A remarkably rich fossil site uncovered in Canada’s remote Northwest Territories is giving scientists one of their clearest views yet of Earth’s earliest complex animals. It suggests that key evolutionary milestones appeared millions of years earlier than previously believed.
The fossils belong to the Ediacaran biota, a collection of mostly soft-bodied organisms that lived on ancient seafloors before animals evolved shells or bones. Some of the newly discovered specimens are about 567 million years old, making them 5 million to 10 million years older than any previously known fossils from the White Sea assemblage.
The finding suggests that animal movement and sexual reproduction began earlier than previously indicated by fossil evidence. The study, led by researchers from the American Museum of Natural History and Dartmouth, was published in the journal Science Advances.
“For 3 billion years, life on Earth was dominated by microbes,” said lead author Scott Evans, assistant curator of invertebrate paleontology at the American Museum of Natural History. He further explained that quite suddenly, strange marine animals appeared.
They were large enough to see with the naked eye and capable of behaviors that seem familiar today. This newly discovered fossil site offers an exceptional opportunity to understand that major transition, when life first became large, complex, and unmistakably animal.
Rare fossils reveal a lost world
The Ediacaran Period marked the first appearance of large, multicellular organisms. Many had unfamiliar body shapes, including flat discs, leaf-like forms and ribbed oval bodies. While some species have been linked to modern groups such as mollusks, comb jellies and jellyfish relatives, others have no living counterparts.
Because these organisms lacked hard body parts, their remains rarely fossilized. Fossil sites preserving a wide variety of Ediacaran species are exceptionally rare, making the Canadian discovery especially important.
A remarkable fossil site in Canada's Northwest Territories is rewriting the story of animal evolution. The 567-million-year-old fossils suggest animals began moving and reproducing sexually 5–10 million years earlier than once thought. pic.twitter.com/B83BVLW5e9
— Tom Marvolo Riddle (@tom_riddle2025) August 7, 2026
Researchers classify Ediacaran fossils into three major assemblages based on age: Avalon, White Sea and Nama. Until now, White Sea assemblage fossils had been found only in Europe, Asia and Australia. The newly discovered fossils from the Mackenzie Mountains mark the first known White Sea assemblage in North America.
Researchers documented more than 100 fossils, including six groups never before recorded on the continent. The work was carried out with the guidance and permission of the Sahtú Dene and Métis communities, whose traditional lands include the fossil site.
Ancient species offer new evolutionary clues
The fossils are also among the oldest known examples of the White Sea assemblage, dating to about 567 million years ago. Their age places them alongside the older Avalon assemblage and raises new questions about when these early animal communities first appeared.
Among the most important discoveries is Dickinsonia, a flat organism that moved across the seafloor while absorbing nutrients directly through its underside.
Researchers also identified Funisia, which provides the oldest known fossil evidence of sexual reproduction, and Kimberella, an early relative of modern mollusks that may represent the oldest known bilaterian, the group of animals with symmetrical left and right sides that includes more than 99% of living animal species.
Another remarkable find is Eoandromeda, a possible early comb jelly with eight spiral-shaped arms. “Not only is this new site highly diverse, but also it is from a part of the rock succession where we have previously lacked fossil remains,” said study co-author Justin Strauss, an associate professor of Earth and Planetary Sciences at Dartmouth.
“Given our understanding of the regional geology in northwestern Canada, there is great potential here to revisit our understanding of Ediacaran Earth history.”
Deep oceans may have nurtured the first animals
The fossils indicate that these organisms lived in deeper offshore waters than researchers had previously associated with the White Sea assemblage. The finding supports a growing theory that some of the earliest animals evolved in stable deep-sea environments before gradually spreading into shallower coastal waters.
“These results suggest a pattern where evolutionary innovation begins in deeper environments and later spreads toward the coast,” Evans said. “We think of the deep ocean as a dark, inhospitable place, but it is also relatively stable, with few fluctuations in things like temperature and oxygen essential to most animal life. This stability may have provided key opportunities to support early animal life.”
More discoveries may still lie underground
Researchers believe the discovery represents only a fraction of what the site may contain. The fossil-bearing layers are buried beneath hundreds of feet of additional rock that could preserve many more specimens, offering new opportunities to study one of the most important periods in the evolution of life on Earth.
The fossils will eventually become part of the permanent collection at the Prince of Wales Northern Heritage Centre in Yellowknife, ensuring that future research can continue to uncover new insights into the origins of complex animal life.
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