John Serrao/SCIENCE PHOTO LIBRARY
Pine forests are a familiar sight in the Northern Hemisphere
The charred pine twigs date back 140 million years to a time when fires raged across large tracts of land.
Pine trees now dominate the forests of the Northern Hemisphere.
The research suggests the tree's evolution was shaped in the fiery landscape of the Cretaceous, where oxygen levels were much higher than today, fueling intense and frequent wildfires.