Extending the known distribution of the Younger Dryas Vedde Ash into northwestern Russia

The known distribution of wind-blown Vedde Ash (ca. 10.3 ka BP) has been ex tended to the Karelian Isthmus in northwestern Russia. This has been possib le as the result of a density separation technique that separates the rhyol itic Vedde Ash shards from the minerogenic host sediment. The Vedde Ash occ urs in the middle of a pollen zone with high percentages of, for example, A rtemisia and Chenopodiaceae, suggesting that the Younger Dryas (or GS-I in the GRIP ice-core event stratigraphy) was cold and dry throughout its durat ion. This is in agreement with sites in south Sweden where the Vedde Ash al so occurs in the middle of a pollen zone dominated by Artemisia, Chenopodia ceae and Cyperaceae. Copyright (C) 2000 John Wiley & Sons, Ltd.