New fossils provide snapshot of the beginning of complex animals that led to us
AP News • • general
Key Points:
- Over 700 fossils discovered in Yunnan, China, dated to 539 million years ago, reveal that complex, three-dimensional animals existed during the late Ediacaran period, millions of years earlier than previously thought.
- These fossils show early animals with bilateral symmetry, a key trait of most modern animals, providing the first direct evidence of such body plans before the Cambrian explosion.
- The findings help reconcile the "rocks versus clocks" debate by aligning genetic data with fossil evidence, suggesting that the emergence of complex animals occurred earlier than fossil records had indicated.
- Scientists are now focused on understanding the mechanisms and environmental factors that triggered this rapid diversification of animal life, including the role of oxygen levels and evolutionary genetics.
- The research underscores how early animal interactions, such as predation and sediment disturbance, fundamentally transformed Earth's ecosystems, laying the groundwork for modern life.
