Geology of Mull

Basalt-Staff-Home-Page-Feature-JS-01.jpgBasalt columns at the mouth of Fingal's Cave, Isle of Staff. Photo: John Sawyer.

It is easy to get carried away by Mull's wildlife but there is an equally interesting aspect to Wild Mull. That is the island's geology which has been shaped and layered for more than 2 billion years!

The dominant feature of Mull's geology is the black basalt terracing which formed when lava poured out of volcanos approximately 60 to 50 million years ago. There are, however, 11 major rock types on the Isle of Mull:

  • Tertiary igneous rocks of Central Intrusive Complex
  • Tertiary basalt lavas - by far the most widespread of all the rock types occuring across all of northern Mull, the Ardmeanach peninsula and the easter part of the Ross of Mull.
  • Mesozoic sediments
  • Lavas of Old Red Sandstone age
  • Granites of Caledonian Suite
  • Dalradian limestone
  • Epidiorite and hornblend schists (Dalradian)
  • Dalradian schist, phyllite, quartzite etc
  • Moine schists and gneisses
  • Torridonian sandstones
  • Lewsian gneiss
Further reading

Mull Historical and Archaeological Society - this aims to provide an overview of the historical sites on the Isle of Mull and its neighbouring islands.



This page last updated on 21 Jul 2014