about 12,500 BCE, and organized trading of it was occurring during the 9th millennium BCE (Cauvin; Chataigner 1989). Sardinia was one of the four main sites for sourcing the material deposits of obsidian within the Mediterranean; trade using obsidian was replaced during the 3rd millennium BCE by trade of copper and silver. Record-keeping Objects used for record keeping, "bulla" and tokens, have been recovered from within Near East excavations, dated to a period beginning 8000 BCE and ending 1500 BCE, as records of the counting of agricultural produce. Commencing in the late fourth millennia mnemonic symbols were in use by members of temples and palaces to record stocks of produce. Types of records accounting for trade exchanges of payments were first being made about 3200 BCE. The Code of Hammurabi, written on a clay tablet around 1700 BCE, describes the regulation of banking activity within the civilization (Armstrong); although still rudimentary, banking was well enough developed to justify laws governing banking operations. Later during the Achaemenid Empire (after 646 BCE), further evidence is found of banking practices in the Mesopotamia region. Structural By the 5th millennium BCE, the settlements of Sumer, such as Eridu, were formed around a central temple. In the fifth millennium, people began to build and live in the civilization of cities, providing a structure for the construction of institutions and establishments. Tell Brak and Uruk were two early urban settlements. Earliest forms of banking Asia Mesopotamia and Persia Banking as an archaic activity (or quasi-banking) is thought to have begun as early as the latter part of the 4th millennium BCE, to the 3rd millennia BCE. Prior to the reign of Sargon I of Akkad (2335–2280 BCE) the occurrence of trade was limited to the internal boundaries of each city-state of Babylon and the temple located at the centre of economic activity therein; trade at the time for citizens external to the city was forbidden. In Babylonia of 2000 BCE, people depositing gold were required to pay amounts as much as one sixtieth of the total deposited. Both the palaces and temple are known to have provided lending and issuing from the wealth they held—the palaces to a lesser extent. Such loans typically involved issuing seed-grain, with re-payment from the harvest. These basic social agreements were documented in clay tablets, with an agreement on interest accrual. The habit of depositing and storing of wealth in temples