Mull’s famous fossil tree (Part 1): Chrissie and the tree

Rosalind Jones (UK) There’s a saying on the Isle of Mull – “If you come to Mull the once you return again for sure” – and it’s not an idle boast, as those who have visited and subsequently revisited this ‘geological Mecca’ will agree. Second largest of the Inner Hebrides, Mull is famous for its Tertiary igneous geology – 6,000 feet of basalt lavas intruded by a complex of concentric bodies, ringed about three igneous centres. With its unique ring dyke of mixed acid and basic magma, Tertiary granites yielding Lewisian dates, and magnetic reversals in the lavas that make compass bearings untrustworthy, Mull is an enigmatic venue for geologists. The island’s best-known fossils are plant remains, including Ginkgo, Platinus, Corylites and Quercus, all preserved in Tertiary lake sediments deposited between lava flows. Once over collected, fossils from the famous Leaf Beds at Ardtun are now protected, as the site is an SSSI. But the biggest and most noteworthy fossil is ‘Macculloch’s Tree’. Remotely situated opposite Ardtun, on the tip of the Ardmeanach peninsula, it is a phenomenon that, if you visit Mull, you really should see. Fig. 1. Burg House. © Pete McHugh.I first came across Mull’s fossil tree as a geology student in 1966. Its location was pointed out while I was in the Ardtun Leaf Beds gully, so I scrambled over slippery rocks, past hexagonal columns of basalt and down to the shore to see. The panorama I beheld took my breath away. Fig. 2. Goat track … Read More

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