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 [=are from the distant past; are very out of date]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.
(..) Your Grace. What are we reading today? The Book of the Mother, Your Holiness. Chapter three, verse . Ah, "As water rounds the stones, smoothing..." "Smoothing what was jagged, so does a woman's love calm a man's brute nature. A wife salves her husband's wounds, a mother sings her son to sleep." (..)2016 TvShow: Game of Thrones Title: The Broken Man Season: 6 Episode 7