This image suggestion outlines a contact between gypsum-rich dunes in Olympia Undae and flat-lying layers of the basal (or bottom) unit. Our goal is to look for a stratigraphic and compositional comparison between the dunes and the basal unit.
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Image: NASA/JPL/University of Arizona https://www.uahirise.org/hipod/ESP_070833_2605
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Elongated Dunes
These lovely linear dunes at Meroe Patera identified in Context Camera images that have developed in a sand starved region of the dune field, elongating from behind a cliff.
Active High-Latitude Dune-Gullies
Gully and defrosting activity have been visible here along the edge of a dune field, along with blocks of frost.
A Rising Ridge
This obsevation focuses a ridge that is standing above the old lava surface of the floor of Echua Chasma.
A Flow near Huo Hsing Vallis
The lava appears to overlay sand and sedimentary deposits, so finer scale This image shows a potential outflow channel near Huo Hsing Vallis into an old crater.