The Ancients
History Hit
The Cambrian Explosion: When Life Began?
In this episode of The Ancients, host Tristan Hughes is joined by paleontologist and evolutionary biologist Henry Gee to explore the Cambrian Explosion—a pivotal moment in Earth's history occurring approximately 538 million years ago. Often described as biology's "Big Bang," this period marks the sudden appearance of complex, multicellular life in the fossil record, transitioning from a world of simple organisms to one populated by diverse, mobile creatures with shells, skeletons, and eyes. The discussion highlights the shift from the mysterious Ediacaran fauna—strange, stationary creatures that preceded the explosion—to the rapid diversification of animal life. Key insights include the geological and biological catalysts for this change, such as the evolution of the through-gut, the oxygenation of the oceans, and the influx of minerals following the erosion of ancient supercontinent mountain ranges. The duo also discusses iconic Cambrian inhabitants like trilobites and the fascinating, bizarre predators preserved in the Burgess Shale, such as the anomalous Anomalocaris. By examining these early evolutionary breakthroughs, the episode provides a compelling look at the foundational events that shaped the biological complexity of our modern world.
Updated Jul 1, 2026
About This Episode
538 million years ago, life on Earth changed forever. In an evolutionary burst known as the Cambrian Explosion, complex animals rapidly appeared in the oceans, laying the foundations for almost every major animal group alive today.
Tristan Hughes is joined by the mighty Henry Gee to explore biology’s 'Big Bang'. What triggered this extraordinary leap in evolutionary complexity? Why did creatures with eyes, shells and limbs emerge so suddenly in the fossil record? And what can the Cambrian Explosion reveal about the origins of animal life and the history of our planet?
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Rise of Humans
The Age of Dinosaurs
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Presented by Tristan Hughes. Audio editor is Aidan Lonergan. The producer is Joseph Knight. The senior producer is Anne-Marie Luff.
All music courtesy of Epidemic Sounds
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