Fossils, Shark Teeth, and Beachcombing

Fossils and shark teeth

Fossil hunting is the rare branch of treasure hunting where the law is mostly on your side and the finds are often lying in plain view. Erosion does the digging for you, surf and river current keep tumbling fossils out of old sediment and dropping them where a sharp eye can spot them.

The classic grounds are coastal and riverine. Calvert Cliffs in Maryland sheds shark teeth, including megalodon, along its eroding shoreline. Florida's Peace River and Venice beaches give up shark teeth and Ice Age bone. Inland quarries and fossil parks let you dig trilobites and Mazon Creek nodules. Just mind the permits: Florida wants a cheap permit for vertebrate fossils, though shark teeth and shells are free to collect.

Identifying a fossil

Holding something that might be a fossil and not knowing is half the thrill of fossil hunting. Identifying it is a matter of looking for the tells that separate ancient life from ordinary rock.

Start with shape and pattern. Fossils preserve the forms of living things, the ribs of a shell, the segments of a trilobite, the serrations of a tooth, the growth rings of coral, patterns too regular and biological to be random rock. Fossil shells and teeth often differ in color, texture, and weight from the surrounding stone. Where you found it matters too, since fossils come from sedimentary rock and specific formations, so the location narrows the possibilities fast.

When in doubt, photograph it with something for scale and ask. Museums, university geology departments, fossil clubs, and online communities identify finds all the time, and they love doing it.

Megalodon

The megalodon tooth is the trophy of fossil hunting, a palm-sized blade from the largest shark that ever lived, and people are always surprised by how old, and how findable, they are.

Megalodon ruled the oceans from roughly twenty-three million to about three and a half million years ago, so any megalodon tooth you find is millions of years old, a true piece of deep time. They turn up because the species shed and replaced teeth constantly through life, leaving countless teeth in the sediments that are now coastal cliffs and riverbeds. The classic grounds are places like Calvert Cliffs in Maryland and Florida's rivers and beaches, where erosion keeps washing them out.

A real megalodon tooth is heavy, fossilized to stone, often dark, with a distinct triangular crown and a chevron-shaped band where the root meets the blade, called the bourrelet. Size and condition drive value, and a big, undamaged tooth is a prize.

Arrowheads

Arrowheads and stone tools pull at people the way few finds do, a thing shaped by a human hand thousands of years ago. But this is exactly the category where good intentions get people in legal trouble, because Native American and historical artifacts are protected in ways that fossils are not.

The bright line: collecting Native American or historical artifacts on public land is illegal, and you should leave arrowheads, pottery, and similar items where they lie. On private land, with the owner's permission, the rules are different and often allow surface collecting, but state laws vary and anything in waterways or older than a set age can be state property. When the law is unclear, photograph it and leave it.

Sea glass

Sea glass is the ocean's own treasure, broken bottles and old glass tumbled by decades of surf into frosted jewels. The best beaches are usually old dump sites where a town once tipped its glass into the water, and the sea spent fifty years polishing the evidence into gemstones.

The legality is the catch most people miss. On beaches inside US state parks, collecting sea glass is generally illegal and can carry fines, and the most famous spot of all, Glass Beach at Fort Bragg in California, sits in MacKerricher State Park where taking glass is prohibited and rangers patrol. Other beaches allow it, often only below the mean high tide line, and many post signs asking you to leave it because it is a finite resource that no longer gets replenished.

So check before you pocket. A great sea glass beach is a place to slow down and hunt the tide line after a storm, and where the law allows, to take a frosted piece or two home.

Beach detecting

The beach is where most people start, and for good reason. Sand is easy digging, the salt water keeps dropping fresh jewelry and coins every weekend, and a lot of public beaches let you swing freely. But friendly is not the same as open everywhere, so a few minutes of checking saves a wasted drive.

Ownership is the first question. Public beaches often allow detecting, private ones do not without permission, and some coastal parks need a permit or close detecting in the busy summer season. Pennsylvania, for instance, only opens its park beaches to detectors from after Labor Day until before Memorial Day.

Then there are the no-go zones that exist to protect things, not to spoil your day: turtle and bird nesting areas, dunes, anything near a historic landmark or a known wreck. Stay off those, fill your holes, and the beach stays open for everyone.