THE GEOLOGY OF THE FAROE ISLANDS. 229 
appearance. The mode of occurrence of these thin lines and streaks of coal in 
the shale seems clearly to indicate deposition in water of vegetable débris and 
muddy sediment. The shales and clays are generally dark dull grey, but 
sometimes they are rusty brown ; in close contact with the thicker coals they 
are usually very dark or black. In some places, as at Syd i Hauge (see Plate 
XIII. fig. 8), they have quite a tufaceous aspect, are dull green in colour, and 
do not differ from the green tufaceous shales which are sometimes met with 
between separate beds of anamesite. 
The outcrop of the coal-beds is shown upon the accompanying map, and 
does not differ much from that given by FoRCHHAMMER. JOHNSTRUP’s map only 
indicates the areas over which, according to his opinion, the coals extend. He 
has also left uncoloured those parts of the coal-beds that are at a lower level 
than the sea, and consequently considerable tracts in the north and north-east 
of Suderée are ignored as coal-bearing. In the mountainous tracts of Borga- 
knappen and Kvannafield the coal-bearing strata seemed to us likewise to have 
a wider extension than JoHNSTRUP’s map allows. The line of bedding could be 
quite well followed from Kvannafield round to Borgaknappen, and the same 
beds occupy a considerable area in Tuanahelgafield. Of course, I do not 
maintain that workable coal will be found everywhere along the outcrop given 
upon the map. The seams, as | have said, thicken and thin out irregularly, 
and in no part of the coal-field probably will they be found to preserve for any 
distance an equable thickness or even to be continuously present. The line of 
outcrop simply indicates the geological horizon of the coal—the outcrop of 
the shales and clays in which the coals are found. 
The dip of the strata in Suderée is uniformly N.N.E. Between Waag and 
Kvannafield the inclination probably does not average over 2° or 3°. It increases 
slightly north, and at Frodbéenypen (see Plate XIV. fig. 9), it is as much as 11°; 
at Kvanhauge the rocks dip at 10° to 14°. Owing to the lowness of the dip, it 
will be seen that the coal-strata occur as isolated cappings on the crests of 
the high grounds in the middle of the island (see Plate XIII. figs. 1 and 4). 
5. Coal, &c. of Myggences and Tindholm.—The only other islands in which 
coal occurs are Myggenes and Tindholm,* in Sdrwaagsfiord. We did not 
visit these, but I may mention what FoRCHHAMMER says about them. The coal 
of Myggenees, according to this authority, occurs as a thin layer, from + of an 
inch to 5 inches thick, embedded im a brownish clay or clunch. Associated 
with this clunch is a black schistose clay which now and then contains reed- 
like impressions, like those which occur in the black shales or schistose clays 
of Suderée. The whole thickness of the coal-bearing beds is from 38 to 6 feet. 
They occur at an elevation of 1000 feet. 
* According to an old writer (HENSCHEL), whose MSS. are in the Royal Danish Archives, coal is 
said to occur in Gaasholm and in Waagiée. But it seems this is doubtful (JonnstrRup). 
