Why Are There So Many Shark Teeth on Manasota Key?

The Peace River Formation and fossil layer

Manasota Key sits atop the Peace River Formation, a geological layer packed with Miocene-era fossils. Over millions of years, ocean currents and storms have eroded this formation, releasing countless shark teeth onto the beaches. Every tide and storm brings fresh teeth to the surface — which is why you can hunt the same beach repeatedly and always find more.

Why teeth survive for millions of years

Shark teeth are made of dentin and enamel — incredibly hard materials designed to last. When a shark loses a tooth (sharks lose thousands in their lifetime), it sinks to the seafloor and gets buried in sediment. Over millions of years, minerals replace the organic material, turning the tooth into a fossil. The dark black or brown color of Manasota Key teeth comes from minerals absorbed during fossilization.

What else you might find

It's not just shark teeth! Manasota Key beaches also yield fossilized stingray teeth, pufferfish mouth plates, dugong ribs, mammoth teeth, and even three-toed horse teeth. Every sift is a surprise — you're holding pieces of Florida's ancient past in your hands.

Want to find them yourself? Join our guided eco-tour ($69.99, daily at 9:30 AM) or rent a sifter ($30/day) and hunt at your own pace.