Intensive but localized cultivation of cereal crops on alluvial wetlands is thought to have provided the ecological basis for the primary Neolithic settlement that spread across southwest Asia and southeast Europe. New excavations at Catalhoyuk provide an opportunity to test this horticultural model via multiple data sources. Geoarchaeological studies show that the main Neolithic occupation coincided with a period of active river alluviation. Most of the area surrounding Catalhoyuk was therefore under floodwaters each spring that would have seriously damaged any autumn-sown cereal crops. Independent evidence that the cereal crops consumed at Catalhoyuk were grown under rain-fed conditions derives from the paucity of silicified multicellular wheat phytoliths at the site. Together, these and other data suggest that the bulk of the cereal agriculture was not carried out in the immediate vicinity of Catalhoyuk but was at least 13 km and 3 h away in dryland soils. In turn, this implies that there may have been seasonal fission and fusion of Catalhoyuk's population, with systematic exploitation of, and impact on, a range of different ecological zones. This phase of nucleated settlement ended when river flooding ceased, coincident with a multi-decadal drought from 6300 to 6140 BC.
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