That split second when you're knee-deep in surf, eyes scanning the sand for shells, and you spot something that doesn't belong. It's not a scallop, not a piece of sea glass, not a rock. It's smooth, shaped, maybe has a weird mark on it. Your heart skips a beat. For beachcombers who love history as much as a perfect sand dollar, that moment is the best part of the hobby. But the follow-up question---what even is this thing?---can feel overwhelming if you've never held a 200-year-old artifact before. The good news? You don't need a graduate degree in archaeology, a $500 reference book collection, or a permit to start identifying rare finds, and you definitely don't have to sacrifice the casual, low-pressure joy of beachcombing to do it. This handbook breaks down the simple, ethical steps every amateur marine archaeologist can use to turn that weird lump of metal or shard of pottery into a piece of living coastal history.
First, Don't Touch That (Yet): Pre-ID Steps That Save Finds (And Your Sanity)
The biggest mistake new beachcombers make when they spot a potential artifact is scrubbing off the sand, prying it out of a concretion, or moving it before they've documented anything. That sand, that concretion, even the weird smudge of algae on it? That's context, and it's the first clue you have to what the object is, and how old it might be. Start with three quick steps before you alter the find at all:
- Snap clear photos with a scale reference: a quarter, a shell, even your hand works, to show size. Take shots from all angles, and a photo of exactly where you found it, with nearby landmarks (a jetty, a specific dune grass patch, a known shipwreck marker) in frame.
- Note the exact location and conditions: jot down the GPS coordinates if you have a phone, the tide stage (high, low, mid), and any nearby features. Did you find it near a 19th century pier piling? Next to a stretch of beach that erodes heavily after winter storms? That context tells you way more than the object itself at first.
- Skip the harsh cleaning: resist the urge to scrub it with soap, chisel off concretion, or polish metal until you've done some basic research. Even a layer of sand can hide a maker's mark, a carved pattern, or clues to the material's age. If it's sharp or corroded, slip it into a small pouch or a hard case to carry home safely, no extra handling needed. Also, a quick safety and legal note: if you find anything that looks like a weapon, unmarked medical waste, or possible human remains, don't touch it, and contact local park rangers or law enforcement immediately. Many coastal regions have laws protecting historic shipwreck artifacts, so if you find something you suspect is over 50 or 100 years old, check local regulations before you remove it from the beach at all.
Build Your Reference Library (For Free, No Expensive Textbooks Required)
You don't need to drop hundreds of dollars on academic archaeology books to start identifying finds. The best resources for amateur beachcombers are local, free, and often right in your community:
- Start with your state or regional maritime heritage office: almost every coastal region has a publicly accessible database of known shipwrecks, common artifacts found on local beaches, and reporting guidelines for rare finds. Many even have free printable guides to common local artifacts you can download to your phone.
- Join local beachcombing or maritime history groups: Facebook groups, local historical society meetups, or even the regulars you see on your favorite beach are often the best resource for ID. I once spent 20 minutes picking at a lump of concretion I was sure was a colonial-era trade token, only to find it was just a rock wrapped in sand and shell fragments---my neighbor who's been combing the same beach for 30 years still teases me about it.
- Use free apps like iNaturalist, which has a growing database of marine and historical artifacts that other users can help you ID, just by uploading a photo.
- Learn the difference between common "false rare" finds first, so you don't waste time overanalyzing trash: concretion (rocky lumps of bound sand and shell that often look like cannonballs or tools), fossilized shark teeth (often mistaken for worked bone tools), and sea glass (often mistaken for worked historical glass) are the three most common misidentified finds for new beachcombers.
ID Cheat Sheet for the Most Common Rare Beach Finds
Once you've got your pre-ID steps down and your reference resources saved, you can start narrowing down what your find is, based on material and shape:
Ceramic and pottery shards
The most common rare finds on most beaches are small shards of domestic pottery from shipwrecks or eroded coastal landfills. Start by looking at three things:
- The clay body: rough, porous earthenware is usually older (pre-19th century for most regions), while smooth, fine stoneware or porcelain is often later, or from higher-status trade goods.
- Glaze and decoration: hand-painted patterns, blue transfer prints of pastoral scenes, or salt glaze (a glossy, textured finish common on 17th and 18th century storage jars) are almost always historic. If you see a small maker's mark on the back of a shard, that's a jackpot---you can cross-reference it with pottery mark databases online to narrow down exactly when and where it was made.
