K. Gronvold et al., ASH LAYERS FROM ICELAND IN THE GREENLAND GRIP ICE CORE CORRELATED WITH OCEANIC AND LAND SEDIMENTS, Earth and planetary science letters, 135(1-4), 1995, pp. 149-155
Four previously known ash layers (Ash Zones I and II, Saksunarvatn and
the Settlement layer) all originating in Iceland, have been identifie
d in the Central Greenland ice core GRIP. This correlation of the ash
between the different environments is achieved by comparison of the ch
emical composition of glass shards from the ash. This establishes and
confirms detailed correlations between the different types of depositi
onal records and the absolute dating of the younger part of the ice co
re by counting annual layers dates the eruptions accurately. A precise
connection with dates obtained by C-14 beyond the range of Th-230-U-2
34 dates from corals. Four additional dendrochronology is established
which provides an excellent confirmation of Icelandic ash layers have
also been identified in the core but not yet correlated with known ash
deposits.