Polosmak and her team were guided by a border guard, Lt. Mikhail Chepanov, to a group of
kurgans located in a strip of territory disputed between Russia and China. A kurgan is a burial mound filled in with smaller sediment and covered with a pile of rocks; typically, the mound covered a tomb chamber, which contained a burial inside a log coffin, with accompanying grave goods. Such burial chambers were built from notched wood logs to form a small cabin, which may have resembled the semi-nomads’ winter shelters. The Ice Maiden's tomb chamber was constructed in this way, and the wood and other organic materials present have allowed her burial to be dated. A core sample from the logs of her chamber was analyzed by a
dendrochronologist, and samples of organic matter from the horses’ stomachs were examined as well, indicating that the Ice Maiden was buried in the spring, at some point during the 5th century BC. Before
Polosmak and her crew reached the Ice Maiden's chamber, they hit upon a second later burial in the same kurgan positioned on top of the Maiden's wooden tomb chamber. The contents included a stone and wood coffin containing a skeleton, along with three horses. Polosmak believes that this secondary burial was that of an outside group, perhaps of subordinate peoples, who considered it honorable to bury their dead in Pazyryk kurgans. A shaft dug into the kurgan indicated that this later grave had been robbed, another means by which water and snow entered and seeped into the Ice Maiden's hollow burial chamber. The water collected, froze, and formed an ice block within the chamber which never fully thawed because of the steppe climate, permafrost, and the rocks piled on top of the mound which deflected the sun's rays. The contents of the burial remained frozen for 2400 years, until the time of Polosmak's excavation. == Tomb chamber ==