ichnographic

例句：

1. 1. The ichnographic record of the ancient marine ecosystem is crucial for understanding its evolution.
   古代海洋生态系统的化石记录对于理解其演变至关重要。
2. 2.Paleontologists use ichnography to study the fossils found in rocks.
   古生物学家使用化石地层学来研究岩石中发现的化石。
3. 3. The discovery of a new species of ammonite has provided valuable insights into the history of marine life.
   新发现的一种有孔虫物种为研究海洋生物的历史提供了宝贵的见解。