The Discovery
While ancient ocean fish are well understood, freshwater species have long been difficult to study because paleontologists usually find only scattered individual bones. A site in central Alberta known as Pisces Point has offered a rare breakthrough by yielding intact fossilized fish skeletons from the Cretaceous period, 66 million years ago near the end of the age of dinosaurs. These rare specimens are extremely tiny—measuring just a few centimeters in length—and are buried inside black rock, making their fine details impossible to examine with the naked eye.
What Scientists Found
To peer inside the dark stones, researchers used ultrabright synchrotron light at the Canadian Light Source, based at the University of Saskatchewan. This advanced imaging allowed the team to analyze internal anatomical structures and digitally isolate specific parts, such as jaws, to compare them against isolated bone finds.
The investigation centered on spiny-rayed fish known as acanthomorphs, a massive group that accounts for about one-third of all living vertebrates today, including modern marine tuna and freshwater perch. The researchers identified two major evolutionary milestones:
- A polymixiiform fossil was identified, proving that a group currently restricted to the deep ocean originally lived in fresh water during the Cretaceous period.
- A percomorph specimen was analyzed, providing the earliest documented evidence of this group in the Cretaceous period.
Why It Matters
Because isolated freshwater jawbones make classification challenging, finding complete articulated skeletons provides crucial taxonomic clarity. Researchers from the Royal Tyrrell Museum, the University of Alberta, and Western University used these specimens to fill gaps regarding ancient North American freshwater environments. Detailed in the Canadian Journal of Zoology, the research sheds light on prehistoric biodiversity and reveals key evolutionary steps that connected ancient fish to their living descendants.
Source: dinosaur fossil discovery - BingNews · Published October 30, 2026 · Photo by P Mantha on Unsplash
