Several village sites contain the remains of unusual structures called "council circles," located at the center of settlements. Archaeological excavations suggest they consist of a central patio surrounded by four semi-subterranean structures. The function of the council circles is unclear. Archaeologist Waldo Wedel suggested in 1967 that they may be ceremonial structures, possibly associated with solstice observations. Recent analysis suggests that many non-local artifacts occur exclusively or primarily within council circles, implying the structures were occupied by political and/or ritual leaders of the Great Bend aspect peoples. Other archaeologists leave open the possibility that the council circle earthworks served a defensive role.