Great image, I really like the stark contrast and the foggy layer to offset the starkness. I can guess what wetbanana did (perhaps he wants to keep for himself, as I can also understand). But here's my guess: take two crater shaders, and have them lean towards each other with the help of some redirect plus tilt and shear. Then add some displacement, etc. It takes some fiddling to get them to join. If you look closely you can see where they adjoin. I did this a week ago, but abandoned it for the snow thing.
---Dune
