9 October 2025 The Future is the Product of the Past

Nearly 300-million-year-old Oldest known fossilized reptile skin found in Oklahoma cave resembles that of modern crocodiles

Paleontologists say they’ve identified and described the oldest fossilized reptile skin ever found.

A team of paleontologists from the University of Toronto Mississauga discovered the fossilized skin of a reptile-like animal in a cave in Oklahoma. The skin fossil is estimated to be more than 20 million years older than the previous record-holder.

The finding, which is believed to be at least 286 million years old, was discovered in the Richards Spur cave system, a fascinating area of Oklahoma uniquely suited to preserve fossilized remains.

The soft tissue fossil is a rare find, made possible by a series of chance events. It provides insight into a distant evolutionary past that predates both mammals and the oldest dinosaurs.

In caves, fine sediment deposits and low oxygen levels help delay decomposition, according to lead study author Ethan Mooney, who is pursuing a master’s degree in paleontology at the University of Toronto (U of T).



📣 Our WhatsApp channel is now LIVE! Stay up-to-date with the latest news and updates, just click here to follow us on WhatsApp and never miss a thing!!



The limestone caves of Richards Spur in Oklahoma contain some of the world’s most diverse and well-preserved fossils from the Paleozoic. At that time, the caves were filled with petroleum and tar from the nearby Woodford Shale, which saturated the fossils and further protected them from decay.

Richards Spur contains many fossils of Captorhinus aguti—an iguana-size, lizardlike reptile. Most specimens are skeletons, but one C. aguti fossil described in the Current Biology study retains a portion of its epidermis—the scaly outermost layer of skin made of the same keratin found in human hair and fingernails. Mooney emphasizes the importance of developing a thick, waterproof epidermis for survival on land.

Conditions within the limestone caves of Richards Spur in Oklahoma preserved fingernail-size fragments of fossilized reptile skin.MOONEY ET AL./CURRENT BIOLOGY

While studying these fossils, the researchers discovered a series of delicate specks that U of T biologist Tea Maho mistook for bone fragments smaller than a fingernail and as thin as a human hair. However, microscopic examination revealed that it was an exceptionally well-preserved piece of reptilian skin. The 3D fossil contains an inner dermis layer, which is rarely preserved, as well as a tough epidermis with individual bands of folded scales separated by a flexible “hinge” region with no scales, which would have allowed for growth and movement.

Though they can’t say for certain what animal the skin specimen was from, Maho and Mooney have an idea. Captorhinus aguti was a lizard-like animal known to have been common in the region during the Permian Period. It had four legs, a tail, was about 10 inches long, and had an omnivorous diet–eating insects, small vertebrates, and occasionally plants. Fossilized skeletal remains of C. aguti have been found at the same site, and aspects of the skin sample are similar to features of those larger fossils.

On top of being the oldest reptile skin ever discovered, Mooney notes the newly described specimen is also the oldest amniote skin ever found. Amniotes are the subcategory of animals that encompasses reptiles, birds, and mammals, and the finding offers insight into a key moment in animal biology.

Incredibly, the ~289 million-year-old specimen closely resembles present-day crocodile skin, according to the study. Both living crocodiles and the ancient bit of preserved epidermis have a pebble-like texture and a non-overlapping scale pattern.

Nearly 300 million years ago, “life would have looked very different,” Mooney says. But reptile skin might not have.

DOI:https://doi.org/10.1016/j.cub.2023.12.008

Cover Photo: A visual collage of skin fossils described in the new study. The mummified skin specimen is shown sliced into two pieces in the center-left of the image. The surrounding specimen scans are of fossilized skin impressions. Current Biology, Mooney et al.

Related Articles

An important Gallo-Roman worship complex was discovered near Rennes, France

13 June 2022

13 June 2022

An essential Gallo-Roman worship complex was unearthed by Inrap  (National Institute for Preventive Archaeological Research) archaeologists at Chapelle-des-Fougeretz (Ille-et-Vilaine), near...

Cave paintings discovered in western Turkey carry the region’s past back to prehistory

18 December 2021

18 December 2021

During the archaeological survey carried out in and around the ancient city of Alinda in Aydın province in western Turkey,...

New Archaeological Discoveries may Confirm What is Written in the Bible

22 March 2021

22 March 2021

The importance of what is written in the scriptures in the development of archeology is really great. It is possible...

A Life-Size Funerary High Relief Discovered in Pompeii’s Porta Sarno Necropolis

3 April 2025

3 April 2025

A research project titled “Investigating the Archaeology of Death in Pompeii,” developed by the Universitat de València in collaboration with...

Archaeologists have unearthed an incredible hoard of over 300 Iron Age ‘potins’ in West London

17 July 2021

17 July 2021

Archaeologists at an HS2 construction site in Hillingdon, West London discovered an astonishing treasure of over 300 Iron Age ‘potins”....

4,500-Year-Old Gold Brooch Unearthed in Troy: One of Only Three Known Examples Worldwide

27 September 2025

27 September 2025

Archaeological excavations at the legendary city of Troy have once again made global headlines. In 2025, ongoing digs at the...

3,000-Year-Old Cave Paintings Discovered in Itatiaia National Park in Rio de Janeiro, Brazil

13 April 2025

13 April 2025

In a stunning revelation, a dedicated team of researchers from the National Museum, in collaboration with the Federal University of...

In Cyprus, an important early Christian site has been discovered

12 September 2021

12 September 2021

An important Christian settlement was discovered with mosaics bearing clear inscriptions in Greek during the excavations carried out by the...

Mesolithic stone mace head found during excavation of a site near Buckingham

4 April 2023

4 April 2023

Archaeologists discovered an attractive Mesolithic stone mace head while excavation of a site near Buckingham. The work was done by...

Was Stavanger Cathedral Built on a Viking Settlement?

4 June 2021

4 June 2021

Archaeologists have discovered animal bones and habitation evidence underneath the northern part of Stavanger cathedral that they believe date from...

6,000-year-old island settlement found off the Croatian coast

24 June 2021

24 June 2021

Archaeologist Mate Parica, a professor at the University of Zadar, noticed something unusual while examining satellite images of Croatia‘s coastline....

7,600-year-old child skeleton and a silver ring found in Türkiye’s Domuztepe Mound

12 September 2024

12 September 2024

A child skeleton and a silver ring presumed to be used for babies dating back to 7,600 years ago were...

A Colonnaded Hall with Extraordinary Frescoes of Still Life Found in Pompeii

27 December 2024

27 December 2024

Archaeologists in the famous ancient Roman city of Pompeii, one of the world’s most iconic archaeological sites, have revealed extraordinary...

Women May Have Ruled El Algar in the Bronze Age

12 March 2021

12 March 2021

The diadem found in the Bronze Age tomb belonging to the El Algar culture may have belonged to a queen....

Research Team Identifies Oldest Bone Spear Point In The Americas

3 February 2023

3 February 2023

A team of researchers has identified the Manis bone projectile point as the oldest weapon made of bone ever found...