Abstract:

It is a significant subject of astronomy, geology, biology and other disciplines about dinosaur extinction. There are about 130 kinds of theories about dinosaur extinction which could roughly be summarized for extraterrestrial and terrestrial factors and the factor of physiological structure of dinosaurs. The first kind of factors mainly refer to the impact of asteroid or comet impact and sunspot. The second kind of factors include volcanic eruptions, plate tectonics and climate change. And the third kind of factors mainly refer to eggshell morbid or the imbalanced ratio of male and female. The theory of asteroid impact became the mainstream version, for the iridium anomaly in Cretaceous-Paleogene (K/Pg) boundary. Evidences of eggshell, continuous transition of K/Pg, and deposition of the global ocean made asteroid impact being questioned gradually. It is easily to find out that every species have the trend of extinction when we make a general survey of geo-history evolution. Therefore, we should analysis the factors about dinosaur extinction.