A melting ice patch in the Rocky Mountains has revealed the remains of up to 5,900-year-old trees that could offer insights into past climate conditions, according to new research.

Scientists discovered more than 30 dead whitebark pine trees (Pinus albicaulis) that were entombed in ice for millennia, according to a new paper published late last month in Proceedings of the National Academy of Sciences.

They found the previously hidden stand of trees on the Beartooth Plateau in northwest Wyoming, which is part of the Greater Yellowstone Ecosystem. The whitebark pines were lying flat but had been preserved in good condition, suggesting they were rapidly enveloped by ice.

The trees were recently exposed when the ice patch began melting due to hotter temperatures related to human-caused climate change, reports New Scientist’s Taylor Mitchell Brown. In the same area, receding ice patches have also revealed fragments of wooden hunting weapons, including one that was more than 10,000 years old.