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Mr. Weaver on the 
mentioned ; but for a short distance only in the lower part, loose 
stones and soil concealing the greater part of the line. The first 
firm rock visible in descending the ravine, is granite, which lower 
down is succeeded by mica slate, and these two rocks then re- 
peatedly alternate, in thick massy beds, ranging east and west, and 
dipping 45° north, loose fragments again preventing farther obser- 
vation. 
§ 42. The phenomena presented to our consideration in these 
two ravines, as well as in other analogous portions of the granite 
and mica slate tracts, seem to admit but of one satisfactory solution • 
that of contemporaneous origin. 
§ 43. In proceeding up the south-eastern brow of Seechon, 
facing Seefiniane, we perceive the mica slate cropping out to the 
surface in strata, ranging east and west, and nearly horizontal, but 
dipping slightly north. The rock contains frequent layers, contem- 
poraneous masses and veins of quartz. 
In the long south-western arm of Seechon, mica slate appears 
soon to give place, and to pass into clay slate, containing frequent 
beds of greenstone, greenstone slate, and greenstone porphyry, and 
occasionally of quartz also. An examination of the north-western 
arm to its junction with the Tallow hills, presents the same results, 
but in a more satisfactory manner; as the rocks are bared for 
inspection in many places, by quarries, or by natural causes. In 
the lower and northern part of Seechon, particularly toward 
Ballinascorney Gap, the interstratified trap rocks greatly predo- 
minate, and some of them are highly crystalline. All these rocks 
exhibit a general range of 15° north of east and south of west, and 
a dip of 75° toward the south, which is in opposition to the sub- 
jacent mica slate. 
Does the clay slate rest unconformably on the mica slate, or does 
