Frozen graves of Yakutia, a chronological sequence

Distribution, cultural and chronological ENHANCED COLLAGEN RELAX attribution of frozen graves of Yakutia between the beginning of 17th and end of 19th century.The funerary rites and the artefacts allow to differentiate four chrono-cultural periods (before 1700 AD, from 1700 to 1750 AD, from 1750 to 1800 AD and Cherry Stoner after 1800 AD) which could be associated with historical events: opening of the trading post of Nertchinsk, expansion of the Kangalasky clan, economic collapse, generalization of Christianization.