THE PHYSICAL GEOLOGY OF THE NEIGHBOURHOOD 
OF DUBLIN. 
BY 
REV. MAXWELL H. CLOSE, F.G.S., 
With a Map. 
[Read February 18th, 1878.] 
Tue following account of the Physical Geology of the country 
around Dublin has been drawn up, principally from the Maps 
and accompanying explanations (Nos, 102, 112, and 121) pub- 
lished by the Irish Geological Survey, from papers in the Jour- 
nal of the Royal Geological Society of Ireland, in the Transac- 
tions and Proceedings of the Royal Irish Academy, and from 
the Journal of the Geological Society of London. For further 
information on the subject the reader may have recourse to the 
memoirs above named, to the late Professor Jukes’ “ Manual of 
Geology,” to Professor Hull’s “ Physical Geology and Geography 
of Ireland,” and to Mr, G. H. Kinahan’s “ Manual of the Geology 
of Ireland.” 
The immediate vicinity of Dublin is low-lying ground and 
was formerly called Sean Magh Ealta Edair, 7.e., The ancient 
plain of the flocks of Edar. It is part of the Carboniferous 
Limestone plain which so largely occupies the central region of 
Ireland, and which only reaches the coast in a few places, as near 
Dublin. On the south side of Dublin the older rocks emerge 
from beneath the Limestone and rise to form the hill country of 
S. Dublin, Wicklow, and Wexford counties. Northward of Dub- 
lin Bay there are isolated exposures of the older rocks in the Hill 
of Howth, the islands of Ireland’s Eye and Lambay, on the ad- 
joining coast at Portrane, and in the country around Balbriggan. 
The following are the formations which present themselves 
within the district now to be described, viz., Cambrian, Lower 
Silurian, Old Red Sandstone (?), Carboniferous Limestone, Upper 
Carboniferous Shales (Yoredale), Granite and other igneous rocks, 
and Pleistocene Dritts, 
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