Marvdasht Historical Sites Gradually Destructed
http://www.chn.ir/en/news/?id=5463§ion=2
From the above link
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Moreover, the joint activities of Iranian and American archaeologists were launched one month ago in Marvdasht, aiming at completing work done before the Islamic Revolution of Iran.
The team has so far discovered 22 fortresses and settlement areas dating to the Sassanid dynasty, early Islamic era, and third millennium BC.
As the American supervisor of the team,Tobin Hartnell, a PhD student of the University of Chicago, suggests, the settlement areas seem to have been villages, each two to six hectare vast. “The fortresses show that we have discovered an important ancient settlement there.