The findings, to be broadcast in a documentary on BBC One, shows that Stonehenge wasn't just abandoned by Mesolithic humans and occupied by Neolithic people thousands of years later. On the contrary, it represents a place where one culture mingled with the other.
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Jacques started to survey the area after seeing aerial photographs of the site in 1999 as a student.
He noticed it contained a natural spring, which would have attracted animals.
"What we found was the nearest secure watering hole for animals and people, a type of all year round fresh water source," Jacques told the BBC.
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"My thinking was where you find wild animals, you tend to find people, certainly hunter gatherer groups coming afterwards," he added.
According to Peter Rowley-Conwy, professor of archaeology at Durham University, the finding is significant.
"The site has the potential to become one of the most important Mesolithic sites in northwestern Europe," Rowley-Conwy said.