Alaska's Koyukuk River was the site of an interesting discovery. During a float down the river, a group of University of Virginia professors spotted a woolly mammoth tusk along the riverbank.
Adrienne Ghaly, a postdoc in Environmental Humanities, was able to document the moment in a photograph.
"We're a group from UVA called Sanctuary Lab working on climate impacts on places of cultural and ecological significance," said Ghaly. "We were taken on a float down the middle fork of the Koyukuk River near Coldfoot, Alaska. The river was high and flowing fast, but my colleague Karen McGlathery was able to spot the tusk."