Okay ET, enough of this pissing contest. I only mentioned my credentials because you suggested I take a trig class.

About the picture. If the Gully was deep enough, there would be a thin shadow at that sun angle (Calculating the time and latitude) but not enough to cover that black area. I don’t have the best eyesight- I am blind in one eye and not that great in the other, so maybe I am missing something. If you look at the other gullies and few craters in the area you don’t see any shadows because of the high sun angle.

I will await Nick’s or Alex’s judgment (If they choose to) and accept what they say because I trust their judgment on this stuff. If they say you are right, I’ll admit defeat.

But I still say those gullies are full of some dark material, and, since I do not see any dark dust elsewhere in the area, it might be related to water flows.

Which is what I said at the start of this argument.