Numerous sites belonging to the Wusun period in Zhetysu and the Tian Shan have been excavated. Most of the cemeteries are burial grounds with the dead interred in pit-graves, referred to as the Chil-pek group, which probably belong the local Saka population. A second group of kurgans with burials in lined catacomb chamber graves, of the so-called Aygîrdzhal group, are found together with the Chil-pek tombs from the 2nd century BCE to the 5th century CE, and have been attributed to the Yuezhi. Graves of the Wusun period typically contain personal belongings, with the burials of the Aygîrdzhal group often containing weapons.