"Under a stone I saw something white. So I started to dig. I hit it a bit. It didn't sound like a stone. When I got it out I saw it was a skull," Aleksander Johansen told Norwegian Broadcasting (NRK).

"The skull is in exceptionally good condition. It's missing some teeth but is otherwise intact," said archeologist Geir Are Johnsen to Norwegian news bureau NTB.

The skull was found near a previous dig which in 1969-1971 uncovered three remnants from the late Stone Age, the oldest being dated to 3,100 B.C.

Johnsen doesn't rule out more intriguing finds being unearthed in the area and was especially pleased that it was an 11-year-old on a school outing that found the skull.

"It is hardly an everyday occurrence that you find a nearly intact skull that could be so ancient," Johnsen said.