Fróðskaparrit - 01.01.1998, Page 331

ÍSLENDSK TEFRA í SEINGLASIALUM ÁLØGUM í SKOTLANDI (14-9,000‘^C BP)
337
most cases a ‘tail’ is observed in sediments
directly above the peak consistent with de-
position of reworked material within the
catchment. Multiple tephra peaks generally
reflect post depositional disturbance, and
the interpretation of such features can be
complex.
The discovery of Late-glacial tephra
horizons on the British mainland represents
a significant advance. It allows precise cor-
relation with other high resolution se-
quences in the North Atlantic region, e.g.
Greenland ice cores, avoiding the complex-
ities inherent in correlations attempted on
the basis of radiocarbon dating (e.g. radio-
carbon plateaux and contamination.
The Faroe Islands lie in an ideal location
(in the North Atlantic, midway between
Iceland and mainland northwest Europe)
for searching for new Late-glacial tephras.
If equivalent tephras, marked by sulphate
peaks, can be traced in the GISP2 ice core
then theories of tephra dispersal can be test-
Fig. 1: Location of six sites investigated.
Mynd 1: Støðukort, ið vísir seks støð, sum eru kannað.
ed (Zielinski et al., 1996). The type site of
the earliest of the four main components of
NAAZO, the Saksunarvatn Tephra (-9140
± 160 and 9180 ± 140; Jóhansen, 1975), is
Site Name Lat. (°) Long. (°) Depositional Environment Maximum Maximum shard
Depth concentration
(m) (number shards per
cm3 wet sediment)
Vedde Borrobol
Ash Tephra
1 Borrobol 58° 09' 30" N 03° 50’ 00" W infilled lake basin 5 6222 373
2 Tanera More 58° 00' 24" N 05° 23’ 36” W infilled isolation basin 8 259 17
3 Tynaspirit West 56° 13' 10” N 04° 10’00" W infdled kettle hole 9.5 128 9
4 Whitrig Bog 55° 36’ 02” N 02° 36’ 00” W infdled lake basin in interdrumlin hollow2.95 743 65
5 Muir Park Reservoir 56° 05’ 11” N 04° 16’ 58” W infdled lake basin 8 52 -
6 Kennethmont 570 21’ 03” N 02°46’ 25” W infdled hollow (non-lacustrine) 2.5 22 _
Table 2: Site locations, associated information and maximum concentration of Vedde Ash and Borrobol Tephra
shards found at each site. For Muir Park Reservoir and Kennethmont organic Late-glacial Interstadial
deposits, which the Borrobol Tephra wasfound in at the otherfour sites, were not available for examination.
Talva 2: Staðsetingar og upplýsingar í sambandi við tær og hámarkskonsentratión av brotum úr Vedde-øsku og
Borrobol-tefru, sum eru funnin á hvørjum stað. í Muir Park Reservoir og Kennethmont bar ikki til at kanna
lívrunnin seinglasial millumstøðusetløg, sum Borrobol-tefran var funnin í á hinum fýra støðunum.