Rockefeller made his money in oil, which he discovered at the bottom of wells. Oil was considered crude in those days, but so was Rockefeller. Now both are considered quite refined.
Source: It All Started with Columbus, 1953.
-- Richard Armour, (Jul 15 1906-1989), US poet; He was a whimsical poet known for poking fun at everything; had a syndicated column Armour's Armory.