index fossil

例句：

1. 1. The team spent hours searching for the lost index fossil.
   团队花费了数小时寻找丢失的化石。
2. 2.The paleontologist discovered a new species of dinosaur in the fossil record.
   古生物学家在化石记录中发现了一种新物种的恐龙。
3. 3. The discovery of this index fossil has sparked renewed interest in paleontology.
   这种化石的发现重新点燃了对古生物学的兴趣。