Okay,
my first thoughts about that strata-thingy.
In my point of view, strata is not only some sort of distorted layered displacements.
Following points should be taken into account:
1. Strata are layers of mud/stone of different heights, colours and/or hardness.
2. Unless being in an area without any earthquakes, we find tilted and/or curved strata. Enclosed stones distort the strata, too.
3. Strata can only been seen, where the topmost layer of soil is gone, so first of all we'll need an area of negative displacement.
The easiest way to achieve this would be, to use 2 or more merged Strata and Outcrops shaders (each with different tilts).
It might be funny, to use your height-driven perlin to blend those shaders.
Another approach I would go for, are perlins stretched along x- and z-axis. To give them some more interesting directions you could add some perlin driven sines to the y-position of the 'Get Position (in texture)'-Node.
I'll go for the last one ...
Volker