First I have ever heard it called that, Bert!

"Contrary to the assumption that ancient cities always grew outwards from a central point, the urban site of Tell Brak in north-eastern Syria appears to have emerged as several nearby settlements melded together, according to researchers' analysis of archaeological evidence.

Experts say that the findings lend support to the theory that early Mesopotamian cities developed as a result of grassroots organisation, rather than a mandate from a central authority.

The new study provides important details about Tell Brak, helping to make it "the first early city of which we have a picture about how it formed," comments Geoff Emberling at the Oriental Institute Museum in Chicago, Illinois, US, who was not involved in this study but has done archaeological work at Tell Brak.

Located in north-eastern Syria, Tell Brak lies between the Tigris and Euphrates rivers and can therefore be considered as an ancient Mesopotamian site. It is thought to have been settled as early as 6000 BCE, according to Harvard University researcher Jason Ur."

(New Scientist web site)