2 July 2025 The Future is the Product of the Past

Paleonursery offers a detailed glimpse at life 518 million years ago

Fossilized specimens of thousands of undersea animals buried under a sedimentary avalanche 518 million years ago have been found near Kunming, China, many of which are of new species.

Paleontologists who found the fossil trove believe they’ve unearthed a Cambrian-era ‘paleonursery,’ according to their report in the journal Nature Ecology and Evolution, with more than half of the specimens juveniles.

The Haiyan lagerstätte—from the German for storage place,’ it refers to a sedimentary deposit with exceptionally well-preserved fossils—contains approximately 2,800 specimens from at least 118 species, including predecessors to modern-day insects, worms, crabs, jellyfish, sponges, and trilobites.

There were also specimens with preserved eggs, larvae, and appendages intact and the inner soft tissues still visible.

Of the species found, 17 were previously unknown species.

Fossil of a juvenile arthropod, Isoxys auritus, preserving the eyes and internal soft tissues. IMAGE: XIANFENG YANG, YUNNAN KEY LABORATORY FOR PALAEOBIOLOGY, YUNNAN UNIVERSITY
Fossil of a juvenile arthropod, Isoxys auritus, preserving the eyes and internal soft tissues. IMAGE: XIANFENG YANG, YUNNAN KEY LABORATORY FOR PALAEOBIOLOGY, YUNNAN UNIVERSITY

“It’s just amazing to see all these juveniles in the fossil record,” said Julien Kimmig, collections manager at the Earth and Mineral Sciences Museum & Art Gallery, Penn State. “Juvenile fossils are something we hardly see, especially from soft-bodied invertebrates.”

The Cambrian Period, which lasted 541 million to 485 million years ago, witnessed unprecedented climatic and biological changes, including the Cambrian explosion—the planet’s fastest and most extensive diversity of life in history.

There is a comprehensive fossil record from that time period when life existed solely in the water, but little of it depicts juvenile animals.

According to the researchers, each sediment layer in the lagerstätte represents a distinct ‘burial event,’ and while more recent strata have yielded some results, none equal the richness of the lowest level. It is unknown what triggered the burial event that wiped out the specimens at that level.

According to the team, it might have been caused by a fast change in oxygen levels or a storm that caused thick sludge to ‘wash down a hill and bury everything in its path.’

It may have killed them, but it preserved them so well that they are exposing bodily parts never seen before, including entire three-dimensional eyes.

According to the researchers, scientists may utilize CT scanning on these 3D characteristics to rebuild the fossils and extract even more information from the remains.

Scientists will be able to use this collection to study how these ancient animals developed from the larval to the adult stage.

Fossil of a juvenile arthropod, Leanchoilia illecebrosa, showing fine anatomical details of the appendages and preserving the gut tract. IMAGE: XIANFENG YANG, YUNNAN KEY LABORATORY FOR PALAEOBIOLOGY, YUNNAN UNIVERSITY
Fossil of a juvenile arthropod, Leanchoilia illecebrosa, showing fine anatomical details of the appendages and preserving the gut tract. IMAGE: XIANFENG YANG, YUNNAN KEY LABORATORY FOR PALAEOBIOLOGY, YUNNAN UNIVERSITY

“We’ll see how different body parts grew over time, which is something we currently do not know for most of these groups,” Julien Kimmig said. “And these fossils will give us more information on their relationships to modern animals. We will see if how these animals develop today is similar to how they developed 500 million years ago, or if something has changed throughout time.”

The fossils will also allow researchers to analyze how animals acted 500 million years ago, when the planet was somewhat warmer than it is today, and use it as a proxy for where the world is heading in terms of animal behavior in a warmer climate.

“In this deposit, we found the ancestors to most modern animals, both marine and terrestrial,” Julien Kimmig said. “If the Haiyan Lagerstätte is actually a paleonursery, it means that this type of animal behavior has not changed much in 518 million years.”

