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Published online 20 October 2009 | Nature | doi:10.1038/news.2009.1022

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Darwin's geological mystery solved

Origin of odd South American boulders may have defeated the Origin's author.

In June 1833, Charles Darwin asked the captain of the HMS Beagle to delay his departure from Tierra del Fuego so that he could study a strange group of granite boulders he had found on the coast at Bahía San Sebastián.

"[O]ne of these, shaped somewhat like a barn, was forty-seven feet in circumference and projected five feet above the sand beach," he later wrote.

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