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Dr. Harald Biester and students Oscar Baeza and Sascha Birkenstock push a sharpened sleeve into a bog at the foot of the Gran Campo Nevado ice field to remove a core from its 10,000-year-old peat. The region's many bogs trap pollens and chemicals dispersed through the air and water. Peat cores take scientists back thousands of years with each foot of depth.
Dr. Harald Biester and students Oscar Baeza and Sascha Birkenstock push a sharpened sleeve into a bog at the foot of the Gran Campo Nevado ice field to remove a core from its 10,000-year-old peat. The region's many bogs trap pollens and chemicals dispersed through the air and water. Peat cores take scientists back thousands of years with each foot of depth.