title: Glacial age marsh, lafayette park, washington, d.C.
abstract: 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.
authors.forename: A S
authors.initials: AS
authors.lastname: Knox