Remarkably, fossil shark teeth are also incredibly abundant. Sharks ruled the earth's oceans for 400 million years, and every individual grows and sheds thousands of teeth in their lifetime.

Fossils and shark teeth in every shovel full ... after transferring from Georgia Bill and Melinda Gates gave their kids a strict ‘middle-class' upbringing, refused to just 'buy them things ...

Our study was one of the first to date Florida coastal deposits using fossil shark teeth and a technique that looks at variations in ocean strontium. Strontium is a chemical element that occurs ...