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 [=are from the distant past; are very out of date]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.
(..) - that I've been robbing kids of nickels and dimes. A man I've admired and worshipped all my life. There are a lot of fancy words here. Some of them are carved in stone, some of them men like Taylor put up there, - - so suckers like me could read them. Then you find out what those men actually do. (..)1939 Mr. Smith Goes to Washington