Researchers Found Ancient Capybara Tooth in Atacama
A fossil discovery from the late Miocene indicates the desert once supported freshwater ecosystems.
Updated on Sept. 18, 2026 in Geography
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Researchers discovered an 8.8 million-year-old fossilized capybara tooth in Chile's Atacama Desert. The find, documented in a September 2026 study, reveals that the region hosted freshwater habitats during the late Miocene.
Why it matters
The presence of a semiaquatic animal tooth suggests that the area, now one of the world's oldest non-polar deserts, was significantly wetter millions of years ago. This shifts understanding of how the region's ancient landscape connected to the rest of South America.
The fossil was identified as belonging to the genus Cardiatherium and found within shallow marine sediment layers. Researchers also recovered evidence of ancient palms and flowering plants at the same site.
The players
Bahía Inglesa Formation
This is a geological site in Chile known for its diverse paleontological deposits.
The details
By analyzing sediment layers in the Bahía Inglesa Formation, researchers identified the tooth as coming from a member of the Cardiatherium genus. This evidence confirms that capybaras, which require aquatic environments, thrived in a region that has been considered hyper-arid for 40 million years.
Timeline
The capybara lived approximately 8.8 million years ago.
The region featured wetter ecosystems during the late Miocene.
The findings were published in Scientific Reports in September 2026.
The Big Picture
This discovery updates the established ecological timeline of the late Miocene climate transition in South America. It challenges previous assumptions about the timing and reach of hyper-arid conditions in the region.
While this fossil remains a scientific discovery, it provides a clearer baseline for understanding long-term environmental shifts. Researchers plan to use this data to better model the connectivity of ancient ecosystems across the continent.
The takeaway
The discovery illustrates that even the world's most stable arid regions have experienced massive ecological transformations over geological time. It emphasizes the importance of sedimentary analysis in reconstructing the lost habitats of the Miocene epoch.
Further reading
For more on how ancient environments are mapped, visit our Geography section.
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