Herdubreid in northern Iceland is a classic example of a Tuyas
or Table Mountain.
The volcano originally sat beneath the Vatnajokull ice sheet
which was much bigger during the "Ice Ages".
The weight of the ice confined the movement of the erupting
material and forced the volcano to grow vertically.
The interaction between lava and ice caused most of the mass
of the volcano to be composed of pillow lava.
The eruption finally broke through the ice and the lake that
the eruption had created, and produced the
subaerial flat lava flow seen near the summit.
A small cinder cone sits on top of the lava flow.
The stamp illustrated below was issued on March 9th, 1972.
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