These little mesas are most likely erosional remnants of the unit which caps Ganges Mensa further to the west. Ganges Mensa is itself a mesa that rises up 4 kilometers from the floor of Ganges Chasma, one of the peripheral valleys of Valles Marineris. A digital terrain model would allow measurements of layering all the way around one of these mesas.

ID: ESP_011582_1730
date: 14 January 2009
altitude: 268 km

https://uahirise.org/hipod/ESP_011582_1730
NASA/JPL-Caltech/UArizona
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