The finding that caught archaeologists off guard Some 25,000 years ago, hundreds of mammoth skeletons made up the mysterious circle

Around 25,000 years ago, hunter-gatherers used the bones from 60 mammoths to build a large circular structure in Russia.

And no one knows why.

Researchers have excavated the site in an attempt to understand it, but they don’t know why the structure was built, according to a new study.

The discovery that surprised archaeologists "The strange circle is made up of hundreds of mammoth skeletons" About 25,000 years ago

This isn’t the first “mammoth house” to be found in Russia, but it is the oldest and largest, measuring 41 feet across.

In the 1960s and ’70s, researchers found similar, smaller buildings at the site, which they dubbed Kostenki 11. It’s 310 miles south of Moscow and now home to a museum, the State Archaeological Museum-Reserve Kostenki.

In 2014, researchers found evidence of this structure at the site and began excavation in 2015, which took three years. A study detailing their findings published this week in the journal Antiquity.

The discovery that surprised archaeologists "The strange circle is made up of hundreds of mammoth skeletons" About 25,000 years ago

These mammoth bone structures, dating to the Ice Age, have been found across Eastern Europe. But until now, the oldest ones found were dated to 22,000 years ago.

Based on previous discoveries, researchers believe they were constructed by Palaeolithic people to serve as houses, providing refuge during harsh winters. Ice Age winters likely had lows reaching negative four degrees Fahrenheit.

And constructing something this massive out of hundreds of mammoth bones would have taken time. It’s surprising, considering that populations of hunter-gatherers never spent much time in one location.

The discovery that surprised archaeologists "The strange circle is made up of hundreds of mammoth skeletons" About 25,000 years ago

“Mammoth bones are very heavy, and building the circular structure represents a huge investment of time and energy by the humans that built this,” said Alexander Pryor, lead study author and Palaeolithic archaeologist at the University of Exeter.

The bones formed a continuous circle, with no obvious entrance, according to the study. So far, the researchers have identified 51 mammoth mandibles and 64 skulls, the researchers said.

The discovery that surprised archaeologists "The strange circle is made up of hundreds of mammoth skeletons" About 25,000 years ago

The wealth of bones used to construct the site are visible during excavation.

Alex Pryor

Inside the circle, the researchers also found the first evidence that wood was burned inside it. But overall, there are no signs of long-term habitation inside the structure.

The researchers believe that it didn’t act as a wintertime refuge, which has them rethinking the purpose of these massive, time-consuming structures.

“It clearly meant something to them, and there was very likely a ritual element to it, even if the structure ultimately had some sort of practical purpose too,” Pryor said.

Investigating a mammoth house

As the first “mammoth house” found in more than 40 years at Kostenki, the researchers took advantage of new techniques to investigate the site that weren’t available for the structures previously found nearby.

This included flotation, something fairly new when the other structures were excavated. Archaeologists use flotation to separate material from soil, using water and sieves. This allows for the discovery of tiny fragments, which can provide the minute details of a larger story.

Flotation helped the archaeologists find evidence of a possible food source for the hunter-gatherers at the site – besides the mammoths.

The discovery that surprised archaeologists "The strange circle is made up of hundreds of mammoth skeletons" About 25,000 years ago

The mammoth bones once acted as walls. Now, they are spread across the interior of the site found in the Russian plains.

Alex Pryor

“We found pieces of soft plant tissue typically found in edible roots or tubers, hinting at a plant food component in peoples’ diet,” Pryor said. “These finds are important because they illustrate how our human ancestors adapted to survive the harsh environments of the last Ice Age by making use of the resources they found around them.”

The discovery that surprised archaeologists "The strange circle is made up of hundreds of mammoth skeletons" About 25,000 years ago

It was also flotation that revealed the tiny bits of charred wood, the first evidence that humans burned wood fires in the mammoth structure. And it suggests that wood was still a resource used by hunter-gatherers during the Ice Age.

Other areas in Northern Europe showed signs of abandonment at the time, and suggest that trees were a rare and precious resource. This may hint at why Kostenki was chosen

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