Maybe the Martians trucked in the black sand. Saving it in the cave. Waiting for there to be a beach. Only some spilled out.
There's fairly abundant black "sand" (may or may not resemble terrestrial sand, have to take a closer look -- maybe it's all blueberries) in Gusev, this image shows a broad swath of dark stuff from orbit:
and many, many dark trails that are assumed to be due to dust devils are seen on the Gusev surface.
But note, recorded dust devils appear to leave no tracks or barely perceptible ones in Gusev.
Apart from Martians trucking sand to the cave, we need an understanding of how and why the black "sands" are concentrated in this location as opposed to being spread in dunes throughout the basin...
Space/Science » in reply to It is a cave. It's just full of sand. So there.
Prolly.
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- Black "Sand" El Dorado