Which prehistoric period of Mesopotamia were the majority of the remains from found in Tell al-Ubaid?
Tell al-`Ubaid:  The majority of the remains are from the Ubaid period, for which Tell al-'Ubaid is the type site, with an Early Dynastic temple at the highest point. Ubaid period: The Ubaid period (c. 6500 to 3800 BC) is a prehistoric period of Mesopotamia.
i don't know