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Varved sediments of glacial Lake Hitchcock in an abandoned brickyard in Willimansett, Massachusetts. Each varve represents 1 year of lake-bottom deposition consisting of a summer layer of silt and sand and a winter layer of clay. One hundred and thirty varves are exposed at this site. See page 48. [K. L. Verosub, University of California, Davis]


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