- Whole small vessels: tiny creamers, spice jars, or apothecary bottles are far rarer than shards, and often survive intact because they're small enough to be buried quickly by sand before waves can break them.
Metal artifacts
Metal is tricky, because it corrodes differently depending on the type and how long it's been in the water:
- Wrought iron (from ship nails, rigging, or early cannons) corrodes into a rough, flaky, layered texture, while modern steel corrodes into sharp, flaky chunks that fall apart easily. If you find a lump of corroded metal with a rough, layered texture, it's almost certainly historic wrought iron.
- Copper alloys (brass, bronze): look for a green patina (verdigris) that forms evenly, not spotty. Small brass buckles, bronze ship's bell fragments, or copper line weights are common on historic wreck sites. If you see a maker's mark or a number stamped into the metal, that can narrow down the age and origin immediately.
- Lead artifacts: small lead musket balls, lead seals used to mark cargo crates, or lead line weights are extremely common on 16th to 19th century wreck sites, and are often overlooked because they look like modern fishing weights at first glance. *Pro tip: never use harsh chemicals or power tools to clean corroded metal. Dry brush off loose sand with a soft toothbrush, and take clear photos of any markings before you do anything else---improper cleaning can erase maker's marks forever.
Worked bone, antler, and ivory
Natural whale bone, shark jaws, and sea turtle shell are common on beaches, but worked artifacts are far rarer. Look for signs of intentional shaping: smooth, polished edges, cut marks from tools, or intentional holes drilled for hanging or stringing. Small fish hooks, decorative pendants, or tool handles carved from whale bone or walrus ivory were common on 16th to 19th century trading and fishing vessels. If you suspect you've found ivory, check local laws first: many regions restrict the sale or transport of historic ivory artifacts, and some protected species (like walrus ivory) have additional regulations.
Glass artifacts
Sea glass is ubiquitous, but historical glass artifacts are a different story. Look for these clues to tell them apart:
- Pontil marks: the rough, raised scar on the bottom of a hand-blown glass bottle, where the glassblower held it during shaping. Any glass with a pontil mark is pre-20th century, and a rare find on most beaches.
- Color and bubbles: old glass is often thinner than modern glass, has more tiny air bubbles trapped inside, and has uneven color (modern glass is almost uniformly colored). Small glass insulators from 19th century telegraph lines, or Japanese glass fishing floats with kanji markings are two of the most sought-after rare glass finds on coastal beaches.
What To Do When You Find a Rare Artifact
If you've narrowed down that your find is likely historic and rare, the next steps are about ethics and contributing to real research, not just adding to your personal collection: First, don't post the exact GPS location of your find publicly. Looters often monitor social media groups for posts about rare artifacts, and will strip a site of all its historical value in days if they know where it is. Next, report it to your local maritime heritage office or state archaeologist. Almost every coastal region has a formal process for reporting finds, and many will even help you ID the artifact for free, and add it to their public database of coastal finds. Amateur beachcombers have discovered entire shipwrecks and rare cargo artifacts that professional archaeologists never would have found, because we're out on the beaches every day, noticing small changes in the shoreline that no scheduled survey would catch. If you're interested in getting more involved, many university maritime archaeology programs welcome volunteer beachcombers to help survey eroding shoreline sites, and some even let trained volunteers participate in formal excavations of small, low-risk wreck sites.
The Best Part? You Don't Have To Be an Expert To Make a Difference
At the end of the day, the goal of amateur marine archaeology isn't to build a personal collection of rare artifacts, or to prove you're smarter than the other beachcombers on the sand. It's to connect with the history of the coast you love, and to make sure that the small, fragile pieces of that history don't get lost to erosion, looting, or neglect. You don't have to find a cannon or a chest of silver coins to make a difference. Even a single shard of 18th century pottery, a brass buckle, or a lead musket ball tells a story: of the people who sailed these waters, of the storms that sank their ships, of the centuries that object spent tumbled in the waves before you found it. The best identification skill you can have as an amateur marine archaeologist isn't the ability to name every artifact you find---it's the curiosity to stop, look, and ask questions about the history hidden in the sand. Next time you're out on the beach and spot something weird, don't just walk past it. Pick it up, take a photo, jot down where you found it. You never know what piece of history you're holding.