Fossils Found in Old Mining Cores Just Answered One of Science's Biggest Questions
Indian Defence Review • • science
Key Points:
- Researchers analyzed over 12,000 microscopic eukaryote fossils from 1.7-billion-year-old mudstone cores in northern Australia, providing the oldest known evidence of complex cells on Earth.
- The study found that early eukaryotes lived predominantly in oxygenated seafloor environments, as fossils were nearly absent from oxygen-depleted sediments, indicating a benthic lifestyle.
- These findings challenge previous assumptions by demonstrating that oxygen was essential for the evolution of complex eukaryotic cells due to its role in aerobic energy production.
- The research suggests that early eukaryotes were confined to oxygen-rich benthic habitats for much of the Proterozoic eon and only later expanded into planktonic open-water environments during the Neoproterozoic era.
- This ecological confinement may explain the fossil record gap between the appearance of eukaryotic body fossils and molecular biomarkers, shedding light on early eukaryote evolution and environmental conditions.