A breakthrough method using dinosaur eggshells is revolutionizing how scientists date ancient fossils. Researchers led by Ryan Tucker of Stellenbosch University have successfully employed uranium-lead radioisotopic dating on fossilized eggshells to determine their burial age. This technique reveals the time sediments covered the eggs, providing a direct timeline for any fossils found in the same layer.

Published in Nature Communications Earth & Environment, this approach significantly expands the potential for radioisotopic dating across vast stretches of continental sedimentary rock, which were previously difficult to date accurately. The method leverages the unique microstructure of calcium carbonate in eggshells, which preserves a record of diagenetic changes like water damage and compaction fractures, making it easier to assess age. Uranium-lead dating is the key innovation, offering precision for rocks ranging from millions to billions of years old.