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Just from this surface image, you can figure stuff out. All those rocks (whatever they are made of - that is still a mystery), are all rounded, and the same size.

Rounding suggests erosion, those "rocks" banged together repeatedly. Likes rocks in a river or shore (hint-hint-hint).

And sorting by some type of process where bigger rocks dropped out somewhere else, and smaller rocks or pieces dropped somewhere else.

Either a flood deposit or a stream deposit.