Paleozoic crudes

例句：

1. 1. The Paleozoic era is when the Earth was covered in thick layers of sediment and rock.
   古生代是地球被厚厚的沉积岩和岩石覆盖的时代。
2. 2. The Paleozoic era is also known for its rich fossil record.
   古生代也以其丰富的化石记录而闻名。
3. 3. The Paleozoic era is characterized by the appearance of dinosaurs and other ancient creatures.
   古生代以恐龙和其他古代生物的出现而著称。