Iceland was mostly covered with glaciers during the
Late Pleistocene. Volcanic eruptions under the glacial ice produced
a characteristic volcanological landform, the table mountain.
Herdubreid, located in northeastern Iceland, is one of the best
examples of this feature. Table mountains often consist of a lower
section of pillow lavas, then a thick section of hyaloclastite
deposits, and are generally topped off with lava flows. This sequence
represents the progression of the volcano through the ice.