Fossil Leaf, Glendive Montana

Beringiaphyllum cupanioides     Fort Union Formation     Glendive, Montana     Paleocene   Fort Union Formation leaf fossils from the Paleocene epoch (approx. 60 million years old) are commonly and naturally brown, ranging from dark brown to reddish-orange. These fossils are usually preserved as iron-stained impressions or carbonizations in shale or siltstone, creating a high-contrast brown-on-gray appearance.