1906 
Skymour." 
. — Papers 011 J risk Geology. 
7 
occurrence of those now mentioned has been verified by the 
author, and the number of Irish species of minerals is accord- 
ingly raised to 127." 
In this connection may be mentioned the occurrence of 
Dopplerite, described by Mr. Moss {Set. Proc. R. D. S., vol. x., 
p. 93). This substance, consisting mainly of carbon and 
oxygen, with some hydrogen, was found by Mr. R. Bell in a 
peat bog at Sluggan, Co. Antrim. In the literature on this 
material, quoted by Mr. Moss, we note the omission of a 
previous Irish record, viz., that of the late G. V. Du Noyer, 
who described the occurrence of this substance in a bog cut 
through by the M.G.W. Railway near Cioncurry, Co. Kildare. 
(/. G. S. n., vol. xviii., 1847, p. 253). 
Geology of the Porcupine Bank. 
An examination of the rocks dredged from the floor of the 
Atlantic off the West coast of Ireland was undertaken by 
Professor Cole and Mr. Crooke, with a view to determine if 
they threw any light on the nature of the region now covered 
by the sea. Their results published (in Appendix IX., Pep. 
oj the Inla7id ajid Sea Fisheries, Ireland, for 1901) in 1903 seem 
to show that the floor of this region is made up of similar rocks 
to those constituting the " Dalradians" of the neighbouring 
land, the exception being the Porcupine Bank itself. This 
would appear to consist of a mass of gabbro, which the authors 
are inclined to refer to the Carboniferous period rather than to 
the Tertiary. It may, perhaps, be pointed out that undoubted 
tertiary rocks occur as far west as Bunowen, south-west of 
Clifden, Co. Galway. 
Banded Gneisses. 
In continuation of similar researches in Southern Donegal, 
Professor Cole discusses the origin of the banded gneisses of 
Tirerrill and Drumahair, Cos. Sligo and I^eitrim {Proc. R.I. A., 
vol. xxiv., sect. B., pt. 4, 1903), and again finds evidence that 
these gneisses also owe their production to igneous flow and 
absorption of previously consolidated material. He notes that 
the banded structure is usually more pronounced in the places 
where inclusions are most abundant. These gneisses are 
