The mitochondrial haplogroup K1, which defines Ötzi’s maternal line, tells a related but somewhat different story. Haplogroup K as a whole is associated with Neolithic expansion and is found across Europe and the Near East today. The specific subclade K1ö was a designation created for Ötzi’s specific mitochondrial lineage because it did not match any previously characterized subclade — a unique branch of the K1 tree that has not been found in modern populations sampled to date, though it may exist at frequencies below the detection threshold in populations not yet fully surveyed.
The absence of K1ö in modern populations is consistent with the genetic evidence that Ötzi belonged to a relatively isolated Alpine community whose specific genetic variants have been substantially diluted or replaced over five thousand years of subsequent migration and mixing.
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## The Glacier That Preserved Him: Glaciology and Mummification
Ötzi’s extraordinary preservation state required a very specific set of conditions that do not apply to most human remains in Alpine environments. Understanding those conditions illuminates both how he was preserved and why the discovery was possible at all in 1991.
A glacier is not a static block of ice. It moves, deforms under its own weight, and grinds and crushes whatever is embedded in it. Most organic material — wood, bone, flesh — that falls onto or into a glacier is eventually destroyed by the mechanical forces of glacial movement, even if the cold temperatures initially slow decomposition.
Ötzi was preserved because he was not, in the relevant sense, inside the glacier. The site at Hauslabjoch was a rocky depression — a low-lying gully between two ridges — below the main moving glacier. His body was deposited in this gully, which was then covered by snow and ice but was protected from the main glacier’s shearing forces by the rock walls of the depression.