Historical whaling tools retrieved and dated

As I blogged already last autumn, some whaling tools recently retrieved from bowhead whales witness both historical hunting techniques and the amazing life spans of these whales. Now an arcticle of the scientific journal "Polar Biology" has appeared with detailed information on the dating of these harpoon and lance fragments. See the article online here:

"The age of bowhead whales captured by Native Alaskan hunters in the Bering, Chukchi and Beaufort Seas has been estimated via chemical analyses of the eye lenses, and other techniques. The racemization-age estimates indicate that bowhead whales (Balaena mysticetus) have a lifespan of more than a century. Stone and ivory weapon fragments recovered from bowhead whales hunted in Wainwright and Barrow (Alaska) in 1981, 1992, 1993 and 1997, provided rough but independent assessments of the whales’ longevity; however, their date of manufacture was unknown. Adding further confirmation of these age estimates, this note describes bomb lance fragments recovered recently (2007) and about 30 years ago (1980) from bowhead whales harvested by Eskimo hunters that were “dateable” and likely manufactured between 1879 and 1885. (Source: Polar Biology's website).