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 [=are from the distant past; are very out of date]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.
(..) - they have a varied menu. Okay,whatever. It sounds like fun. Great. Did we say a time? - And that's still good for you? - It's fine. - 'Cause it's not carved in stone. - No's great. I'll get my chisel. Why? To... carve the... I'll see you at . How do I look? (..)2007 TvShow: The Big Bang Theory Title: The Fuzzy Boots Corollary Season: 1 Episode 3