Jökull - 01.01.2005, Blaðsíða 80

Kate T. Smith and Hreinn Haraldsson
Figure 3. Sedimentary logs illustrating the relationships between the buried trees, surrounding deposits and sim-
ilar deposits upstream. Tephra layers from historical time have calendar ages and prehistoric dates are stated in
14C years BP (from Þórarinsson 1975, Larsen 1979, Hammer et al. 1980, Dugmore 1987, Grönvold et al. 1995,
Zielinski et al. 1995, 1997, Smith 2004). Volcanic systems are: K, Katla; H, Hekla; E, Eldgjá; V, Veiðivötn.
Layer H is a tephra layer from Eyjafjallajökull. (*) is location of tephra sample ‘76-2’, see Table 2 (from Smith,
2004). – Snið setlaga sem sýna tengsl milli trjáleifa, setsins umhverfis þær og sets ofar á Markarfljótsaurum.
Gjóskulög frá sögulegum tíma sýna almanaksár og forsögulegur tími er sýndur í C 14 árum. Eldstöðvakerfi eru:
K=Katla, H=Hekla, E=Eldgjá, V=Veiðivötn. Lag H er gjóskulag frá Eyjafjallajökli. (*) sýnir staðsetningu
gjóskulagsins “76-2”, sjá töflu 2.
of the uppermost sections of this deposit can no longer
be determined. This tephra-rich unit is underlain by
pale olive-yellow clay includingfine black tephra. Be-
neath this, the trees, where standing, are rooted in c.
10 cm thick mottled grey-green silt, with underlying
clast-supported gravels.
Stratigraphically related deposits
East of Drumbabót, north of the abandoned farm
site Aurasel, horizontally bedded granules overlay
a coarse tephra-rich sand unit with cross-bedding,
ripple laminations and silt drapes. These deposits
are deltaic in appearance suggesting deposition into
standing water. The increase in grain size up the pro-
80 JÖKULL No. 55