 The tooth, directly date to around 9000 BP, belonged to a young child.The young child from Trail Creek Cave 2 was found to cluster genetically with "USR1" from the Upward Sun River site in a hypothesized ancient DNA population grouping referred to as Ancient Beringian.As with "USR2" from the Upward Sun River site, the child from Trail Creek Cave 2 was also found to carry a basal lineage of Haplogroup B2; this specific mtDNA lineage is different from the derived B2 lineage generally found the Americas.