Ubaid period in Mesopotamia (ca. 6500 to 3800 BC)

The prehistoric Ubaid period of Mesopotamia, as defined by Wikipedia following Carter, Robert A. and Philip, Graham Beyond the Ubaid: Transformation and Integration in the Late Prehistoric Societies of the Middle East (Studies in Ancient Oriental Civilization, Number 63) The Oriental Institute of the University of Chicago (2010) ISBN 978-1-885923-66-0 p.2, at http://oi.uchicago.edu/research/pubs/catalog/saoc/saoc63.html [[-6500, -3800]]