The documentation is being updated. There may be incomplete sections.
Terrain Folding without the Fold Node
Create a highly warped Perlin.
Displace with a few iterations for nice long stretches (High Quality off), and then clamp it to get the height down.
Erode with default settings.
The main image is with a bit of snow added, and Texture + Satmaps (both using Navajo Sandstone presets).