The Anzick individual from Montana — a young child buried with Clovis technology approximately 12,600 years ago — represents a different kind of ancient American.

Anzick-1 is substantially older than the Hourglass Cave man and is associated with a specific archaeological cultural horizon: the Clovis tradition, which represents the earliest well-documented, widespread technological tradition in the Americas.

The Anzick genome, published in 2014, showed affiliation with haplogroup D — one of the five founding Native American haplogroups — and demonstrated that the Clovis people were genetically connected to modern Native American populations.

The Hourglass Cave man, several thousand years younger and carrying haplogroup B, adds a different founding haplogroup to the geographic area of the Rocky Mountain West, demonstrating the presence of this second founding lineage in the interior of the continent at the early Holocene.