Three day delay until a suitable subject title occurred to me (lightbulb emoji should be here).
Nice erosion. I think if you add a strata shader masked by some slightly vertically stretched billowy noise (size 50/100/10), you might get some interesting... well, eroded strata.
I added Ulco's suggestion of a Strata shader masked with billowy noise (vertical stretch of 5) and am quite pleased with the result. I also added a Twist and Shear displacement with a 0.25 lean. I hope the result is somewhere near what Ulco had visualised.
Nice!
Yeah, that's cool.