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The use of microtephra horizons to correlate Late‐glacial lake sediment successions in Scotland
Author(s) -
Turney Chris S. M.,
Harkness Douglas D.,
Lowe J. John
Publication year - 1997
Publication title -
journal of quaternary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.142
H-Index - 94
eISSN - 1099-1417
pISSN - 0267-8179
DOI - 10.1002/(sici)1099-1417(199711/12)12:6<525::aid-jqs347>3.0.co;2-m
Subject(s) - tephra , stadial , geology , younger dryas , glacial period , tephrochronology , horizon , allerød oscillation , radiocarbon dating , sediment , geochemistry , geomorphology , paleontology , volcano , physics , astronomy
Evidence is presented to show that two measurable concentrations of microtephra particles can be detected in deposits of Late Devensian Late‐glacial age in three sites in Scotland. One layer is attributed to the Vedde Ash, a marker horizon within the Younger Dryas chronozone. The second is a new tephra reported for the first time, which we name the Borrobol Tephra. This occurs consistently near the base of the Late‐glacial Interstadial organic sediments at each site, and is thought to date to around 12.5 14 C ka BP. Geochemical determinations using an electron microprobe confirm the identification of the Vedde Ash, suggest the Borrobol Tephra to have an Icelandic origin, and demonstrate the consistency of the geochemical signals at all three sites. © 1997 John Wiley & Sons, Ltd.