Roughly 6,000 years ago, Mesopotamian cities in what's now southern Iraq began as central clusters of buildings and then spread as orchestrated by authorities. About the same time, a different pattern of city development occurred in northern Mesopotamia, a new investigation finds. Instead of expanding outward from a densely populated core, an ancient metropolis in what's now northeastern Syria emerged over an 800-year period as a number of settlements grew together and expanded inward toward what then became the city's core, say Jason A. Ur of Harvard University and his colleagues.
Note: To comment, Science News subscribing members must now establish a separate login relationship with Disqus. Click the Disqus icon below, enter your e-mail and click “forgot password” to reset your password. You may also log into Disqus using Facebook, Twitter or Google.