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A map of the upper portion of New York showing glacial fill types: 1, Ordovician; 2-5, Silurian; 6-13, Devonian; 14, Mississippian.
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A map of the upper portion of New York showing glacial fill types: 1, Ordovician; 2-5, Silurian; 6-13, Devonian; 14, Mississippian.