I just want to mention that the solution could locate in code but not in textures. The "fade" range should be much shorter than we have now.
I agree. In fact, there are two sides of the problem. One is the fluffiness of
cliff texture spreading that makes some passable areas look unpassable. This problem is code-related and not rockies-specific, but
cliff decals could solve it as well. The other side of the problem is that on rockies tileset gravel and
cliff seem to be a bit too similar. I don't think the whole texture pack needs rework (it's very beautiful!), but probably just a slight touch is needed to make those two textures more distinguishable.
One sec, i'll give the new
cliff decals a try.