This has been discussed in detail on ATS. Two schools of thought:
* Natural eroded rock.
* A piece of wood.
If the latter, then it is pretty interesting! But as to what it really is will only be known once we get our boots up there and analyse it!
Cheers!







But heck, I wonder how exactly they
develop these prints? I thought it must be in a completely sterile environment. But just look at the dust particles, thread, hair, developer blotches
and so on littering the images. Jeeez!! 







) 