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 [=are from the distant past; are very out of date]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.
(..) Whether it be turned on a spit,or to sit on us one by one,squash us into jelly. They spent so much time arguing the whithertos and the whyfors... ...that the sun's first light crept over the top of the trees... ...and turned them all to stone! Quickly. Up they go! No,the big one. (..)2001 The Lord of the Rings: The Fellowship of the Ring