Fossilized Feces Reveal the Hidden History of Our Planet's Ecosystems The Cambrian period, which began around 540 million years ago, marked a pivotal moment in the history of life on Earth.
It was during this time that the ancestors of modern animals emerged, and with them, complex ecosystems evolved.
The study of fossilized feces, or coprolites, has shed new light on the importance of these ancient relics in understanding early ecosystems.