As she scraped cold dirt from the remains of an extinct bison, Pam Groves wrinkled her nose at a rotten-egg smell wafting from gristle that still clung to the animal’s bones. She lifted her head to scan the horizon, wary of bears that might be attracted to the flesh of a creature that gasped its last breath 40,000 years ago.
In the type of discovery they have dreamed about for years, Groves and Dan Mann, both researchers at the University of Alaska Fairbanks, in summer 2012 found in the thawing bank of a northern river almost the entire skeleton of a steppe bison that died during the last ice age.
In adventurous work sponsored by the Bureau of Land Management, Mann and Groves have been boating down lonely northern rivers for 15 years looking for scattered bones of ice age mammals, always hoping to find a complete skeleton or mummy of a mammoth, horse, or American lion. In mid-June, on a familiar stretch of river that flows northward on Alaska’s North Slope, they rounded a river bend and saw the skull of a large bison trapped against a willow shrub.
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