Landscapes like Terragen

Everybody knows TERRAGEN. What i like in this app is that it produces very, very detailed terrains. Terragen terrains are sort of crispy, chalky and dusty.
I tried to have the same effect in blender but i never could.
Does anybody knows how Terragen works to produce such effect ?
Is it possible to obtain the same effect in Blender ?
Please let me know.

Winx