Why did the Ubaid period disappear without a trace?

There is something oddly striking about this one hit wonder place. The Ubaid period went from humble farming beginnings to a prospering urban city due to a pottery boom.

Then one day, its world ended. And just like that, it disappeared without a trace.

This video explores a hidden mystery that spiked a hip and roaring economy well known for it's innovative inventions during a new technological era.

Yet, there is one thing that sets this place apart from all the others, a unusual encounter with foreign visitors. And it's not what you think.

Link:
Tell Kosak Shamali 9000 - 6000 year old farming community by Hanslune posted on March 5th 2012
https://www.abovetopsecret.com/forum/thread816297/pg1