The Old Lake

Remains of lake sediment thrown up in the explosions forming
the "pseudocraters" indicate that before the enormous eruption
in the crater row Þrengslaborgir-Lúdentarborgir a large lake
resided in the Mývatn depression.

This lake was wiped out by the lava-flow, 2300 years ago,
and the present lake Mývatn was formed.
 

The sediment remains make it possible to map the
minimum extent of the old lake.


REFERENCES

Árni Einarsson 1982. The palaeolimnology of Lake Mývatn, northern Iceland: Plant and animal microfossils in the sediment. Freshwater Biology 12: 63-82.

Árni Einarsson. 1991. Lífríki í 2000 ár. Bls. 320-336 í: Náttúra Mývatns. Eds.: Arnþór Garðarsson & Árni Einarsson. Hið íslenska Náttúrufræðifélag, Reykjavík. (2000 years history of life in Lake Myvatn, in Icelandic). (Source of the pictures above.)