THE GEOLOGY OF THE F#ROE ISLANDS. 225 
with below that horizon, so that anamesites predominate in Suderée, and 
dolerites in the northern islands. 
The anamesites of Suderée are, upon the whole, less strikingly amygda- 
loidal than the basalt-rocks of the northern islands, and the cavities seldom or 
never attain the large size that is frequently to be seen in the rocks of Stromiée 
and Osterde. They are generally, but by no means always, drawn out in the 
plane of the bedding, and have thus often a flattened appearance; frequently, 
however, they are almost circular, but more commonly still, perhaps, their 
shape is ragged and irregular. I have mentioned the fact that amygdaloidal 
areas often traverse the face of the rock in the plane of bedding, so as to form 
more or less well-defined lines. They also occasionally show a kind of 
curled, coiled, or involved arrangement, as if the rock had been rolled over 
upon itself while in a plastic or viscous state. Some of the largest amygda- 
loidal cavities we saw were in the rocks of Nakin and on the sea-coast at Waag, 
where they contain very beautiful zeolites. I noticed here stilbite, chabasite, 
quartz, and calcedony. Heulandite is said also to occur in amygdaloidal 
cavities in Suderée, and chloropheite is found at Qvalbée. Probably other 
minerals are to be met with, for I made no special search. According to 
TREVELYAN, native copper is very frequent, though not abundant. Near 
Famarasund he found it in thin plates in a bed of “claystone ;” some of it, 
he says, contains gold, which is “also, but rarely, found separate.” The place 
referred to by him is near the base of a sea-cliff which the boatmen pointed 
“out to us as we sailed past, but we could not stop to visit it. 
The upper and under surfaces of the anamesites form an interesting study. 
Sometimes the upper portion for several feet in thickness appears to be 
composed of a jumbled mass of irregular-shaped fragments of scoriaceous rock, 
which gradually shades, as it were, into the denser, non-porous crystalline 
mass of which it forms the crust. In other cases, however, the slaggy part 
appeared somewhat distinctly marked off from the denser rock on which it 
seemed to rest. Here and there the beds show a wrinkled and crumpled 
surface like that assumed by viscous bodies in motion. Some anamesites, 
again, appeared to have little or no scoriform crust, but were only somewhat 
amygdaloidal and vesicular atop,—the rock then having a tendency to weather 
into spheroidal masses. This latter character, however, was more frequently 
characteristic of the lower or under surfaces of the beds. These basal por- 
tions, so far as I had opportunity in Suderée of observing them, appeared to 
be less scoriaceous than the upper surfaces, and they were often much less 
amygdaloidal and vesicular than the central part of the same flow. Sometimes 
one might detect bits of red tuff and shale caught up in the under surface of 
an anamesite, and very often the beds showed strong red discolorations 
below, when they came into contact with a pavement of tuff. Now and 
VOL. XXX. PART I. 2M 
