Scientists discovered a hidden stand of whitebark pines on Wyoming's Beartooth Plateau, 180 meters above the tree line at 3,100 meters elevation.

there's a mature forest growing here 5,000 years ago, where there are no trees today," The site is nearly 700 feet above the current tree line. The find was detailed in a paper published Dec. 30 ...

An ancient fossilized forest in Montana is reemerging 600 feet higher than the present-day tree line after spending the last 5,500 years encased in alpine tundra. But as temperatures continue to ...

Trees dating back almost 6000 years have come to scientists' attention due to ice melting in the Rocky mountains, offering a "time capsule" into the past ...