I created a new terrain skirting tool that generates procedural geometry by utilizing some of the things I learned from Pragmatic Vex: https://www.pragmatic-vfx.com/
The tool traces the contour lines of the terrain to determine where to generate the geometry, and provides lots of additional options for shaping the geo as well. It can run over the entire terrain or within terrain masks.
Trace the contour lines of the terrain for mesh generation.