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 [=are from the distant past; are very out of date]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.
(..) Vanessa Denise Lowrie. Christopher Jhonson McAndles. Regina Victoria McNabb. I can see them to the doors of their University. I see my father greeting under the stone arch, the red potteries as blood are behind their head. I do my mother with some books in their hands, in the patio of recesses, (..)2007 Into the Wild