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Science 22 August 1969:
Vol. 165. no. 3895, pp. 795 - 797
DOI: 10.1126/science.165.3895.795
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Articles

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

Arthur S. Knox 1

1 U.S. Geological Survey, Washington, D.C. 20242

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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Science. ISSN 0036-8075 (print), 1095-9203 (online)