glacial varve

glacial varve

[¦glā·shəl ′värv]
(geology)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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This layered deposit of sediment is called a varve, and the researchers used glacial varves collected in the 1980s and 1990s for (http://dx.doi.org/10.1038/s41467-017-01273-1) their study , corresponding to a 1,000-year time period between 13,000 and 12,000 years ago. A thicker layer in a varve is an indicator of more melting since a larger volume of water would be needed to carry more debris.
The general nature of the sediments, consisting of typical glacial varves, aquatic organic matter, and infrequent gravity-type deposition indicates sedimentation processes that involved vertical particle settling, ideal for reconstructing lake nutrient histories.