Black Hills Institute of Geological Research
A South Dakota paleontological research and commercial fossil organization known for excavating, preparing, exhibiting, and selling dinosaur specimens and museum-quality replicas.
Last updated August 31, 2026
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Overview
Black Hills Institute of Geological Research, commonly abbreviated BHI, is a privately held paleontological and geological organization based in Hill City, South Dakota. Founded in 1974, it combines scientific fieldwork with the commercial preparation and sale of fossils and replicas. Its activities include locating and excavating fossil material, stabilizing and preparing specimens, producing casts and reconstructions, and supplying original fossils or museum-quality replicas to institutions, collectors, educators, and other customers. The organization became particularly prominent through its work with large dinosaur specimens, especially Tyrannosaurus rex. BHI is associated with the excavation and preparation of several unusually complete T. rex skeletons, including Sue, Stan, and Trix. These specimens helped make the commercial fossil trade more visible to the general public while also raising questions about ownership, scientific access, public auctions, and the boundary between research institutions and private fossil businesses. BHI’s best-known episode involved Sue, a T. rex specimen excavated in South Dakota. In May 1992, federal authorities seized the remains from BHI. The specimen was subsequently auctioned in 1997 to Chicago’s Field Museum of Natural History for $7.6 million, at that time the highest price paid for a fossil. The case became one of the most widely discussed ownership disputes in modern dinosaur collecting and contributed to public debate about the legal status and disposition of scientifically important fossils. In March 1992, BHI’s owners also founded the Black Hills Museum of Natural History in Hill City. The museum is a nonprofit institution governed by an independent board of directors and is separate in governance from the private institute, although the two organizations share a close historical connection. The museum provides a public-facing setting for fossils and natural-history interpretation, while BHI operates as the research, preparation, and commercial organization. The institute later became involved in an internal shareholder dispute. In 2012, president Peter Larson dismissed his brother Neal Larson from the company following personal differences. Neal Larson, who held a 35 percent interest, sued in 2015, alleging shareholder oppression and seeking liquidation or a buyout. A court found that his shareholder rights had been violated when he was excluded from the meeting at which he was dismissed. Because BHI lacked sufficient cash for an immediate buyout, its fossil holdings were appraised. The dispute ultimately resulted in Neal Larson receiving the T. rex specimen known as Stan, which was valued at approximately $6 million at the time. Stan was later sold for $32 million in 2020, although that subsequent sale was distinct from BHI’s original excavation and the shareholder litigation. BHI’s positioning is therefore unusual: it is neither solely a museum nor solely a conventional geological research body. It operates at the intersection of paleontological field research, fossil preparation, educational display, scientific contracting, and the private market for original fossils and replicas. Its reputation rests on technically demanding excavation and preparation work, high-profile dinosaur material, and participation in the institutional and commercial circulation of fossils.
History
Black Hills Institute of Geological Research was established in 1974 in South Dakota as a private organization focused on geological and paleontological work. Its activities developed around the recovery and preparation of fossil material, combining field excavation with laboratory preparation and the distribution of original specimens and replicas. This model allowed BHI to participate in scientific research and museum development while also serving the private and institutional fossil market. The institute’s profile grew substantially through its work on dinosaur fossils, especially Tyrannosaurus rex. Large dinosaur skeletons require extensive field excavation, transport, preparation, reconstruction, and interpretation. BHI became recognized for handling exceptionally complete specimens and for preparing material suitable for museum display. The institute’s name became particularly associated with Sue, Stan, and Trix, three prominent T. rex specimens connected with its excavation or preparation work. Sue became the subject of a major ownership and custody controversy. In May 1992, the Federal Bureau of Investigation seized the specimen from BHI. The fossil was later offered at public auction and acquired in 1997 by the Field Museum of Natural History in Chicago for $7.6 million. The transaction established a widely cited benchmark for fossil prices and made the legal and commercial treatment of major dinosaur specimens a subject of broad public attention. BHI’s owners founded the Black Hills Museum of Natural History in Hill City in March 1992. The museum was organized as a nonprofit and governed by an independent board of directors. Its creation provided a public educational and exhibition venue connected historically with the institute, while preserving a distinction between the nonprofit museum and the private company. The museum relationship reflects BHI’s broader role in moving fossils from field discovery and preparation into public interpretation. The institute later experienced a significant internal governance dispute. In 2012, president Peter Larson fired his brother Neal Larson after personal differences. Neal held a 35 percent company interest and brought a lawsuit in 2015 alleging that he had been oppressed as a shareholder. He sought liquidation or a mechanism to separate his ownership from the company. The court determined that his shareholder rights had been breached because he had not been invited or permitted to speak at the meeting where his removal occurred. BHI did not have enough cash to complete a straightforward buyout. As a result, the company’s fossil holdings were appraised while the dispute continued. Several years later, the court ruled that Neal Larson would receive the T. rex skeleton known as Stan, which was appraised at approximately $6 million at that time. Stan was sold for $32 million in 2020. The litigation demonstrated how fossil collections can function not only as scientific and cultural assets but also as highly concentrated corporate assets in private ownership disputes. Today, BHI is best understood as a specialist paleontological organization operating across research, excavation, fossil preparation, replica production, museum supply, and commercial sales. Its public identity is strongly shaped by high-profile dinosaur specimens, while its underlying work depends on technical preparation, reconstruction, geological expertise, and the management of fossil material. The institute’s history also illustrates the tensions inherent in privately held paleontology: scientific value, public access, museum stewardship, property law, and commercial valuation often overlap in the same specimens.
