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 [=are from the distant past; are very out of date]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.
(..) No. Neither i I. I was a cynic just like you. Then I saw a girl step into a great fire with three stone eggs. When the fire burne out, I thought I' fin her blackene bones. Instea, I saw her, aenerys, alive an unhurt, holing her baby ragons. (..)2015 TvShow: Game of Thrones Title: Unbowed, Unbent, Unbroken Season: 5 Episode 6