Yeah, i need to register today and check that out. Still have some work to do on “Detachment Faults” with Turtleback formations speaking of which.
Badwater Turtleback Fault in Death Valley.
Look at “Photo ID: hf8mz4” 7th photo down from the top.
http://www.planetside.co.uk/gallery/v/tg2gallery/olivier_cousinou_eroded_strata.jpg.html
I always imagined Terragen with a Procedural Displacement Brush as well, i had brought up these ideas to Planetside but that was nearly 2 years ago i think.