Using Mat Lab C and D columns for complex material and altitude control.

If you start out with a lousy looking terrain the best mat in the world won't help much. Get into the Terrain Editor and try the different types with Erode, Gaussiain edges, Basic and Slope noise.
The terrain shown is 1024 resolution made using Ridged Multi-Fractal, Eroded (not Erode) function and basic noise.