During the last ice age the glacier at the center of Iceland was 1000-1500m thick and therefore it is unlikely that the magma that formed the pillows came up under the glacier.
Á síðustu ísöld var jökullinn við miðju landsins 1000-1500m þykkur og því er ólíklegt að bólstrarnir hafi myndast undir honum.