The oldest evidence of hominid habitation in Jordan dates back at least 200,000 years. Jordan is rich in Paleolithic (up to 20,000 years ago) remains due to its location within the Levant where expansions of hominids out of Africa converged. Past lakeshore environments attracted different hominids, and several remains of tools have been found from this period. The world's oldest evidence of bread-making was found in a 14,500 years old Natufian site in Jordan's northeastern desert. The transition from hunter-gatherer to establishing populous agricultural villages occurred during the Neolithic period (10,000–4,500 BC). 'Ain Ghazal, one such village located in today's eastern Amman, is one of the largest known prehistoric settlements in the Near East. Dozens of plaster statues of the human form dating to 7250 BC or earlier were uncovered there and they are among the oldest ever found. Other than the usual Chalcolithic (4500–3600 BC) villages such as Tulaylet Ghassul in the Jordan Valley, a series of circular stone enclosures in the eastern basalt desert−whose purpose remains uncertain–have baffled archaeologists.