in the extremely beautiful area surrounding Bifrost and the lava field
are 3600-4000 years old.
No tholoid mountains are found in Iceland. This mountain is a shallow, alkaline laccolith, probably
created by a sub-glacial eruption like Mt. Hlidarfjall on Lake Myvatn
and Mts. Hagongur in the interior.
Snaefell's Peninsula has
relatively large alkaline areas, rhyolite and granofire intrusions. Its eruptive areas, like those in the South, are the
so-called Flank Zones. Mt.
Snaefell is a dormant, alkaline, andesite volcano.
This strato volcano erupted about 1760 and 3000 years ago.
These eruptions were highly explosive and diffusive.
It is likely, that a few minor eruptions, which explain the
existence of the smaller craters around the volcano, took place later.
over east of the Snaefell volcano and depicts craters and rhyolite
Berserk Lava Field
created almost at the same time as the Grabrok craters and lava field,
3600-4000 years ago.
created 5000-8000 years ago in an effusive eruption.
created about 2600 years ago.
created about 1100 years ago.