![]() ![]() Horses, camels, giant sloths, saber-toothed cats, dire wolves, short-faced bears and the wooly mammoth all went extinct. When it was over, most of the large mammals of the Americas were gone. Then suddenly, a climactic shift thrust temperatures back into an ice age in the Northern Hemisphere. The planet was leaving a prolonged ice age, continental glaciers were receding, and humans and megafauna were expanding into new territories. ![]() The Younger Dryas is a climate-driven extinction event. Also interesting, all identified fish before 11,800 years ago are freshwater fish, which might hint at a connection to environmental climate change associated with the Younger Dryas event. The authors note an absence of grayling, char and longnose suckers, despite those fish currently inhabiting the river. ![]() Identified fish included salmon (34%), burbot (58%), whitefish (7%), and northern pike (<1%).Īll of these fish are still caught today in the Tanana and northern North America. Of these, 627 (56%) could be identified to a taxonomic level. Eight sites had materials available for study, with seven dating from the Younger Dryas ~11,650 to 12,900 years old.Ī total of 1,110 fish specimens were identified, all of them Actinopterygii ( ray-finned fishes). Ten sites were identified, all from the middle Tanana basin, where the Tanana River runs through before connecting to the larger Yukon River. The team sifted through all known sites older than 7,000 years for reports of fish. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |