Stuff to remember (Fossils)

Index Fossils- Living being's fossils that have survived for a short period of time but that also had a huge geographic expansion. These factors make them easy to date. Index fossils can also give us information related to the absolute age of the rocks they were founded in. example: amonite

Environment Index Fossils- Fossils that allow paleontologists to understand the climate conditions in which the rocks that contain them were formed. example: coral fóssil