yee SS a 
XIX.—NOTE ON A NEW GEOLOGICAL MAP OF IRELAND, 
By PROFESSOR HULL, r.r.s., Drrector oF THE GEOLOGICAL 
SurvEY oF IRELAND. 
[Read May 20, 1878.] 
IN presenting a copy of his new Geological Map of Iveland, 
Professor Hull stated that although on the same scale as that of 
the late Professor Jukes (about eight miles to the inch), and in 
many respects resembling it, the new map had been entirely re- 
engraved. Owing to the progress of the Geological Survey since 
Professor Jukes’ map was published (1867), and an advance in 
our knowledge in some respects, several alterations (which the 
author hoped would be considered improvements) had been intro- 
duced. The following were the more important :— 
1st. In the metamorphic districts of Donegal, Mayo, and 
Galway, the great beds of quartzite, which form many of the 
higher elevations, and some of the beds of limestone had been in- 
troduced. In this respect the new map resembled that of Sir 
Richard Griffith, to which the author was indebted for being able 
to insert the quartzites and limestones of Donegal. 
2nd. The next point of importance was the colouring of the 
mountainous districts of Iveragh and Dunkerron, lying to the 
south of Dingle Bay, and of the promontory between Kenmare 
Bay and Bantry Bay. The former included the Reeks and Kil- 
larney Mountains; the latter those of Caha and Sheve Minish. 
On Griffith’s map, the rocks composing these ranges (except near 
their margins where they pass below the Lower Carboniferous 
beds) are coloured in the same way as “the Dingle Beds” of the 
promontory of Dingle, being considered identical in age. On the 
maps of the Geological Survey, and of Professor Jukes, on the 
other hand, the highlands of Kerry are coloured Old Red Sand- 
stone. In the Dingle promontory, as is well known, this formation 
rests on “the Dingle Beds” in a highly discordant manner; while 
in the districts south of Dingle Bay, no apparent unconformity 
exists, according to the observations of the Geological Surveyors ; 
