107 
Geological Relations of the East of Ireland . 
blackish green. The grains are sometimes so minute, that the 
stone appears almost compact. Sometimes also small particles and 
cubical crystals of iron pyrites are disseminated through the rock, 
which, when decomposing, communicate to the stone an iron-shot 
spotted appearance. 
§ 55. The clay slate and greywacke throughout the whole 
tract to the southward, the limits of which have been already 
adverted to, partake more or less of the characters now described, 
and maintain nearly the same range and dip. 
Eastern Division . 
§ 56. Returning to the eastern side of the granite chain, we 
find clay slate spreading over a more extended space, bounded by 
the Irish channel on the east, principally by older rocks on the 
west, and stretching from the northern part of the county of Wick- 
low nearly to the southern extremity of the county of Wexford. 
To this tract belongs also the hill of Howth on the north side of 
Dublin bay, and likewise Irelands’ Eye. In its course, it is, in 
different parts, associated with granite, mica slate, quartz rock, 
flinty slate, greywacke, trap, and porphyry. 
§ 57. The strata in the northern and southern portions of this 
tract are in some places considerably inflected ; in the middle por- 
tion they maintain a pretty uniform north-east and south-tyest 
direction, with a dip to the south-east; while the south-eastern 
quarter has an inclination toward the north-west. 
§ 58. In the south-west we find clay slate immediately in con- 
tact with granite. It surrounds the two projecting masses of this 
rock, which occur between Inistiogue on the north and the con- 
