Geology and Mull's rocks
Geologists love Mull because it has such a long and interesting history (the oldest rocks on Iona are about 2000 million years old), and it has unique structures and rocks found nowhere else in the world (such as the Loch Ba Ring Dyke and felsite).
Mull's Geology is seen everywhere and its a unique vision into the history of time
Carsaig Arches
Carsaig Bay is one of the most scenically beautiful locations on the south coast of Mull and a haven for geologists, walkers and wildlife enthusiasts. The hamlet of Carsaig lies enclosed in a natural amphitheatre of towering basalt cliffs, producing some of the highest and most spectacular coastal scenery on the island. READ MORE
The Fossil Tree at Berg showing a tree becoming part of the Geology
Fossil Tree
The extremely exposed location of the Burg peninsula on the Isle of Mull gives it the name 'The Wilderness'. Burg was bequeathed to the National Trust in 1932 and was one of the first properties to come into the care of The National Trust for Scotland. READ MORE
Walk into the geology of Mull
Mackinnon's Cave
Steeped in myth and magic and with great geological and topographical fascination, the short walk to MacKinnon’s Cave can be a testing scramble over muddy ground and a large boulder beach before the entrance to Abbot MacKinnon’s cave is reached. READ MORE
Detailed Geology of Mull
Mull is constructed rather like a multi-tiered wedding cake. Thick layers of basalt lava sit on top of a complicated basement of much older rocks which peep out around the edges of Mull rather like the silver base does on the lowest wedding cake tier.
Geologists love Mull because it has such a long and interesting history (its oldest rocks on Iona are about 2000 million years old), and it has unique structures and rocks found nowhere else in the world (such as the Loch Ba Ring Dyke and felsite).
Mull has not always been in its present position and form. Over geological time it has undergone enormous changes. Mull’s oldest rocks formed way south in the southern hemisphere and Mull (in common with the British Isles) has gradually drifted northwards to its present day position. (In the process of continental drift.)
Its rocks preserve details of the climatic zones that it passed through on its northward journey. For example, if you stand on the rocky shore opposite Inch Kenneth at Gribun you will be standing on sandstones deposited in a desert region at the same sort of latitude and rather like the Persian Gulf today.
Most of Mull is made of lava poured out of fissure volcanos when the North Atlantic was forming and Mull was torn apart from its ‘neighbour’ Greenland as the vast super-continent which once joined North America and Europe divided. The molten lava which erupted from about 60 to 50 million years ago forms Mull’s ‘stepped’ tablelands. Into these, at a later stage, intrusions of other ‘rocks formed by fire’ took place, forming the mountains of Mull’s famous Central Igneous Complex. Volcanic explosions and intense earthquakes shook Mull at that time and one of the old fault lines, the Great Glen fault is still occasionally active. (Nothing catastrophic!)
Mull’s final shape and geology has largely been carved by huge glaciers which only melted away from Mull 10,000 years ago leaving deep ‘U’ shaped valleys between the mountains and long glaciated lochs both freshwater and marine.
Mull doesn’t have any precious gems at the surface, but geologists know that deep below Mull, in the earth’s mantle there must be priceless minerals at this spot, but the temperature at that depth would melt any drills probing for them! Mull with its incredible history and unique rocks, geology and intrusions is a ‘Mecca’ for geologists who travel from all over the world to carry out field work here.
Click here for information on exploring the geologically impressive Ardmeanach Peninsula, otherwise known as The Wilderness and visiting the famous Fossil Tree.