Rit (Vísindafélag Íslendinga) - 01.07.1962, Side 46

46
Although I cannot state that my negative findings for Sól-
heimaháls and Höskuldsstaðanúpur are significant it is never-
theless remarkable how well the noticed occurrences fit with
the other findings of different ages.1) In the area east of
Bárðardalur rhyolite pebhles seem to be of interest. I have
not noticed them in the gravels (2a) in Breiðavík or in the
gravels at Breiðamýri. The latter are covered by Fljótsheiði
lavas which are connected with the volcanic neck Kálfhorg,
and are probably younger than the Bárðardalur displacement.
These nearly horizontal lavas overlie at Kálfborgará steeply
tilted and fractured basalts containing vestiges of frost action
(Young Plateau Basalts) and a gravel layer with rhyolite
pebbles. This suggests that the Young Plateau Basalts con-
nected with rhyolite pebbles lie below Breiðavík.
Finally let us state that the old peneplane stage, the base
of the Young rocks, ended with intensive transport of gravel
and sand. There must have been large strong rivers but also
strong winds and a cold climate. The accumulations of gravel
and sand speak rather against a high level of the plane, so
that most reasonably the frost and glaciations evidenced in
the sediments below and within the Young Plateau Basalts
mean really cold climate at sea level. The fluviatile sediments
within the Young Plateau Basalts speak also for low eleva-
tion; at a high elevation the water would have flowed more
as ground water or soon have formed a valley topography.
*) In a later search I found sparse rhyolite pehbles in Sólheimaháls.