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 [=are from the distant past; are very out of date]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.
(..) And beyond our skills, ser. Were you a commoner, I'd have you shipped to Valyria at once to live out your life with the stone men. As an anointed knight, I'll allow you one more day. How you choose to spend that time is up to you. Come, Samwell. (..)2017 TvShow: Game of Thrones Title: Stormborn Season: 7 Episode 2