- 2020
Stan is sold for $32 million
[1]The T. rex skeleton involved in the shareholder dispute is sold for $32 million.
- 2015
Shareholder litigation begins
[1]Neal Larson files suit alleging shareholder oppression and seeking liquidation or a buyout.
- 2012
Neal Larson is dismissed
[1]President Peter Larson fires shareholder Neal Larson following personal differences.
- 1997
Field Museum acquires Sue
[1]The Field Museum purchases Sue for $7.6 million at auction.
- 1992
Black Hills Museum of Natural History is established
[1]BHI’s owners establish a nonprofit natural-history museum in Hill City under an independent board.
- 1992
Sue is seized by federal authorities
[1]The FBI takes custody of the famous T. rex remains from BHI.
- 1974
Black Hills Institute of Geological Research is founded
[1]The private South Dakota organization begins work in geological and paleontological research, fossil excavation, preparation, and sales.
Products and positioning
Paleontological research, fossil excavation and preparation, and premium fossil supply for museums, collectors, and educational institutions.
Fossils
Original fossil material
BHI excavates, prepares, and sells original fossil material, including dinosaur remains and other paleontological specimens. Such material may be supplied to museums, educational institutions, researchers, and private collectors, subject to applicable ownership and regulatory requirements.
Dinosaur fossils
Prepared dinosaur skeletons
The institute’s best-known work involves the excavation, stabilization, preparation, reconstruction, and presentation of large dinosaur skeletons. Tyrannosaurus rex specimens such as Sue, Stan, and Trix are central to BHI’s public reputation and demonstrate the technical complexity of its preparation work.
Fossil replicas
Museum-quality replicas
BHI produces or supplies replicas of important fossil specimens for museums, exhibitions, education, and collectors. Replicas allow institutions to display scientifically or commercially inaccessible originals while preserving the visual impact and educational value of complete skeletons.
Professional services
Paleontological preparation and excavation services
Beyond selling specimens, BHI’s work encompasses field excavation, fossil recovery, laboratory preparation, reconstruction, and related paleontological expertise. These capabilities support the conversion of fragile field finds into stable specimens suitable for study, exhibition, or sale.
Controversies
2015
Shareholder oppression dispute
Neal Larson sued after his dismissal from BHI, alleging that his rights as a 35 percent shareholder had been oppressed. A court later found that he had not been properly allowed to participate in the meeting concerning his removal.
1992
Federal seizure of Sue
The FBI seized the Sue T. rex remains from BHI. The subsequent auction and transfer to the Field Museum made the case a prominent dispute concerning fossil ownership, custody, and public access.
Brand decisions
2012
Dismissal of shareholder Neal LarsonOtherBackground
Personal differences developed between president Peter Larson and his brother Neal Larson, who held a substantial company interest.
Action taken
Peter Larson dismissed Neal Larson from the institute.
Aftermath
The dismissal led to shareholder litigation, findings concerning Neal Larson’s participation rights, appraisal of fossil assets, and the eventual transfer and sale of Stan.
1992
Establishment of a nonprofit museumStrategyBackground
BHI’s owners sought to create a public educational venue alongside the private institute’s research and commercial activities.
Action taken
They founded the Black Hills Museum of Natural History in Hill City and placed it under an independent board of directors.
Aftermath
The museum became a separate nonprofit institution connected historically to BHI and provided a public setting for natural-history exhibits.
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