An ancient fossilized forest in Montana is reemerging 600 feet higher than the present-day tree line after spending the last ...

The fossilized remains of Whitebark pine trees found beneath a melting ice patch in the Yellowstone region were once part of ...

The cooler temperatures shifted the tree line downslope and transformed the high mountain landscape from forest to the alpine tundra that exists today. One of the paper's authors, David McWethy, ...

Ancient forest preserved under ice on the Beartooth Plateau provides a rare look into how warming climates could reshape alpine ecosystems.