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Ancient Forest Discovered Beneath Falkland Islands Raises New Questions About Climate History
In a surprising discovery, researchers have unearthed fossilized tree trunks buried nearly 20 feet (6 meters) beneath the ground on the Falkland Islands, a windswept archipelago in the South Atlantic known for its barren landscape. The finding suggests the islands, which have been devoid of trees for tens of thousands of years, were once home to a temperate rainforest, a stark contrast to their current environment.
Dr. Zoë Thomas, a physical geography lecturer at the University of Southampton in the UK, led the research team. The discovery was made in 2020 after a friend informed Thomas of tree trunks unearthed during construction work near Stanley, the Falklands’ capital. “We thought that’s really weird because one of the things about the Falklands is that no trees grow,” said Thomas.
The tree remains were so well-preserved they initially appeared like driftwood. However, the researchers knew they were ancient, given the lack of trees on the Falklands for millennia. Upon investigation, Thomas and her team discovered that the trees dated back between 15 million and 30 million years, indicating a once much wetter and warmer climate on the islands.
The fossils were too old for radiocarbon dating, so the research team analyzed microscopic pollen and spores found in the surrounding peat layers. This method allowed them to estimate the trees’ age. The analysis suggested that the Falklands once supported a cool, wet forest similar to modern Patagonia, with species of beech and conifer trees.
Michael Donovan, paleobotany collections manager at Chicago’s Field Museum, noted that the pollen and spores provided clear evidence of this ancient ecosystem. “The fossil pollen, spores, and wood presented in this study paint a much different picture of the ancient environment,” Donovan said.
The reason trees no longer grow on the Falklands remains unclear. The islands are located at the same latitude as parts of South America where trees flourish. The study suggests that the islands’ strong winds and acidic peat-rich soil may be contributing factors.
The discovery could offer important insights into climate change. The Falkland Islands are positioned near Antarctica and in the path of westerly winds that affect atmospheric circulation and precipitation. Understanding how these winds have shifted in the past could help researchers predict future climate changes.
However, a return to forested landscapes on the Falklands seems unlikely. Projections indicate the region will become warmer but also drier, posing risks to the islands’ sensitive peatlands, Thomas said.
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