Quote - I am most curious about these "strata filters"

are they in the function editor ?

could we ( ME :D ) ask for a step by step ?

It's in the function editor under Filters... Recursive...  There's a "Strata" node and a "Confined Strata" node, the latter adds upper and lower limits on the effect.

On the two images linked, I added it between the terrain fractal and the altitude output.  'Layers' features a very high "Rock Layer Hardness" while 'Peaks' usues a very low "Rock Layer Hardness" value.  Otherwise, mostly playing with the dials in those...

http://www.renderosity.com/mod/gallery/index.php?image_id=1962255&user_id=427128&np&np

http://www.renderosity.com/mod/gallery/index.php?image_id=1964843