Solved: Mystery of Moroccan Village Built on Boulders
Formation appeared 4.5K years ago after rockfall: study
By Matt Cantor, Newser User
Posted Apr 19, 2014 1:20 PM CDT
A view of ruins in the Atlas Mountains.   (Shutterstock)

(Newser) – In the High Atlas Mountains, a tiny Moroccan village called Arroumd sits on a pile of boulders whose origins, until now, were a mystery. Turns out those boulders came from a rockfall 4,500 years ago, a new study finds. Previous theories had indicated they could have been deposited by glaciers or perhaps have fallen shortly after a local glacier melted, LiveScience reports. But neither of those was the case, a team of researchers now finds.

By assessing levels of an isotope known as beryllium-10 in the rocks, they were able to pinpoint the age of the deposit—which occurred long after the melting of the glacier some 11,700 years ago, says researcher Philip Hughes. "The cliff did not collapse until 4,500 years ago. The rock avalanche was therefore not triggered by glacier retreat," he notes. The real cause may have been seismic activity, his team says; there's a tectonic fault nearby. (A similarly cool recent discovery: Scientists have pinpointed the source of Stonehenge's rocks.)

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Showing 3 of 5 comments
Apr 23, 2014 11:20 AM CDT
Hmm, now where can we send the Team who discovered this oh so interesting fact, without which Humanity may have become extinct!
Crazy Horse
Apr 21, 2014 1:34 PM CDT
Were the boulders arrange in such a way to suggest that a lost high-tech civilization or perhaps ancient aliens placed them there? I actually believe in the antediluvian high-tech civilization theory... I'm just wondering if it applies here.
Apr 20, 2014 10:50 AM CDT
? We built this city...we built this city on a pile of boulders ?