Where to get sarsen stone?

[Rhubyx]

I've looked high and low and everywhere in-between, on youtube, google, and nothing is telling me where to get this godforsaken rock. I need it for the quern, and I have no clue where it's found. Where/how do I get it?

[Intresting09]

I ended up downloading an xray mod to find the stone types. I'm playing sevtech and they're very rare and seem to have some biome requirements. I unfortunately don't know the requirements for most
however, I've seen a pattern of sarsen stone generating beneath wooded areas with high elevation (in sevtech at least)