50 million years ago, a subtropical forest thrived in what is now the Gallatin Range of Montana. Towering trees, ferns, and prehistoric creatures lived in a warm, humid climate—until catastrophe struck. A massive volcanic eruption from the Absaroka Range unleashed lahars—deadly mudflows of ash, rock, and debris that surged down the mountainsides like wet concrete. These torrents entombed everything in their path, including entire forests. Some trees were petrified, their organic matter replaced by minerals over time. Others decomposed entirely, leaving behind tree molds—hollow casts of their former selves. Fast forward to today, and these ancient tree molds serve a new purpose. Over millions of years, erosion has exposed them, forming perfect natural caves. These shelters have become winter dens for wildlife, from bobcats and bears to, as seen in this video, a mountain lion. I love the thought that a lush, tropical forest—engulfed by volcanic fury—created a warm refuge for a mother mountain lion in the dead of winter, 50 million years later. The way landscapes transform over deep time, shaping the lives of creatures across the ages, is a reminder of how incredible this planet is. What was once destruction has become sanctuary.
How is this not common knowledge?
Such an unusual thing to find. Another example of a local jem?