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.