According to Baidu Encyclopedia, after the death of dinosaurs, the organic parts in the remains were decomposed, and the surface of feces was rich in phosphate, which would not be decomposed. After deposition and burial, it is the best condition to form fossils, so it is easy to form fossils.
Dinosaurs refer to dinosaurs, also known as dinosaurs, which can be divided into two branches: ornithopoda and sauropoda.