"Norway's Jotunheimen Ice: 48 Prehistoric Arrows Emerge From Melting Mountains"

For twenty years, the ice in Norway's Jotunheimen mountains has been giving up its dead slowly, a Viking-age shoe here, a mitten there, the everyday kit of people who crossed high passes when the world was colder and emptier. This season it gave up something older and stranger: 48 prehistoric arrows, recovered in three intense weeks from the Kvitingskjølen area, including one whose slate point and wooden shaft are estimated to be 5,000 to 6,000 years old. The oldest arrow is not the whole story. The shift in what the ice is releasing is.

The expedition, run by the Secrets of the Ice programme, worked the Langfonne, Storfonne and Handklefonne ice patches, places where whole stretches of ice that were covered only recently are now completely exposed. The haul spans thousands of years of hunting technology in a single season. There is a roughly 3,600-year-old complete arrow with a wooden shaft and a head made from freshwater mussel shell. There are arrowheads of bone, and there are iron points from roughly 1,000 to 1,500 years ago. Put side by side, slate, shell, bone and iron tell a story no single weapon could: how the materials people trusted to bring down a reindeer changed, and how long the same high passes stayed in use.

That long use is what makes the programme's archive so unusual. Since work began in 2006, Secrets of the Ice, a collaboration between Innlandet County Council and the Museum of Cultural History in Oslo, has recorded 73 archaeological sites and recovered more than 5,000 artefacts from Norway's mountain ice: hunting gear, clothing, shoes, pack animals and the objects of ordinary life. Among them are a 3,400-year-old leather shoe and what is described as the world's oldest intact pair of wooden skis, plus a complete tunic from around 300 CE and a mitten from around 1000 CE. Ice, as the researchers like to point out, pauses decay. Kept cold, dark and without oxygen, wood, hide, sinew and textiles survive for millennia instead of rotting away in months.

But the programme's own history also explains why this season feels like a turning point. When the work began, most objects coming out of the ice were less than 2,000 years old, and Viking-age finds were common; anything older than 2,000 years was rare. Now, project leader Espen Finstad reports, the picture has changed dramatically: increasingly, the artefacts melting out are more than 2,000 years old, many date to the Stone Age and Bronze Age, and the oldest are more than 6,000 years old. The reason is not that archaeologists suddenly got better at looking, though they have. It is that the older, deeper layers of ice are themselves disappearing, and as they go, they release what they held longest.

That is the brutal part of the find, to borrow the word Smithsonian used for it. Every arrow recovered is also an arrow that was safe until now. Once organic material is exposed to air, warmth and microbes, its clock restarts, and it begins to decay. The race is not really between archaeologists and the ice; it is between archaeologists and the weather after the ice has already lost. A season like this one, with 48 arrows from three patches, is a success measured against a loss that is still happening.

I find myself thinking less about the weapons than about the hands that lost them. A hunter who dropped an arrow in a snowfield 5,000 years ago did not lose a museum piece; he lost a tool he probably needed that day, and then he walked on, because that is what people do when something breaks or slips away on a mountain. The ice kept the loss. Now the ice is returning it, not as a message, but as evidence: that people were here, that they hunted here for thousands of years, and that the ground they walked on is changing faster than any of them could have imagined. What we recover in the next few seasons will tell us how much of that evidence survives the thaw, and how much of it we were simply too slow to catch.