Glad to see Quark on 1.14!
I've disabled the whole World module in my config, as well as the individual stone veins (Seems I forgot to do that, but disabling the World module should disable this feature nonetheless): https://pastebin.com/0A4wmGvs

but I'm still seeing marble, slate, vanilla stones, etc in large veins, viewed with world stripper:

World module is definitely disabled though, all of its recipes are disabled, weather sensor is using obsidian, crabs don't seem to spawn, and I can't find any spelotheums.

I'm having this same issue, not matter what I try I cannot seem to disable the large stone clusters.

Minecraft Version: 1.14.4

forge-28.1.87

Quark-r2.0-198.jar

Did you disable it before generating the world? Because due to how configs work in 1.14, nothing gets disabled, but it shouldn't generate in that case.

I did. This is a new world after editing quark-common.toml