Fossilized Shark's Tooth
Sharks have inhabited this planet for more than 400 million years. Their skeletons are composed of cartilage, and so most of the remains we have of pre-historic sharks is their bony teeth. These are found in abundance in some areas because shark lose teeth and grow new ones throughout their lives.
The bony teeth of sharks fossilize well and these are common in some environments. These shark's teeth are from the Paleocene Period and were found in Morocco.
It takes approximately 10,000 years after the shark has lost the tooth and it has been buried in sediment to become a fossil.
Shark Tooth Pendant