 During this period there is no evidence for rice production, however it is believed that these people might have been rice producers, even though no definitive evidence has been discovered yet.Phase II is defined by a larger population and definitive evidence for the mass production of rice.The borders of the site expanded during this period (possibly covering 100,000 square meters or more), as well as the presence of permanent mud brick architecture, including a city wall, probably built during the latter half of the first millennium AD using the cylindrical brick technology, "which was 3.7 meters wide at its base and ran almost two kilometers around the town".