Notice the black threads superimposed within some of the snow-filled gullies. These are my active springtime flows.
The white stuff is CO2 ice and snow. Darker stuff is dust-covered ice or frozen ground (probably mostly H2O ice, but some CO2 as well)
The flat-looking lake-like body is probably the morphological equivalent of a Playa - a flat area where depositional processes at the foot of slope have smoothed the surface. It need not be horizontal - and in fact is probably subtly curved and dish-shaped (but oval, not round).
There is no liquid water in this shot. TES average temperatures are ~170K (-100 C), although there is quite a range in this scene wth the darker patches warmed by the sun to as much as ~200K (-70 C), depending on exact direction of local slope, and the ice at ~147K (-125 C).
I'll post this bit then go off and look at MOLA for this scene...
Space/Science » in reply to an ice reflection?
See the channels?