A remote outcrop in Canada’s Northwest Territories has yielded more than 100 fossils dated to roughly 567 million years old, adding a rare, well-preserved snapshot to the record of the earliest known animal communities on Earth. The site, described in a new paper in Science Advances, was surveyed by a team led by Scott Evans, Assistant Curator of Invertebrate Paleontology at the American Museum of Natural History, working with colleagues from Stanford University, Pennsylvania State University and Dartmouth College.
The fossils come from the Ediacaran Period, the interval directly preceding the Cambrian explosion, when the first complex, multicellular animal life appears in the rock record after roughly 3 billion years in which Earth’s biosphere was dominated by microbes. “For 3 billion years, life on Earth was dominated by microbes,” Evans said. “Then, all the sudden, we get these strange-looking marine animals.” The new site, located in the Mackenzie Mountains on the traditional lands of the Sahtú Dene and Métis, extends the documented range of that transition and, according to the researchers, pushes back key milestones in the emergence of animal life by five to ten million years.
What the fossils show
Among the more than 100 specimens recovered, the team identified Dickinsonia, Kimberella, Funisia and Eoandromeda — a mix of body fossils and trace fossils characteristic of the Ediacaran biota, a group of soft-bodied organisms whose relationship to later animal lineages is still actively studied. Dickinsonia, a flattened, ribbed organism with no clear head, limbs or gut, is one of the most recognizable Ediacaran fossils and remains debated as either an early animal or a more distant branch of multicellular life. Kimberella, by contrast, is widely interpreted as a bilaterally symmetrical animal that left feeding traces on the sediment surface, evidence used to argue for the early presence of mobile, gut-bearing organisms well before the Cambrian.
Funisia and the oldest evidence of sexual reproduction
The find the researchers highlight as most significant is Funisia, a tube-shaped, sponge- or cnidarian-like organism. Populations of Funisia at the site show size and clustering patterns consistent with colonial, sequential growth from settled larvae — a pattern that has previously been interpreted as the oldest known fossil evidence of sexual reproduction in the animal fossil record. Sexual reproduction is a foundational trait for how animal lineages diversify and disperse, so pinning down when and where it first appears in the fossil record is directly relevant to reconstructing how quickly, and by what mechanisms, early animal diversity expanded going into the Cambrian.
A multi-institution, multi-funder effort
The project is also a clean example of how earth-science and astrobiology funding streams intersect on a single piece of fieldwork. According to the published acknowledgments, the work was supported by a NASA Exobiology grant (award #80NSSC25K7024) together with three National Science Foundation earth-science awards: an NSF grant (#EAR-2021431) and two NSF Frontier Research in Earth Science grants (#EAR-2021324 and #EAR-2021176). NASA’s Exobiology program funds research into the origin, evolution and distribution of life, including deep-time analogues on Earth that inform how life might be recognized elsewhere; NSF’s Frontier Research in Earth Sciences program funds foundational earth-science questions, in this case the sedimentary and paleontological fieldwork needed to locate, date and interpret a new Ediacaran assemblage. Four co-investigating institutions — the American Museum of Natural History, Stanford University, Pennsylvania State University and Dartmouth College — combined fieldwork, geochronology and paleontological analysis to document the site.
Why the site matters
Well-preserved Ediacaran assemblages are rare, and each new one refines the timeline paleontologists use to place milestones such as the first evidence of animal mobility, predation, or reproduction. By recovering more than 100 fossils spanning several previously documented Ediacaran taxa at a single, precisely dated Canadian locality, the team adds a data point that shifts some of those milestones several million years earlier than the existing record suggested — a reminder that the picture of when, where and how the first animals arose is still actively being filled in, fossil bed by fossil bed.
Source: ScienceDaily, “Canadian fossil site pushes back dawn of animal life,” based on Evans, S.D. et al. (2026), “New Ediacaran fossil assemblage from the Northwest Territories, Canada,” Science Advances 12(21), DOI: 10.1126/sciadv.aed9916.
