567 million years ago, strange soft-bodied animals began moving across the deep seafloor in what is now Canada, with Dickinsonia feeding through its underside despite having no mouth, pushing animal movement millions of years earlier

A remarkable fossil discovery in the remote Mackenzie Mountains of Canada’s Northwest Territories is rewriting part of the story of early animal evolution. Researchers have identified more than 100 fossils from rocks dating to approximately 567 million years ago, including organisms that appear to have moved across an ancient deep seafloor. The fossils belong to the Ediacaran period, an era when life looked dramatically different from the animals familiar today. The discovery is significant because the Canadian specimens are estimated to be 5 million to 10 million years older than comparable examples of several important Ediacaran organisms, suggesting that behaviors and body plans associated with active animal life emerged earlier than previously recognized.

The fossils provide an unusually valuable glimpse into a time when most large organisms were soft-bodied and left behind no shells, bones or other durable skeletons. Their preservation therefore depended on exceptional geological circumstances in which an organism’s body or activity could be rapidly buried and recorded in sediment. The Canadian site contains more than 100 specimens and includes six groups of organisms not previously documented in North America.

Ediacaran Life Evidence


Researchers say the community expands the known geographic and environmental range of Ediacaran life and offers evidence that complex organisms were inhabiting deep offshore environments. The discovery is especially important because much of the previous understanding of these communities came from better-known fossil deposits elsewhere in the world.

Among the most fascinating organisms found at the site is Dickinsonia, a flat, segmented creature that bears little resemblance to any modern animal at first glance. Yet its fossil record contains evidence suggesting that it could move across the seafloor. Even more surprising, Dickinsonia appears to have lacked a conventional mouth and digestive tract.

Instead, researchers have proposed that it fed through its lower surface, interacting directly with the microbial mats covering the ancient seafloor. Earlier research has interpreted chains of feeding traces as evidence that Dickinsonia moved from one feeding location to another, digesting organic material through its underside. This unusual feeding strategy shows how different the earliest animal ecosystems could be from modern ones.

Dickinsonia

The idea of a mouthless animal moving while feeding through its underside may sound strange, but it reveals why Ediacaran fossils are so important to evolutionary science. Dickinsonia was not simply a stationary object lying on the seabed. Evidence interpreted as feeding and locomotion suggests interaction with the microbial landscape beneath it.

Some studies have proposed that movement occurred through muscular or coordinated body contractions, allowing the organism to glide across the microbial mat. The fossil traces are therefore valuable because they preserve behavior as well as body shape. Scientists can learn not only what these organisms looked like but also how they may have interacted with their surroundings.

Another important discovery from the Canadian fossils is Kimberella, an organism associated with early active movement and a more recognizable body organization. Kimberella is often interpreted as an early relative of mollusks and is notable for having a muscular foot and feeding structures adapted to scraping material from the seafloor.

New Fossils Details

The new fossils therefore add to evidence that active movement and more complex animal body plans were already emerging during the Ediacaran. The significance extends beyond one unusual creature because bilaterally organized animals eventually became enormously diverse, giving rise to many of the major animal groups living today. Finding evidence of these fundamental characteristics deeper in geological time can help researchers reconstruct when important evolutionary innovations appeared.

The fossil assemblage also includes Funisia, a stationary, tube-shaped organism found living in clusters. Researchers interpret these clustered fossils as evidence of an early form of sexual reproduction, potentially involving coordinated release of reproductive cells into seawater. If that interpretation holds, the fossils offer an extraordinarily old glimpse into reproductive behavior. Together with the evidence for movement from organisms such as Dickinsonia and Kimberella, the Canadian site suggests that the Ediacaran seafloor was not simply populated by passive organisms. Instead, it contained creatures with different lifestyles, feeding strategies and reproductive behaviors.

Perhaps equally surprising is the deep-water setting in which these fossils were found. Ediacaran communities are often associated with relatively shallow marine environments, but the Canadian specimens came from rocks representing an ancient continental-slope environment. That raises important questions about where early animal innovations actually originated. It is possible that deep marine environments provided stable conditions in which some early organisms could develop and diversify before appearing in other habitats. The discovery does not establish that all early animals originated in the deep ocean, but it expands the range of environments scientists must consider when investigating the beginnings of complex animal life.

Remote Fossil Site

The discovery ultimately demonstrates how a remote fossil site can transform our understanding of evolution. The Canadian mountains preserve evidence from a period when animals were experimenting with body forms and ecological strategies long before the familiar diversity of later geological eras appeared.

Dickinsonia’s apparent ability to move and feed through its underside is particularly striking because it shows that active behavior could exist in organisms lacking many anatomical features associated with modern animals. There are also scientific debates surrounding how some Ediacaran trace fossils should be interpreted, reminding us that ancient behavior must be reconstructed carefully from incomplete evidence.

Yet the broader significance remains compelling: 567 million years ago, the seafloor was already home to strange organisms capable of interacting with their environment in surprisingly sophisticated ways. These fossils push the story of animal movement deeper into Earth's past and provide another extraordinary chapter in the long evolutionary journey that eventually produced the animal world we know today.