On The Other Hand, In The Almanna Gja, You Can
Easily Distinguish On The One Face Marks And Formations
Exactly Corresponding, Though At A Different Level, With
Those On The Face Opposite, So Cleanly Were They Separated.
[Figure: fig-p051.gif with the following caption:
1 Plain of Thingvalla.
2 Lake.
3 Lava plateau.
4 Almanna Gja.
5 Rabna Gja.]
2. Is the sea of lava now lying on the top of the original
surface. Its depth I had no means of ascertaining.
3. Is the level of the surface first formed when the lava
was still hot.
4. Is the plain of Thingvalla, eight miles broad, its
surface shattered into a network of innumerable crevices
and fissures fifty or sixty feet deep, and each wide
enough to have swallowed the entire company of Korah. At
the foot of the plain lies a vast lake, into which,
indeed, it may be said to slope, with a gradual inclination
from the north, the imprisoned waters having burst up
through the lava strata, as it subsided beneath them.
Gazing down through their emerald depths, you can still
follow the pattern traced on the surface of the bottom,
by cracks and chasms similar to those into which the dry
portion of Thingvalla has been shivered.
The accompanying ground plan will, I trust, complete what
is wanting to fill up the picture I so long to conjure
up before the mind's eye. It is the last card I have to
play, and, if unsuccessful, I must give up the task in
despair.
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