http://archaeology.about.com/od/sterms/g/sumer.htm

BC starts in late 4th millennium period, Sumerians in agricultural urban district housing, for example Uruk, Ur, Kish, Lagash and Eridu. They have developed the cuneiform character, and has invented the tool for example plow and the wheel.

http://ancienthistory.about.com/library/weekly/aa030700a.htm

In about 7200 BC in Annatuoliya, the south central Turkey developed. Neolithic Age person in rectangular adobe building housing. Was considered that the earliest civilization started some further south, in Sumer.

http://lexicorient.com/e.o/sumer.htm

Southeast Meisuobudamiya first civilization country and place of birth in world history. The Sumer historical counting continues from approximately until 2000 BCE to 3500 BCE, according to the Sumeier person, these cultures is mainly Assyrian and the babylonian.