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 [=are from the distant past; are very out of date]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.
(..) - Amassed on the cliffs. Their numbers are swollen. They say that the king's standard flies again. Then let them come, let them break their skulls on these stone walls. And bring me my prize. My Lord, we only have a few hours before the tide comes on. Not long enough to breach the castle walls. (..)2012 Snow White and the Huntsman