pisolitic structure

例句：

1. 1. The rock is made up of layers of different kinds of rocks, which makes it a pisolite structure.
   这种岩石由不同种类的岩石层组成，因此是一种页岩结构。
2. 2.The fossils found in the cave are pisolite, indicating that they lived in a shallow seabed environment.
   洞穴中发现的化石是页岩质的，这表明它们生活在浅海床环境中。
3. 3. The pisolite formation is formed by the compaction of sedimentary rocks over millions of years.
   页岩形成是由数百万年的沉积岩压实形成的。