Jökull - 01.12.1979, Blaðsíða 17

Fig. 8. Schematic stratigraphic section through
the Tjömes sequence. Compiled from Th.
Einarsson et al., 1967; Norton, 1977 and K. J.
Albertsson, 1978. Sediment is dotted. Broken lines
in the lowest part of the section indicate lignite
beds. Vertical lines are flows of normal polarity.
Horizontal lines are flows of reverse polarity.
Fig. 9. Schematized section through the Plio-
Pleistocene of Jökuldalur. From McDougall and
Wensink, 1966.
glacial volcanics, as do also some of the glacial
horizons in the Esja section (Fig. 7).
The most continuous sections of the lower part of
the Plio-Pleistocene strata mapped so far are those
of western Iceland. For the period from the Mam-
moth event of the Gauss epoch up to the Gilsá event
of the Matuyama (3.1 up to 1.8 m.y. ago) the
frequency of glaciations averages one every
JÖKULL 29. AR 15