(http://i.imgur.com/8msBRMo.png)
(http://i.imgur.com/r0PVPMc.png)
I really like the Strata and Outcrops shader but it lacks any DRE or Differential Resistant Erosion, so I came up with this function to be applied to it, or just a stoneface.
It's actually a pretty simple setup. Voronoi noise stretched out to give intersection channeling (resistant) and Differential (face angle erosion) looks.