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Fossil Leaves Reveal 100,000-Year Forest Recovery
7 Sep
Summary
- Wyoming's ancient forest lost 60% of its canopy during a past warming event.
- It took over 100,000 years for the forest to regain its former diversity.
- Fossil leaves provide a rare, detailed look at past ecosystem responses to warming.
Deep within Wyoming's rock record, fossil leaves tell a story of rapid global warming. Approximately 56 million years ago, during the Paleocene Eocene Thermal Maximum (PETM), a lush subtropical forest experienced a devastating loss of about 60 percent of its canopy.
New research, analyzing tens of thousands of fossil leaves from the Bighorn Basin, shows this ancient ecosystem did not recover quickly. The study, published in Science, indicates that it took more than 100,000 years for the forest to regain its former diversity and structure.
This detailed look at past forest resilience highlights that even after temperatures eventually decreased, the biological impacts of extreme warming persisted for millennia. The findings serve as a cautionary parallel for how modern forests might respond to current climate change pressures.
