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their regular thickness and repeated character suggest that episodic, or perhaps cyclic, processes brought sediment to the crater floor. If the crater contained water at the time the sediments were deposited, then they represent lakebed materials.
By all appearances, someone has been practicing opencast mining on Mars.
Don't take my word for it, take a stroll around earthen mining sites with Google Earth, and then go to MSSS, or the Themis and Mars Express websites, Explore Mars, see for yourself
This look at possible mining is far from over, I continue to search for corroboration;
In fact, we've hardly scratched the surface..