恐龙生活在距今2亿年到7千万年前的中生代。它们死亡之后的尸体大都被风吹日晒雨淋等风化作用化为乌有,只有那些死在水中而且又很快被泥沙等沉积物掩埋的遗体才能得以保存。这时还需要地壳下降,将埋藏有恐龙遗体的地层沉降到一定的深度,那里温度、压力 Dinosaurs live in Mesozoic from 200 million years ago to 70 million years ago. Most of the bodies after their death were destroyed by weathering such as wind, sun and rain, and only those bodies that died in the water and were quickly buried by sediments such as sediment can be preserved. At this time also need to descend the earth’s crust, will be buried with dinosaur remains of the settlement to a certain depth, where the temperature and pressure