Around 73,000 years ago, the towering predecessor of the Fogo volcano - one of the most active in the world - collapsed. As a result, a unbelievably massive tsunami rippled across the Atlantic Ocean, washing its destructive force over islands that now boast over 250,000 human residents. Experts now wonder if such a disaster is more common than we'd like.
That, as it turns out, is exactly what scientists working off the west African coast in the Cape Verde Islands have found. Several years ago Ricardo Ramalho, a researcher with Columbia University's Lamont-Doherty Earth Observatory, spotted unusual boulders lying as far as 2,000 feet inland and nearly 650 feet above sea level. They were kind of hard to miss -- big as delivery vans and completely out of place, lying on volcanic ground where limestone and basalt boulders do not belong.
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