Rum layered intrusion

The Rum layered intrusion is located in Scotland, on the island of Rùm (Inner Hebrides). It is a mass of intrusive rock, of mafic-ultramafic composition,^[1] the remains of the eroded, solidified magma chamber of an extinct volcano^[2] that was active during the Palaeogene Period.^[3] It is associated with the nearby Skye intrusion and Skye, Mull and Eigg lavas.^[4] It was emplaced 60 million years ago above the Iceland hotspot.^[5][6]

Thin section of gabbro from Rum

Layers of mafic and ultramafic intrusive rocks forming the mountain of Hallival