Odd looking stuff on Larry's Lookout - Spirit images
What are we looking at here? Spirit Navcam image from sol 409, I think on "Larry's Lookout". The first thing that comes to mind is snow, but of course....
Dust? A mineral deposit? A giant Martian seagull dropping?
It looks like something that's been deposited on top of the rocks and then partially eroded away.
Nav Cam
A closer view from the Pan Cam here and here
They seem quite interested in the stuff, whatever it is - lots of different shots on sol 409-411.