The Beartooth Plateau near Yellowstone National Park is home to some of the oldest exposed rocks on Earth. Some are covered in patches of ice that are now melting, revealing secrets concealed for centuries. But scientists are in a race against time to study and learn from them. “You know, we just have a few years to try to look at these archives and learn what we can from them before they're gone,” Montana State University researcher David McWethy said.