Jökull - 01.01.2009, Side 46

Leó Kristjánsson
Figure 3. A composite stratigraphic scheme for the Arnarfjörður- Breiðafjörður profiles. On the right is a
slightly simplified stratigraphic column by J. Preston (Kristjánsson et al., 1975), into which the present profiles
have been fitted. A tentative polarity-zone scheme for the area is to the left of the profiles. – Samsett jarðlaga-
súla fyrir svæðið milli Arnarfjarðar og Breiðafjarðar. Hægra megin er teikning J. Prestons (Kristjánsson og fl.,
1975), í miðju er áætluð staðsetning hinna ýmsu sýnasöfnunarsniða miðað við hana, og vinstra megin er sýnt
hvar segulskautið hafi haldið sig meðan jarðlagastafli svæðisins byggðist upp.
Dougall et al. (1984) indicates that the stratigraphic
position of the lignite bed is not far below the top of
a zone of normal polarity. This situation which needs
to be investigated in greater detail, is similar to that
in the study of Kristjánsson et al. (2003) where the
polarity-zone pattern around the thick lignite-bearing
sediments south of Ísafjarðardjúp varied from profile
to profile.
PS 1–24 are mostly of normal polarity. If the
reverse polarity zone just discussed occurs in PS, it
is only represented by the single flow PS 7 which
overlies a clastic sediment. According to J. Preston’s
stratigraphic scheme and map, this profile should con-
tain his “Upper cumulate plagioclase basalt”. It is
probably flow PS 13, flow 14 also being highly por-
phyritic. Flows PS 12 and 13 yield low-latitude VGPs.
46 JÖKULL No. 59