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Ham Lake fire reveals geological treasure

Geologists who had their plans for an annual meeting changed by the Ham Lake fire in northern Minnesota in May stumbled upon a previously undiscovered rock that may hold secrets dating back 1.85 billion years, the Star Tribune reported Sunday. The formation resembles cement, but, as Mark Jirsa, the geologist who discovered the formation explains, this cement was made from an ancient impact with force equal to several billion Hiroshima-sized nuclear bombs. This formation is the furthest above ground evidence of the impact found.