Answer:
See below.
Step-by-step explanation:
- Belemnites is a genus of an extinct group of cephalopods
- These cephalopods existed in the Early Jurassic period from the Hettangian age (196.5–199.6 million years ago) to the Toarcian age (175.6–183.0 million years ago).
- Therefore, the discovered rock could be anywhere from 175.6 - 196.5 million years old