovered some more strange geological anomalies in this HiRISE photo, these include what look like a pyramid, some monuments, two megaliths and a triangular craft half buried in stand.
Pure speculation as always, these anomalies look like something unnatural and are not specifically something unnatural.
Original NASA source: https://www.uahirise.org/ESP_029146_1500
I downloaded the HiRise B&W Map-Projected JP2 file to view these anomalies.
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