Light-Toned Deposits in Noctis Labyrinthus (EDM - Natural Colors; credits: Lunexit)

CRISM observations of this Region of the Noctis Labyrinthus formation have shown indications of Iron-bearing Sulfates and Phyllosilicate (such as "clay" ----> argilla) minerals.
HiRISE observations have revealed exposed layers which are possibly the sources of the signatures seen by CRISM.
In this image, the layering can be seen on the right side of the image.
On the lower left, instead, a large Dunefield which covers other beds can also be seen.