Trending Now - Ancestors of Complex Life Predate Cambrian by 4 Million Years
WHO:
Live Science - Frankie Dunn, study co-author and researcher at the Oxford University Museum of Natural History.
Live Science - Luke Parry, study co-author and paleobiologist at the University of Oxford.
Live Science - Ross Anderson, study co-author and researcher at the Oxford University Museum of Natural History.
CNN - Jo Wolfe, associate of the department of organismic and evolutionary biology at Harvard University.
WHAT:
Live Science - The fossil collection from the Jiangchuan Biota contains more than 700 specimens, with approximately 200 representing animals, many measuring less than an inch (2.5 centimeters) long.
CNN - Six goblet-shaped specimens resemble a type of Ediacaran animal called Haootia quadriformis, known from fossils in Newfoundland dating to 565 million years ago.
CNN - Researchers excavated 56 fossils of wormlike animals with “holdfast” discs, which were unlike any other ancient animal.
CNN - The site of the Jiangchuan Biota fossil discovery measures approximately 518 square feet (50 square meters), covering roughly the same area as a dozen king-size mattresses.
Live Science - A newly discovered trove of fossils suggests that complex animals evolved at least 4 million years before the Cambrian explosion.
CNN - Researchers excavated approximately 700 fossils from the Jiangchuan Biota fossil site, with about 200 specimens representing animals.
CNN - The fossils include bilateral worm-like animals, early comb jellies, and relatives of starfish and sea cucumbers.
CNN - The fossils demonstrate bilateral symmetry, a trait common in modern animals.
WHERE:
Live Science - The fossils were discovered in southwestern China, specifically at the Jiangchuan Biota fossil site.
CNN - The Jiangchuan Biota fossil site is located in Yunnan province, China.
WHEN:
Live Science - The fossils date back to between 554 million and 539 million years ago.
CNN - The findings were reported on April 2nd, 2026.
CNN - Excavations at the site occurred during multiple visits between 2022 and 2025.
WHY:
CNN - The presence of a preserved, visible gut in the sausage-shaped worm is a rare sight in Ediacaran fossils, as most fossils from this period are impressions of an organism’s body or movement.
Live Science - The discovery indicates that the apparent absence of complex animal groups from other Ediacaran sites may reflect differences in preservation rather than true biological absence.
HOW:
CNN - The fossils were preserved as biofilm, rapidly buried and compressed between layers of rock, leaving behind two-dimensional impressions of their organic tissues, including feeding structures, delicate limbs, and traces of internal organs.
Live Science - The fossils were preserved as carbonaceous films, capturing details of the organisms' soft tissues.
CNN - The fossils were rapidly buried and compressed between layers of rock, leaving behind two-dimensional impressions of their organic tissues.
(UPDATED April 5, 2026 07:17 UTC)
A remarkable fossil collection from the Jiangchuan Biota has been unveiled, featuring over 700 specimens, including around 200 animals, many of which are less than an inch long. Among these discoveries are six goblet-shaped fossils that resemble Haootia quadriformis, an Ediacaran creature known from 565 million-year-old fossils found in Newfoundland, as well as 56 unique wormlike fossils with “holdfast” discs. The preservation of a visible gut in one of the sausage-shaped worms is particularly noteworthy, as it offers a rare glimpse into the anatomy of Ediacaran organisms, which are typically represented only by impressions of their bodies or movements.
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(UPDATED April 5, 2026 05:32 UTC)
Researchers have uncovered a remarkable collection of fossils in southwestern China that suggests complex animals evolved at least 4 million years before the Cambrian explosion, with findings reported on Thursday. Excavations at the Jiangchuan Biota fossil site yielded around 700 fossils, including bilateral worm-like creatures, early comb jellies, and relatives of starfish and sea cucumbers, all dating back to between 554 million and 539 million years ago. This discovery indicates that the lack of complex animal groups in other Ediacaran sites may be due to preservation differences rather than a true absence of these organisms, with the fossils preserved as carbonaceous films that captured intricate details of their soft tissues.