Про способ захоронения толком ничего не написали. Общие фразы.Радиоуглеродный анализ останков даёт дату 8-10 век н.э.
The Gangga site is located in Chen Barag Banner (119.45°E, 49.33°N) of the inner Mongolia region of Northeast China (Fig. 1) [15]. The radiocarbon analysis of the remains from the Gangga site dated these samples to the eighth to tenth centuries AD. Several items were discovered in Gangga burial sites,including as pottery, wooden saddles, birth bark quivers,iron arrowheads, bronze belt ornaments and agate beads (Fig. 1c). These findings, in conjunction with evidence of certain mortuary practices, indicated that the Shiwei populationresided in the Gangga region [15].