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Can You Keep a Dinosaur Fossil You Find?

Can You Keep a Dinosaur Fossil You Find?

It’s the question every aspiring fossil hunter asks: if I find a dinosaur bone, do I get to keep it? The answer depends almost entirely on where you find it. The legal rules are straightforward once you understand them, but the consequences of getting it wrong are severe --- including federal felony charges.

Federal Land: No, You Cannot Keep It

If you find a dinosaur fossil --- or any vertebrate fossil --- on federal land (Bureau of Land Management, National Forest, National Park, National Monument, Army Corps of Engineers, or any other federally managed property), you may not collect it.

The Paleontological Resources Preservation Act (PRPA) of 2009 makes it illegal to excavate, remove, or damage vertebrate fossils on federal land without a research permit. These permits are issued only to qualified paleontologists affiliated with approved museum or university repositories. There is no recreational or hobbyist permit for vertebrate fossils on federal land.

Penalties under the PRPA:

  • First offense: fines up to $50,000
  • Subsequent or aggravated offenses: fines up to $500,000 and imprisonment up to 10 years
  • Forfeiture of all fossils and equipment used in the violation

There is one important exception: casual collection of reasonable quantities of invertebrate and common plant fossils is permitted on BLM and National Forest land for personal use, without a permit. This means you can pick up brachiopods, clam shells, leaf impressions, and similar common fossils. But the moment you’re dealing with bone, teeth, tracks, or any vertebrate material, the rules change completely.

National Parks and National Monuments prohibit all fossil collecting, including invertebrates, without a research permit.

State Land: It Depends

Rules vary significantly by state. Some key examples:

  • Montana restricts vertebrate fossil collection on state trust lands and requires permits.
  • Wyoming considers fossils on state land to be state property.
  • Utah prohibits unauthorized vertebrate fossil collection on state lands.
  • South Dakota has specific statutes addressing fossil resources on state land.

Before collecting on any state-managed land, contact the relevant state land office or geological survey for current regulations. Never assume state land follows the same rules as private land.

Private Land: Yes, With Permission

Here’s the good news. Fossils found on private land belong to the landowner. This is well-established in American property law. If you have the landowner’s permission --- ideally in writing --- you can legally collect dinosaur fossils on their property and keep them.

This is how the majority of amateur and commercial dinosaur collecting in the United States happens. Ranchers and landowners in fossil-rich states like Montana, Wyoming, and South Dakota frequently grant access to collectors, sometimes for free and sometimes for a fee or a share of any significant finds.

Best practices for private land collecting:

  • Get written permission. A simple signed letter or email confirming the landowner’s consent protects both parties.
  • Clarify ownership of finds. Agree in advance about who keeps what, especially if a significant specimen is found.
  • Respect the land. Close gates, avoid damaging crops or grazing land, and fill in any excavation holes.
  • Know the exact property boundaries. Private land in the West often borders federal BLM land. Accidentally crossing onto federal land with a bag of dinosaur bones is a federal offense, regardless of intent.

No discussion of dinosaur fossil law is complete without the story of Sue, the most complete Tyrannosaurus rex ever found, and the legal battle that reshaped fossil collecting in America.

In August 1990, fossil hunter Sue Hendrickson discovered an enormous T. rex skeleton eroding out of a cliff on a ranch near Faith, South Dakota. She was working with the Black Hills Institute of Geological Research, a commercial fossil company led by Peter Larson. The Black Hills Institute paid ranch owner Maurice Williams $5,000 for the right to excavate the specimen.

What followed was a decade of legal chaos:

  • Maurice Williams’ ranch was held in trust by the federal government as part of the Cheyenne River Sioux Reservation’s trust land system. This meant the fossil was technically federal trust property, not purely private property.
  • In 1992, the FBI and National Guard raided the Black Hills Institute and seized Sue, along with thousands of other fossils and business records.
  • Peter Larson was eventually convicted on customs charges (unrelated to Sue specifically) and served 18 months in federal prison.
  • The courts ruled that Sue belonged to Maurice Williams as the landowner/trust beneficiary, not to the Black Hills Institute.
  • In 1997, Sue was sold at Sotheby’s auction for $8.36 million to the Field Museum of Natural History in Chicago, where she remains on display today.
  • Maurice Williams received the auction proceeds.

The Sue case demonstrated several critical lessons:

  1. Land ownership and mineral/fossil rights can be complicated, especially on tribal trust land.
  2. Written agreements about fossil ownership must be legally thorough.
  3. Federal authorities will aggressively prosecute what they view as illegal fossil collection.
  4. A $5,000 handshake deal can become an $8 million legal nightmare.

The Commercial Fossil Trade Controversy

The buying and selling of dinosaur fossils is legal in the United States when specimens come from private land. It is also deeply controversial within the paleontological community.

Arguments for commercial collecting:

  • Commercial collectors find specimens that would otherwise erode and be lost to science
  • Private landowners have a right to profit from resources on their property
  • Commercial preparation labs often produce superbly prepared specimens
  • Some commercial collectors donate or sell important specimens to museums at below-market prices

Arguments against:

  • When fossils become commodities, prices rise beyond what museums and universities can afford
  • Provenance data (exact location, stratigraphic position, associated specimens) is sometimes lost in commercial collection
  • Scientifically important specimens end up in private collections inaccessible to researchers
  • The auction of Stan the T. rex for $31.8 million in 2020 (to an undisclosed buyer later revealed to be connected to Abu Dhabi) alarmed paleontologists who fear losing major specimens to private buyers

This debate has no easy resolution. Both sides make valid points, and the tension between property rights and scientific access continues to shape fossil policy in the United States.

What to Do If You Find Something Significant

If you’re legally collecting on private land and you find what appears to be a significant dinosaur fossil --- a skull, an articulated skeleton, a new species, or an unusually complete specimen --- here is what you should do:

  1. Stop excavating. Significant specimens require professional excavation techniques to preserve their scientific value. Improper removal can destroy crucial data.
  2. Document everything. Photograph the specimen from multiple angles with a scale bar. Record GPS coordinates. Note the rock type and the position of the fossil within the rock layer.
  3. Contact a paleontologist. Reach out to the paleontology department at a nearby university or natural history museum. Most paleontologists are eager to examine potentially significant finds.
  4. Consider the science. If your find is truly important, think about making it available for scientific study. You don’t have to donate it, but allowing researchers access --- or selling/donating to a museum --- ensures the specimen contributes to human knowledge.
  5. Get a professional appraisal if you’re considering selling. The commercial fossil market ranges from a few hundred dollars for common fragments to millions for exceptional specimens. Don’t accept an offer without understanding what you have.

The Bottom Line

  • Federal land: You cannot keep vertebrate fossils. Period.
  • State land: Check your state’s specific regulations before collecting.
  • Private land with permission: You can keep what you find, and it’s yours to study, display, sell, or donate.
  • When in doubt about land status: Don’t collect. Walk away, note the location, and verify ownership before returning.

The legal framework exists to balance scientific preservation with private property rights. Understanding these rules isn’t just about avoiding trouble --- it’s about being a responsible member of the fossil collecting community. The most important dinosaur fossil is always the next one waiting to be found, and how we handle these discoveries determines whether they advance science or become cautionary tales.