If you find dinosaur bones on your private property in the United States, they’re legally yours. Unlike fossils on federal land, which belong to the government, fossils found on private land are treated the same as any other private property. You can keep them, sell them, donate them, or even destroy them. But what you do in the first hours and days after a discovery can dramatically affect both the scientific value and the dollar value of the find.
Why Private Land Is Different From Public Land
U.S. law draws a hard line between federal land and private land when it comes to fossils. The Paleontological Resources Preservation Act makes fossils on federal land government property. Removing a dinosaur bone from a national park or Bureau of Land Management tract without a research permit is a federal crime, and even permitted researchers can’t keep what they find. Those fossils go to museums, universities, or other public institutions.
Private land operates under completely different rules. Collection on private property is largely unregulated at the federal level, and most states don’t impose restrictions either. A landowner has full authority over paleontological objects found on their property. That means you could, in theory, find a one-of-a-kind, 60-million-year-old T. rex skeleton in your backyard and sell it at auction without breaking any laws.
The Mineral Rights Question
There’s one important wrinkle: who owns the subsurface rights to your land. In much of the Rocky Mountain West and other parts of the country, properties have what’s called a “split estate.” You own the surface, but the federal government or another party owns the mineral rights beneath it. If your deed doesn’t include mineral rights, you might wonder whether fossils count as minerals.
A federal appeals court settled this question in 2020. The case involved a Montana ranch where the surface owners and the mineral rights holders both claimed ownership of dinosaur fossils. The Montana Supreme Court ruled that dinosaur fossils are not within the “ordinary and natural meaning” of the word “mineral,” and the Ninth Circuit agreed. Fossils belong to whoever owns the surface estate. So even if your mineral rights are held by someone else, the bones are still yours. That said, checking your deed for any unusual restrictions or easements is a reasonable first step after a discovery.
What the Bones Could Be Worth
Dinosaur fossils from private land have sold for staggering amounts. Sue, the famous T. rex, sold at auction in 1997 for $8.4 million. More recently, well-preserved specimens have fetched tens of millions. But the vast majority of fossil finds are worth far less in monetary terms, even if they’re scientifically important. A single fragment of common dinosaur bone won’t make you rich. A largely complete skeleton of a rare species could be a different story entirely.
The financial value depends heavily on completeness, rarity, species, and condition. It also depends on something you can easily destroy without realizing it: context. A fossil’s position in the rock layers, the surrounding sediment, and nearby plant and animal remains all contribute to its story. Professional paleontologists map, photograph, and record this information during excavation. A bone ripped from the ground without that documentation loses both scientific significance and market value. Auction houses and serious buyers want provenance, and “I dug it up with a shovel” isn’t a compelling sales pitch.
What to Do (and Not Do) Right Away
If you spot something that looks like bone protruding from rock or soil, the single most important thing is to leave it in place. Don’t dig around it, pry it loose, or try to clean it. Fossils that have been stable underground for millions of years can deteriorate quickly once exposed to air and moisture, and amateur excavation almost always damages specimens. The guiding principle in paleontology conservation is that minimal intervention is best.
Instead, take photos from multiple angles, note the exact location, and cover the exposed area loosely with soil or a tarp to protect it from weather. Then contact your nearest natural history museum or a university paleontology department. Many states also have a state paleontologist or geological survey office that can point you in the right direction. Professionals can assess whether the find is significant and discuss excavation options. Most of the time, fossils are only partially uncovered on site. The standard practice is to remove them in blocks, often protected by plaster jackets, and transport them to a lab for careful preparation.
Working With Scientists vs. Going It Alone
You’re under no legal obligation to involve scientists, but there are strong reasons to do so. A professional excavation preserves the stratigraphic context (the information encoded in the surrounding rock layers) that tells researchers how and when the animal was buried, what ecosystem it lived in, and what other species were present at the same time. This context is what separates a museum-quality specimen from a conversation piece on your mantle.
Many landowners negotiate agreements with museums or universities. These can take different forms. Some landowners donate the specimen in exchange for a tax deduction. Others allow excavation in exchange for a cast or replica, naming rights, or a share of any future revenue. Some simply grant access and retain full ownership of whatever comes out of the ground. The terms are entirely up to you and the institution.
Selling Your Find
If you want to sell, the commercial fossil market is well established. Auction houses like Christie’s, Sotheby’s, and Bonhams have all handled dinosaur specimens. Private dealers specialize in vertebrate fossils. You’ll want clear documentation: proof of land ownership, evidence the fossil came from your property, and ideally a professional appraisal. Buyers will also care about preparation quality, so having the specimen cleaned and stabilized by an experienced preparator adds value.
The commercial fossil trade is controversial in the paleontology community. Scientists argue that fossils sold to private collectors are effectively lost to research, and that high auction prices encourage destructive amateur digs on private land. Collectors and commercial hunters counter that private landowners have the right to profit from their property and that the market funds excavations that would otherwise never happen. This tension has no legal resolution. The law is clear that you can sell what you find on your land.
Donating for a Tax Deduction
If you’d rather see your find in a museum, donating it can offer a significant tax benefit. The IRS allows charitable deductions for donated property, but fossils almost always require a qualified appraisal. For any noncash donation valued above $5,000, you need an appraisal from a qualified appraiser that meets federal standards, and you must file Form 8283 with your tax return. If the claimed value exceeds $500,000, you’re required to attach the full appraisal to your return.
The appraisal must be signed and dated no earlier than 60 days before the donation and no later than the filing deadline for the return claiming the deduction. Finding an appraiser with experience in paleontological specimens is essential, since this is a niche area where general antiques appraisers may not have the expertise to establish fair market value.
Why Acting Carefully Matters More Than Acting Fast
The gap between a carefully handled discovery and a botched one can be enormous, both in dollars and in scientific impact. Fieldwork done right includes preserving the fossil’s position, collecting rock samples, and documenting the surrounding geology. A professional team can determine whether additional bones are nearby, whether the site represents a single animal or a group, and whether the rock formation holds other significant material. Rushing to pull a bone from the ground risks cracking the specimen, losing associated bones, and erasing the geological record that gives the find its meaning.
Your property, your fossil, your call. But the smartest move is almost always the same: take a photo, cover it up, and make a phone call before you pick up a shovel.