The majority of the bones found at the site are from mammoths. A total of 51 lower jaws and 64 individual mammoth skulls were used to construct the walls of the 30ft by 30ft structure and scattered across its interior. ( PA )
Around 70 of these structures are known to exist in Ukraine and the west Russian Plains.
The bones at one site are more than 20,000 years old, new analysis suggests, making it the oldest such circular structure built by humans discovered in the region.
Researchers said the bones were most likely sourced from animal graveyards, and the circle was then hidden by sediment and is now one foot below current surface level.
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