Vol. 59.] ANNIVERSARY ADDRESS OF THE PRESIDENT. ly 



knowledge of the Lower Carboniferous rocks, and of their gradual 

 modification as they are followed northward into Scotland. For 

 many years geologists experienced some difficulty in correlating the 

 subdivisions of that system in the two countries. But the careful 

 tracing of the respective zones from Yorkshire northward to Berwick, 

 in which Mr. Gunn had a prominent share, threw important light 

 on the subject. Indeed, his paper on i The Correlation of the 

 Lower Carboniferous Eocks of England & Scotland,' published 

 in the Transactions of the Edinburgh Geological Society for 1898, 

 is one of the leading contributions to the study of this question. 



In 1884, Mr. Gunn was transferred to Scotland, where he dis- 

 played marked power in dealing with questions of complicated 

 stratigraphy. He took part in the detailed mapping of the North- 

 Western Highlands, and he surveyed Arran, Bute, the Cumbraes, and 

 part of Cowall. Nowhere did he display his power as a field-geologist 

 with greater success than in Arran, that paradise of Scottish 

 geologists. His complete demonstration of the unconformity 

 between the red sandstones, now known to be of Triassic age, and 

 all older formations in the island, and his identification of volcanic 

 rocks ranging from the schistose rocks of the Highland Border to 

 those of Tertiary time, are sufficient testimony of his powers of 

 accurate observation and sound reasoning. 



Mr. Gunn was author of memoirs published by the Geological 

 Survey on Belford, Holy Island, and the Earne Islands, on the 

 coast south of Berwick, on Norhain and Tweedmouth ; and he was 

 joint author of memoirs on Wooler and Coldstream, on Ingleborough, 

 and on Cowall in Argyllshire. Before his death he was engaged in 

 finishing the proof-sheets of the memoir on ' The Geology of Central 

 & Northern Arran,' and the manuscript relating to the southern 

 part of that island. 



In 1884 he was promoted to the rank of Geologist ; in 1901 to 

 that of District-Geologist. He retired on September 27th, 1902, 

 and died a few weeks later, on October 22nd. [J. H.] 



Alered Yaughan Jennings was born in 1864, and was educated 

 at St. Paul's School, and at the Normal School of Science and 

 Royal School of Mines, now the Royal College of Science, London. 

 Here he soon distinguished himself by his work in natural history 

 and geology, and was appointed Assistant in the Geological Labora- 

 tory, under Prof. J. W. Judd. His health was, unfortunately, at no 

 time good, and this led him to resign his appointment in 1889. 



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