160 
Mf. Weaver on the 
through Slieve Gadoe to Black mountain, and thence to Brissels- 
town hill ; the district lying between Tinoran and the western side 
of the glen of Imale, being composed principally of mica slate, 
which to the north gradually narrows and passes into clay slate. 
In the glen of Imale itself, we can trace with the eye a part of the 
line of junction between the granite and the mica slate, which rests 
upon it; namely (see PL 10. No. 17} in the western side of Black 
mountain, and in the detached portions in the form of caps, which 
spread down the western face of Lugnaquilla, form the summit of 
the picturesque Cadeen, and constitute its long north-eastern arm, 
and the mass of Brisselstown hill with its granite base. The glen 
of Imale, a basin surrounded by mountains, is founded altogether 
upon granite. 
§ 45. The mica slate in the north-eastern arm of Cadeen seems 
to form a shield-shaped mass, for granite occupies the foot in every 
direction. It ranges 25° north of west and south of east, and dips 
towards the south, extending westward as far nearly as the deep 
inlet or hollow which marks the northern face of the mountain. 
The south-eastern arm and the body consist of granite, while the 
cap which occupies the summit and extends to the east nearly to 
the inlet on the north, forms a sloping line in its base, spreading 
low down on the northern face, beneath which, in the brook, gra- 
nite is visible, supporting the mica slate ; (see PI. 10. No. 16. & 17.) 
The rock of the cap ranges north-east and south-west and dips 
65° south-east. It is remarkably full of andalusite, generally dis- 
posed in the direction of the laminae of the mica, which decaying, 
cruciform and stelliform groups are displayed, or a confused inter- 
laced aggregation of crystals becomes visible : but where the stone 
has been broken across and subsequently exposed to the action of 
the weather, the ends of the prismatic crystals protrude, forming 
