Arrowhead & Fossil Identification
Most arrowheads are not arrowheads. The bow reached North America only 1,500 years ago — neck width tells you what you actually have.
Where you are standing decides what you may do
In the United States, collecting artifacts from federal or tribal land is a felony under the Archaeological Resources Protection Act of 1979 — surface finds included, one item included. Vertebrate fossils on federal land are protected under the Paleontological Resources Preservation Act of 2009. This is a summary and not legal advice; rules vary by state and agency and they change.
Is it an arrowhead?
Most "arrowheads" are not arrowheads
The bow reaches North America only around 1500 years ago. Everything older than that — which is the large majority of what anybody picks up — was thrown, not shot: atlatl dart points and spear points, tens of thousands of years of them. A Clovis point is 13,000 years old and had no bow to be shot from.
| Period | Years ago | Thrown or shot? | |
|---|---|---|---|
| Paleoindian | 13,500–9,000 | Atlatl only | Clovis, Folsom and their relatives. Thrown with an atlatl, often at animals now extinct. |
| Early Archaic | 9,000–6,000 | Atlatl only | Notching becomes common. Still entirely atlatl. |
| Middle Archaic | 6,000–4,000 | Atlatl only | Regional styles diverge sharply, which is what makes typology work. |
| Late Archaic | 4,000–3,000 | Atlatl only | Large stemmed forms. The commonest points in many areas. |
| Woodland | 3,000–1,000 | Both | The bow arrives partway through, so both kinds occur and size matters. |
| Late Prehistoric | 1,500–400 | Bow | Small triangular and side-notched forms. These genuinely are arrowheads. |
The discriminator archaeologists use is neck width — the narrowest part of the hafting area — because that is what has to fit into a shaft. Arrow shafts are thin and dart shafts are not, so it separates the two populations far better than overall length does. The working cutoff is about 9.5 mm. It is a boundary between two overlapping populations rather than a wall, so anything within a millimetre of it is reported here as borderline rather than decided.
The find spot is worth more than the find
A point in the ground carries its own date: the layer it sits in, what lies around it, how deep it is. Picked up and put in a tin, it becomes a pretty stone with an unknown age and an unknown story — and that information does not come back. This is not sentiment. It is why archaeology records position to the centimetre, and why a photograph in place with something for scale is worth more than the object on a shelf.
If you find something fluted, or human remains, or anything that looks like a concentration rather than a stray, the useful thing to do is stop, photograph, note the position and contact your state archaeologist. Those finds genuinely matter, and they matter most where they lie.
Is it even a fossil?
A better first question than "what species". These look-alikes are found far more often than the things they resemble, and they are what museums are handed most.
| Look-alike | Mistaken for | How to tell |
|---|---|---|
| Dendrites | Ferns, moss, plant fossils | Branching mineral crystallisation on a rock face, usually black manganese oxide. It sits ON the surface rather than in the rock, and the branching is fractal rather than anatomical — no stem, no midrib, no cell structure. |
| Concretions | Eggs, bones, skulls, turtle shells | Lumps of sediment cemented around a nucleus. Usually too symmetrical, with no internal structure when broken and no bone texture. The commonest thing brought to a museum by mistake. |
| Chert and flint nodules | Bones, worked tools | Lumpy silica nodules with a smooth glassy fracture. No cell structure, no growth lines, and no flake scars in the deliberate pattern a worked tool shows. |
| Liesegang banding | Growth rings, shells | Concentric coloured bands from iron staining diffusing through porous rock. The bands cross rock boundaries a real shell would respect. |
| Weathered pitting | Tracks and burrows | Irregular hollows from weathering. Real tracks repeat in a sequence with consistent size and spacing; weathering does not. |
If it is a fossil, what kind?
| Kind | How it formed | |
|---|---|---|
| Shell or coral | The original hard part, or calcite replacing it. | Brachiopods, bivalves, corals and crinoid stems. Far and away the commonest real fossils. |
| Mold | A cavity left where the organism dissolved away. | You are looking at the space, not the animal. Press clay in to see the original shape. |
| Cast | A mold later filled with sediment or mineral. | A copy of the outside of the organism, in whatever filled the hole. |
| Permineralised | Minerals fill the pore spaces of bone or wood. | Petrified wood and most vertebrate bone. Heavy, and it keeps internal structure. |
| Compression | Flattened organic material, often a carbon film. | Leaves and ferns in shale. Splits open along the bedding to reveal them. |
| Trace fossil | Not the organism — evidence of its behaviour. | Burrows, tracks, borings. Scientifically valuable and routinely thrown away as "just a rock". |
Trace fossils get thrown away. Burrows, tracks and borings are evidence of behaviour, which body fossils cannot give you, and they are routinely discarded as "just a rock" by people who would have kept a shell without hesitating.