Xianfeng Yang, a paleobiologist at Yunnan University, China, led a team of Chinese researchers that collected the fossils at the research site. Additional contributors to this study include Dayou Zhai and Yu Liu, Yunnan University; and Shanchi Peng, Chinese Academy of Sciences.

This research was supported by the National Natural Science Foundation of China, the State Key Laboratory of Palaeobiology and Stratigraphy at the Nanjing Institute of Geology and Palaeontology, and the Key Research Program of the Institute of Geology & Geophysics, Chinese Academy of Sciences.

PENN STATE

Related Articles

Fossil found at the edge of the Tibetan Plateau reveals an owl active during the day 6 million years ago

29 March 2022

29 March 2022

The incredibly well-preserved fossil skeleton of an extinct owl that lived was discovered on the edge of the Tibetan Plateau,...

‘Holy Grail of shipwrecks’ worth $20 billion in treasure to be raised from seabed

10 November 2023

10 November 2023

A treasure ship described as the “holy grail of shipwrecks” will reportedly be lifted from the sea floor where it...

Hunter-Gatherers Kept an ‘Orderly Home’ in the Earliest Known British Dwelling

25 July 2024

25 July 2024

Based on archaeological evidence from a Yorkshire site, new research suggests that hunter-gatherers probably kept an organized home with designated...

Anthropologists discovered a bone in the Grotte du Renne cave in France that could indicate the presence of a previously unknown lineage of Homo sapiens

9 August 2023

9 August 2023

A bone discovered in the Grotte du Renne cave in France may represent the existence of a previously unknown lineage...

Archaeologists have uncovered oldest Roman forum in Hispania, at the site of a named unknown city

3 September 2023

3 September 2023

Archaeologists have uncovered an ancient Roman forum from more than 2,000 years ago at the site of an unknown city...

World’s Oldest Place Name Signs

4 February 2021

4 February 2021

Throughout the history of the world, our interest and curiosity in ancient cultures and lives continue to increase day by...

2,500-Year-Old Tombs Uncovered Of Unknown Persons With Gold Tongues in Egypt

6 December 2021

6 December 2021

The remains of two unknown persons with golden tongues were found inside tombs, dating back to the Saite Dynasty (664...

Roman Era Mosaic Unearthed in Illegal Excavation Near Zile Castle

13 May 2025

13 May 2025

A stunning mosaic has been unearthed during an illegal excavation near Zile Castle, located in the Tokat province of Türkiye,...

Archaeologists discover the Americas’ oldest adobe architecture

7 December 2021

7 December 2021

On the north coast of Peru, researchers have discovered the oldest adobe architecture in the Americas, constructed with ancient mud...

Horse cemetery in Westminster revealed as likely resting place for elite imported animals

25 March 2024

25 March 2024

Archaeological analysis of a medieval horse cemetery discovered in London nearly 30 years ago has revealed the international scale of...

Interesting Social Dimensions of Rare Diseases Seen in the Bronze Age

10 March 2021

10 March 2021

When it comes to Rare Diseases, what almost all of us think of is that this disease has affected very...

Ancient Christian Settlement Discovered in Egypt

14 March 2021

14 March 2021

The Egyptian Ministry of Antiquities said on Saturday that a French-Norwegian archaeological team had discovered a new ancient Christian settlement...

7,000-year-old discovery in Umm Jirsan Cave

28 June 2021

28 June 2021

Archaeologists have made new discoveries in the Umm Jirsan cave in the Harrat Khaybar lava field in northern Saudi Arabia....

5,500-year-old Menhir discovered in Portugal

28 August 2023

28 August 2023

A 5,500-year-old (that is around 3500 BC) menhir has been discovered in the town of São Brás de Alportel in...

In Turkey’s Zerzevan Castle, a badge bearing the US national symbol was discovered

4 October 2021

4 October 2021

Recent investigations have led to the discovery of a badge bearing the pattern of the Great Seal of the United...