恐龙蛋化石藏着什么秘密（唠“科”）

Group 1 - The article discusses the discovery of a significant number of dinosaur egg fossils in the Qinglong Mountain area of the Qinling Mountains, estimated to be at least 300,000, making it the largest known concentration of dinosaur egg fossils in the world, referred to as the "Terracotta Army of the Cretaceous" [1] - Scientists have determined that these dinosaur egg fossils date back to between 87.65 million and 84.17 million years ago, marking the first precise dating of such fossils [1][2] - The method used for dating involves a technique called in-situ laser ablation uranium-lead isotopic dating, which allows for accurate measurement without damaging the fossils, thus preserving their integrity [2] Group 2 - Research advancements have led to a better understanding of the origin and evolution of dinosaur eggshell structures, as well as insights into dinosaur reproduction and extinction [3] - Abnormalities in eggshell structures found in Guangdong indicate potential reproductive system issues in dinosaurs, possibly linked to heavy metal contamination from volcanic eruptions, which may have contributed to their extinction [3]