"In spite of the importance of this region, genetic studies on the Sumerians are limited and generally restricted to analysis of classical markers due to Iraq's modern political instability. It has been found that Y-DNA Haplogroup J2 originated in Northern Mesopotamia.[18][19] The Sumerians were a non-Semitic people, and spoke a "language isolate"; a number of linguists believed they could detect a substrate language beneath Sumerian. However, the archaeological record shows clear uninterrupted cultural continuity from the time of the Early Ubaid period (5300 – 4700 BC C-14) settlements in southern Mesopotamia. The Sumerian people who settled here farmed the lands in this region that were made fertile by silt deposited by the Tigrisand the Euphrates rivers."
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