﻿THE 



QUARTERLY JOURNAL 



OF 



THE GEOLOGICAL SOCIETY OE LONDON. 



PROCEEDINGS 



OF 



THE GEOLOGICAL SOCIETY. 



January 8, 1851. 



Prof. Heinrich G. Bronn, Prof. Wilhelm Haidinger, Colonel 

 Gregorius Helmersen, and James Dana, Esq., were elected Foreign 

 Members. 



The following communications were read : — 



1. On Tertiary Leaf-Beds in the Isle of Mull. By the 

 Duke of Argyll, F.G.S. With a Note on the Vegetable 

 Remains from Ardtun Head. By Prof. E. Forbes, V.P.G.S. 



The Island of Mull is deeply indented in a direction nearly east and 

 west by two long arms of the sea, Loch na Kael and Loch Scridden, 

 forming the three natural divisions described by Macculloch as the 

 Northern, the Middle, and the Southern Trap Districts. The North- 

 ern division is of comparatively low elevation, and composed chiefly 

 of terraces of trap. I am not aware that it has ever been carefully 

 examined in detail ; but it has been understood not to present any 

 features of remarkable geological interest. The middle division is a 

 lofty and rugged tract, containing the fine summits of Ben Tulla and 

 Ben More, the latter being one of the highest mountains on the 



VOL. VII. PART I. H 



