226 
Mr. Weaver on the 
toward the house, we perceive only rocks of an analogous descrip- 
tion, the general range of which appears to be nearly east and west, 
agreeing with that on the coast, although in some places inflected. 
The prevailing dip is to the south, varying from 50° to an almost 
horizontal position, being also in some parts inflected. 
The limestone on this coast is bluish grey and even blackish grey, 
and of a varying texture, compact, partly foliated, and even nearly 
granularly foliated. In its fracture it exhibits no distinct petrifactions, 
yet when examined below the line where it has been acted upon by 
the sea, organic remains are displayed in the most marked manner, 
protruding above the surface of the wasted stone. They consist 
principally of zoophytes, with some bivalves. In the conglomerate 
rock under the pigeon-house in the Park, (the base of which is a 
mixture of limestone and greenstone enveloping pebbles of limestone 
and greenstone), bivalves, entrochites, and madreporites may be ob- 
served. 
I have frequently remarked that the same secondary limestone, 
which on the fresh fracture exhibited no appearance of organic 
remains, after exposure to the influence of the atmosphere for a 
length of time, became partially wasted, leaving a surface studded 
with petrifactions. 
§ 124. In the isle of Lambay, the upper grounds are studded 
with rocky knolls, while an the brows, projecting crags are also ob- 
servable here and there ; but along the coast, which on the south,, 
the east, and the north, is abrupt and precipitous, the cliffs afford 
opportunity for examining the component rocks. The western 
side also, though depressed and flat in comparison, presents the 
same advantage, a low ledge of rocks lining the banks, and craggy 
prominences protruding above the beach \ (see Plate 8. No. 9. and 
9. No. 13.) 