The rules, by land type
| Land | Artifacts | Fossils |
|---|---|---|
| Federal land | A FELONY under the Archaeological Resources Protection Act 1979. Includes surface finds. Includes taking one. | Vertebrate fossils are protected under the Paleontological Resources Preservation Act 2009. Reasonable amounts of common invertebrates and plants are usually allowed for personal use. |
| Tribal land | Prohibited without tribal permission. ARPA applies, and human remains and funerary objects carry further protection under NAGPRA. | Requires tribal permission. Assume no unless told otherwise in writing. |
| State land | Almost always prohibited or permit-only. Rules vary by state and are usually stricter than people expect. | Varies widely. Some states allow personal collecting of common fossils, others prohibit everything. |
| Private land | Legal in most states WITH the landowner's permission, though some states protect burials and sites regardless of ownership. | Generally the landowner's property. Get permission in writing if the find might matter. |
"I only took one" is not a defence and is the commonest thing people say. If you are not certain whose land you are on, you do not know whether you are committing a felony — and land ownership on the ground is very often not what it looks like from a trail.
How to use
- Check whose land you are on before you pick anything up.
- Measure the neck, not the length — it is the better discriminator.
- Photograph anything unusual in place, with something for scale.
- Ask whether it is organic at all before asking what species.
Frequently asked questions
Is my arrowhead really an arrowhead?
Probably not. The bow reaches North America only around 1,500 years ago, so everything older than that was thrown rather than shot — atlatl dart points and spear points, covering tens of thousands of years. That is the large majority of what people find. A Clovis point is 13,000 years old and there was no bow to shoot it from.
How do I tell an arrow point from a dart point?
Measure the neck — the narrowest part of the hafting area — because that is what has to fit into a shaft. Arrow shafts are thin and dart shafts are not. The working cutoff is about 9.5 millimetres: below it the point may genuinely be an arrowhead, above it, it was thrown.
Why not just go by size?
Length overlaps badly between the two populations, because points get resharpened over their lives and a heavily reworked dart point can end up short. The hafting area does not change with resharpening, which is why archaeologists use neck width instead. It is a probabilistic boundary rather than a wall, so anything within a millimetre of the line should be treated as unsettled.
What is an atlatl?
A throwing stick that extends the arm, letting a hunter launch a light spear — a dart — with far more force than by hand. It is tens of thousands of years older than the bow and was the main projectile weapon for almost all of human history in the Americas. Its darts needed thick shafts, which is what the neck width is measuring.
Why does it matter where I found it?
Because the location IS the information. A point in the ground carries its own date in the layer it sits in, what lies around it and how deep it is. Picked up and pocketed, it becomes a pretty stone of unknown age with an unknown story, and that cannot be reconstructed. A photograph in place with something for scale is worth more than the object on a shelf.
Is it legal to collect arrowheads?
On federal or tribal land in the United States, no — it is a felony under the Archaeological Resources Protection Act of 1979, and that includes surface finds and includes taking a single item. State land is usually prohibited or permit-only. Private land is generally legal with the owner's permission, though some states protect burials regardless of ownership.
What about fossils on public land?
Vertebrate fossils on federal land are protected under the Paleontological Resources Preservation Act of 2009. Reasonable amounts of common invertebrate and plant fossils are usually allowed for personal use, but not for sale. State rules vary widely. This is a summary rather than legal advice, and the rules change.
What should I do if I find something significant?
Stop, photograph it in place with something for scale, note the position, and contact your state archaeologist. A fluted point, human remains, or any concentration rather than a stray find is genuinely important — and it is most important where it lies. Nobody will be angry with you for reporting something.
Is this rock a fossil?
Ask that before asking what species, because look-alikes are found far more often than the real thing. Dendrites look like ferns and are mineral crystallisation on a rock face. Concretions look like eggs, bones and skulls and are lumps of cemented sediment. Both are what museums get handed most.
How do I tell a concretion from a fossil bone?
Break or examine a chipped edge. Real bone has visible internal structure — a spongy core, growth lines, a distinct outer layer. A concretion is uniform sediment throughout, usually too symmetrical, and has no bone texture anywhere. If it looks like a perfect egg, it is almost certainly a concretion.
What is a trace fossil?
Evidence of behaviour rather than the organism itself — burrows, tracks, borings, coprolites. They are scientifically valuable precisely because body fossils cannot tell you what an animal did, and they are routinely thrown away as "just a rock" by people who would have kept a shell without a second thought.
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