Remote observation done on Sol 620 by the Mars Perseverance Rover using it's telescopic SuperCam RMI camera. What do you make of some of those rounded rocks embedded in the wall?

NASA/JPL-Caltech/LANL/CNES/IRAP/Kevin M. Gill

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@kevinmgill The alt-text straight up says "river delta". Looks like concreted cobbles that have been eroded again.
@kevinmgill Looks like the sort of thing one could expect from a large debris flow. If I'm understanding the scale correctly, they are rather large rocks, so it must have been a pretty spectacular event.
@kevinmgill Wind erosion or, if the rocks are old enough that they once bordered a waterway, then erosion from that source.