What Are Some Examples of Money in the Ancient World?

A new paper came out in antiquity magazine about an excavation at an ancient chinese city where they discovered a cash of this spade money from roughly 600 b c e. Each spade coin is cast in the shape of a 14 centimeter long spade with a really stylized shovel blade. And it's attached to this really carefully crafted hollow handle. These were anccient coins that existed basically during a transitional period between barter and money, when coins were a pretty new concept.