1823.] Geological Society. 71 



two thick beds of a hard greyish clay, which crumbles on expo- 

 sure to the air, and which contains sometimes numerous nodules 

 of a rich ironstone (carbonate of iron). The coal in Suderoe is 

 seen rising from the level of the sea through an extensive tract 

 of country (which the author describes), until it reaches an ele- 

 vation of above 1000 feet. Basaltic veins of various descriptions 

 are very frequent ; sometimes they alter, but seldom disturb, the 

 strata they pass through ; they are frequently accompanied by 

 thick veins of zeolite, in a state exactly resembling the steatite 

 of Cornwall. The coal, however, at Toidnences is disturbed by 

 insinuated masses of basalt. Slips are not frequent in Ferroe, 

 but a remarkable one is described in Soinoe, cavities of great 

 length, perfectly circular, extending in a direct line, and 

 incrusted with zeolite, are common ; one was seen, of which the 

 one side was filled with compact zeolite ; the other with clay 

 ironstone. Conglomerates are common ; one only was observed 

 of rolled pebbles, apparently of the rocks of the island. In two 

 of the islands, a bed of greenstone, in some parts columnar, is 

 seen of great extent : it is 100 feet in thickness. 



Native copper is very frequent, but not abundant, in most of 

 the rocks. At Famarasund, in Suderoe, it occurs in clay iron- 

 stone, in thin plates ; in the other rocks, it is generally crystal- 

 lized, frequently inclosed in zeolite. Specimens of most of the 

 zeolite family were procured, and a variety of tabular calc spar, 

 first found in Ferroe by Sir G. Mackenzie, and unknown else- 

 where. 



On his return, Mr. Trevelyan, in passing from Fludstrand, in 

 Jutland, to Copenhagen, crossed a considerable extent of chalk: 

 the whole of the country is covered with large rolled blocks of 

 various primitive rocks. 



Near Fludstrand are some beds of sand, clay, and marl, appa- 

 rently above the chalk. 



The letter concludes with observations on the aurora borealis, 

 and with reasons tending to confirm the opinion that Ferroe is 

 the Thule of the ancients. 



ROYAL GEOLOGICAL SOCIETY OF CORNWALL. 



Ninth Annual Report of the Council. — The progress of the 

 institution since the last anniversary, if not equal to the wishes 

 of its friends, is at least encouraging ; though the Society had 

 to regret the loss of their late able Secretary, Dr. Forbes, whose 

 professional pursuits occasioned his removing from this county; 

 and the Council considered it clue to the zeal and ability dis- 

 played by that gentleman, to elect him an Honorary Member. 



The cabinets have been enriched by many valuable donations; 

 and in particular by a splendid series of minerals from Mount 

 Vesuvius, for which the Society is indebted to the kindness of 

 their illustrious townsman, Sir Humphry Davy. The value of 

 this accession to the Museum is not a little enhanced by the 



