Glacial Age Marsh, Lafayette Park, Washington, D.C

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Science  22 Aug 1969:
Vol. 165, Issue 3895, pp. 795-797
DOI: 10.1126/science.165.3895.795


Organic sediments beneath historic Lafayette Park mark the site of a freshwater marsh which bordered the Potomac River when it was 15 meters above its present level. Plant microfossils and ice-rafted boulders indicate a climate much colder than now. The carbon-14 age of more than 45,000 years and palynological studies suggest an early Wisconsin age.

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