protostratigraphy

例句：

1. 1. The study of protostratigraphy is crucial for understanding the geologicalhistory of our planet.
   研究古生代地层学对于理解地球的地质历史至关重要。
2. 2. Paleostratigraphy hasrevealed that the Earth's crust wasnot formed all at once, but ratherthrough a process of accretion andtectonic activity.
   古生代地层学揭示了地球地壳并非一次性形成，而是通过沉积和构造活动逐渐形成的。
3. 3. Paleostratigraphy hasbeen instrumental in unraveling themysteries of ancient life on Earth.
   古生代地层学在揭开地球上古代生命之谜方面发挥了重要作用。