applying glass shader to a displaced part of geometry

[Nala1977]

hey guys, i have a displacement on top of an existing terrain, which i colored white/yellowish so i can show it to you by using the displacement "apply color" tab.

Now lets say i want to apply to this displacement a glass shader, how would i connect that node? im trying without success.

here is the tree and the crop render

[WAS]

I honestly don't understand your node network but assuming the terrain is isolated like you show it, you should be able to add the glass shader as a child of the surface layer. 

A TGD would be easier to demonstrate for you