Nail in Stone

A nail partially embedded in a block of stone taken from Kingoodie quarry in Scotland was described at a meeting of the British Association for the Advancement of Science in 1845, Sir David Brewster, who gave the report, said that about an inch of the nail was embedded, the rest lying along the stone and projecting into a layer of gravel, where it had rusted. The depth from which the 9" thick block of stone bearing the nail had been removed is not on record, but the quarry was said to have been worked for about twenty years prior to the discovery.

(Charles Fort, The Complete Books of Charles Fort, pg. 133)