20,000-Year-Old Spruce Forest Discovered

A recent geologic mapping project revealed evidence of past climate conditions and vegetation existing approximately 20,000 years ago when a large continental ice sheet advanced into southeastern Indiana. An exposure of glacial sediments indicate that the ice sheet advanced over a small pond or wetland near a meltwater stream. These sediments contain fragments of spruce trees, including logs with bark still intact, suggesting climate conditions similar to that of the modern-day boreal forest of Canada. Radiocarbon dating and a new technique called optically stimulated luminescence dating was used to determine the age of the organic material and sediments.
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Michael Daniels
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