Dinosaur eggshells can reveal the age of other fossils

Fossilized dinosaur eggshells can be used to determine the age of surrounding rocks and other fossils. Researchers have developed a method that analyzes the microstructure of the calcium carbonate in eggshells, which captures the physical and chemical changes that occurred during fossilization. This approach could significantly expand the range of continental sedimentary successions that can be dated using radioisotopic techniques.