The Proto-Elamite period is the time from ca. 3400 BC to 2500 BC. In archaeological terms this corresponds to the late Banesh period, and it is recognized as the oldest civilization in Iran.
The Proto-Elamite script is an Early Bronze Age writing system briefly in use before the introduction of Elamite cuneiform.
During the period 8000–3700 BC, the Fertile Crescent witnessed the spread of small settlements supported by agricultural surplus. Geometric tokens emerged to be used to manage stewardship of this surplus. The earliest tokens now known are those from two sites in the Zagros region of Iran: Tepe Asiab and Ganj-i-Dareh Tepe.
The Mesopotamian civilization emerged during the period 3700–2900 BC amid the development of technological innovations such as the plough, sailing boats and copper metal working. Clay tablets with pictographic characters appeared in this period to record commercial transactions performed by the temples.
The most important Proto-Elamite sites are Susa and Anshan. Another important site is Tepe Sialk, where the only remaining Proto-Elamite ziggurat is still seen. Texts in the undeciphered Proto-Elamite script found in Susa are dated to this period. It is thought that the Proto-Elamites were in fact Elamites (Elamite speakers), because of the many cultural similarities (for example, the building of ziggurats), and because no large-scale migration to this area seems to have occurred between the Proto-Elamite period and the later Elamites. But because their script is yet to be deciphered, this theory remains uncertain.
Some anthropologists, such as John Alden, maintain that Proto-Elamite influence grew rapidly at the end of the 4th millennium BC and declined equally rapidly with the establishment of maritime trade in the Persian Gulf several centuries later.