Sharing my procedural canyon shader

Hey! I made this shader and I would like to share it with you guys: https://gumroad.com/markfaasen
Also I made a tutorial https://youtu.be/AMTglCOvKI8

Great work,with not that many nodes to that result is allways preferred vs endless nodels.
I would like to simulate erosion,like river building from hills down ect.I am not sure if this is would be easy without a kind of fluid script.

beatiful work!