hello again

now i am writing tutorials and one of the tutorials i am going to write is on strata creation.
now i was wondering if my method of strata creation is the right way.
this is my method of creating strata.
first i apply a surface layer then i limit minimum slope angle so that the surface shader only sits on the high angle face of the terrain.
i then apply a default shader to the surface layer.
in the default shader i open a strata picture.
then under the colour function button i assign an image map shader with the same strata picture.
also if i want to add a more natural effect to the surface layer i open an organic picture under the default shader preferably some sort of rock texture, then under the colour function button i assign a imagemap shader with a strata image inside it.
now is this the right way

if not can someone please tell me how to do it the right way.
thanx jack