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<p>from about 5300 to 4300 BC. It is preceded by the <a href="page.php?w=Halaf_period">Halaf period</a> and the <a href="page.php?w=Halaf-Ubaid_Transitional_period">Halaf-Ubaid Transitional period</a>, and succeeded by the Late <a href="page.php?w=Chalcolithic_period">Chalcolithic period</a>.</p>

<p><big> History of research </big></p>
<p>The excavators of <a href="page.php?w=Eridu">Eridu</a> and <a href="page.php?w=Tell_al-%27Ubaid">Tell al-'Ubaid</a> found Ubaid pottery for the first time in the 1910-1920s. In 1930, the attendees at a conference in <a href="page.php?w=Baghdad">Baghdad</a></p><p>
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