Researchers Discovered Fossilized Plesiosaur Pellets
Scientists identified over 20 fossilized food masses from marine reptiles dating back to the Jurassic period.
Updated on Oct. 8, 2026 in Geology
Researchers discovered more than 20 fossilized masses of regurgitated food from ancient marine reptiles known as plesiosaurs. These remains, found in rock cores beneath the North Sea, provide new insights into the feeding habits of the creatures during the Middle to Upper Jurassic.
Why it matters
The fossils clarify how these predators managed digestion, as their teeth were ill-suited for processing hard skeletal materials. By expelling indigestible remains, these animals were able to feed on diverse seafloor prey despite their dental limitations.
The discovery involved 20 fossilized masses recovered from deposits 50 kilometres off the coast of modern Norway. Cryptoclidid plesiosaurs, which ranged from four to eight metres in length, inhabited these waters from the Middle Jurassic to the Early Cretaceous.
The players
Cryptoclidid plesiosaurs
These marine reptiles were aquatic predators that lived from the Middle Jurassic through the Early Cretaceous and reached lengths of up to eight metres.
The details
The fossils reveal that cryptoclidid plesiosaurs consumed shellfish, bivalves, cephalopods, and tubular worms by angling their necks toward the seafloor. These items were then consolidated in the stomach before being expelled as compact, regurgitated pellets.
Timeline
The deposits formed during the Middle to Upper Jurassic era.
Cryptoclidid plesiosaurs existed over a 140 million year span from the Jurassic to the Cretaceous.
The Big Picture
This finding shifts the scientific understanding of plesiosaur feeding ecology, moving away from simple dental analysis toward a more complex model of dietary processing. It bridges gaps between marine geology and vertebrate paleontology by linking sedimentology with behavioral biology.
The study suggests that future analysis of marine sediment cores could provide more comprehensive data on extinct predator populations. This research helps paleontologists reconstruct ancient ecosystems with greater precision, potentially informing future discoveries in similar offshore deposits.
The takeaway
These findings demonstrate that ancient marine life occupied complex ecological niches that required specialized digestive adaptations. Researchers can use these fossils to better understand how species managed resource consumption in high-competition prehistoric environments.
Further reading
For more information on ancient earth processes, explore the Geology section.
