I promised an image, here it is.

Used the following pattern code:

texture {
   slope {
     <0.0, -0.3, 0.0> , 0.0 , 0.5
     altitude <0, 0.7, 0.0> , LowerBound-5 , UpperBound
   }
   texture_map {
     [0.60 Grass]
     [0.65 Soil or weathering if you want]
     [0.80 Rock]
   }
}

Note that - as suggested by Le_Forgeron - I lowered Lo_alt a bit more 
than the lower boundary of the bounding_box of the isosurface. Playing 
with that setting gives indeed more interesting possibilities.

Thomas

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