During a report on the construction of new housing on Harlem's Coogan's Bluff (site of the storied Polo Grounds), the reporter, referring to difficulties the developer was encountering, said that it wasn't easy digging "the decades old bedrock." Yes, about five hundred million decades.
This reminded me of the time when Clinton Street, in Brooklyn, was being dug up to put in new water lines and the road crew extracted from the ground a gigantic boulder that was in the way. They left it on our corner. Marveling at the size of it and intrigued that it had been hidden only a few feet below ground, one of my neighbors said that it was amazing that it had been there since "before the Revolutionary War." Yes, way before.