His political ideas are from 'the Stone Age'. [=are from the distant past; are very out of date]
Their lawyer said that he would 'leave no stone unturned' in trying to find more evidence.
The researchers 'left no stone unturned' in their search for the original documents.
(..) Thor. I've had a vision. A whirlpool that sucks in all hope of life and at it's center is that. What, the gem? It's the Mind Stone. It's one of the six Infinity Stones, the greatest power in the universe, unparalleled in its destructive capabilities. - Then why would you bring it to... (..)2015 Avengers: Age of Ultron
(..) Ask Noah. You're a madman. There were more than a dozen extinction level events before even the dinosaurs got theirs. When the Earth starts to settle, God throws a stone at it, and believe me, he's winding up. We have to evolve. There's no room for the weak. And who decides who's weak? (..)2015 Avengers: Age of Ultron