462 ON THE MINERALOGY OF THE FAROE ISLANDS. 



much resembles the Scotch coal generally consumed in Edin- 

 burgh. It is but little worked, owing to the want of time, and 

 peat being abundant, and more easily obtained. Scarcely any 

 is taken to the other islands, as they have no vessels of suffi- 

 cient size for that purpose. A few cargoes were carried some 

 years since to Copenhagen, but not being found to answer, the 

 exportations were discontinued. 



In the map of Suderoe, Plate XXIX, Fig. 8. copied from 

 Captain Born's chart, the spots where coal has been observed 

 are marked with a double line, and where it is worked, with a 

 broad black line. The section below the map shews the situa- 

 tion of the coal from the level of the sea to the summit of a 

 hill south of Famoye, where it is stated to occur, though we 

 could not perceive it, which might perhaps be owing to the su- 

 perincumbent rubbish. 



The coal on Myggenaeas appears to be in the same position, 

 but not of sufficient thickness to be worked. On Tindholm 

 are also appearances of it and the clay, apparently enclosed in 

 the trap. 



At Tiodnenaes, near Qualboe, a mass of columnar Basalt 

 is intruded into the place of the coal, which disappears near it, 

 as shewn in Fig. 1. 



The best instance of columnar basalt which we saw, is near 

 Frodboe in Suderoe ; it is well described in Landt's History 

 of Faroe. 



The marks of fusion, mentioned by Sir George Mackenzie, 

 are very frequent, and also another appearance which may 

 perhaps be connected with it. The upper part of many of the 

 beds (more particularly of the amygdaloidal), is filled with 

 small insular perpendicular cavities, as if caused by the escape 

 of a gaseous fluid, when the rock was in a soft state. They are 

 sometimes empty, but frequently contain zeolite. 



One 



