"It is not clear yet what kind of building the wall belongs to," Valiollah Dehqan-Sanich, the director of the archaeological team working at the site, was quoted by MNA as telling the Persian service of CHN on Saturday.
The team hopes to find out the use of the structure during the season of excavation currently underway at the site, he added.
This season of excavation, aimed at studying the various historical periods on the mound began August 8, 2008.
Due to the nearby historical caravanserai and the shrine of Imamzadeh Yengeh-Emam, archaeologists said that the wall may be a trace of a historical town in Savoj-Bolagh.
The necessary funds to safeguard the site against smugglers of artifacts has been provided, Dehqan-Sanich said.
The Ilkhanids (1256-1353), a Mongol dynasty that ruled in Iran, was founded by Hulegu, a grandson of Genghis Khan.