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 [=are from the distant past; are very out of date]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.
(..) Ravenscroft is a time ? institution devoted to mental improvement. You're experimenting on people in there. Progress has its stepping stones. Now, in light of your deceptive criminal actions, you have been... how do I put this gently... fired. You're not going to bury me too. (..)2014 The Amazing Spider-Man 2