Understanding sinkholes and karst - British Geological Survey
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Northern Michigan From Above: Alpena County Sinkholes
Northern Michigan From Above: Alpena County Sinkholes
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POV: You discovered Michigan has over 200 sinkholes in the Northern Lower Peninsula!🌲🕳️ 🪨These wild karst preserves near Alpena—like Bruski Sink, Stevens Twin Sinks, and Mystery Valley—are part of a rare geological area of limestone and shale on top of a layer of easily dissolved minerals like gypsum. 🍃Over time, the gypsum eroded away and limestone & shale collapsed inward forming the sinkholes. 📍Posen, Michigan 🎒Great for curious hikers nature nerds (like us!) 🕳️ Some trails lead right
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