I came up with a rather intreasting series of results that could pass as a lateral fault slipping the back end of the mountain range, some strata folds which conveniently follows the fault, then there are tiny rock out croppings in the desert terrain and lastly aluvial fan formations draining water from the warmer end of the mountain.
http://www.ashundar.com/datas/users/1941-desert%20side%20mnt%20-%20fault%20-%20aluvial%20fans.zip
http://www.ashundar.com/datas/users/1941-mixed%20terrains.jpg