HiRISE image of sedimentary rock layers on a crater floor in the southern hemisphere of Mars (20th of May 2015).
The Martian Chronicles
A One-Kilometer Crater on the Floor of Saheki Crater
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Mars Panoramas - 'Got Places To Go and People To See'
All about Mars
MRO image of the side of a crater on Mars.
Possible "mud volcanoes" on Mars, image via HiRISE
Layers of rock on Mars.
Periodic Layering in Martian Sedimentary Rocks from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter
Crater water ice on Mars
HiRISE Image: Round Mounds Near the Argyre Region on Mars