(p. 71) At Mezherich, in what is now Ukraine, 18,000 years ago, jewellery made of shells from the Black Sea and amber from the Baltic implied trade over hundreds of miles.
This is in striking contrast to the Neanderthals, whose stone tools were virtually always made from raw material available within an hour’s walk of where the tool was used.
Ridley, Matt. The Rational Optimist: How Prosperity Evolves. New York: Harper, 2010.