A 319-million-year-old tissue is the oldest known vertebrate brain.
The diversity of modern animal forms that we might encounter in our day-to-day lives is only the latest chapter in hundreds of millions of years of evolution.
Fossils are therefore pivotal in reconstructing the sequence and timing of the evolution of living animals’ defining features. However, although mineralized tissues such as bone commonly fossilize, soft tissues, such as the brain and muscles, usually leave no trace. Therefore, our understanding of how living animals became how they are is incomplete.
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