Yukon Ice Patches

The latter are constantly moving; they gradually build up mass over time until they reach a certain size, when they slowly flow downhill.

[1]: 2  In September 1997, Gerald W. Kuzyk discovered the first of the Yukon ice patches artifacts, an atlatl dart fragment, on mountain Thandlät at an elevation of 1,850 m (6,070 ft).

[7] "At [the Kusawa Lake] location, a small fragment of wooden dart shaft was recovered and radiocarbon dated to 4360 ± 50 14C yr BP (TO 6870).

Also reported was a caribou dung pellet dating to 2450 ± 14C yr BP (TO 6871) collected from a nearby ice core 1.6 m (5.2 ft) below the surface (Kuzyk et al., 1999:214).

Radiocarbon chronologies indicate that this period of stability was followed by an abrupt technological replacement of the throwing dart by the bow and arrow after 1200 BP."