500 Henry J. Seymour — Irish Minerals. 



Dicellograptiis, and Pleurograptus were indicative, whilst tlie higher 

 zone is distinguished by such as Monograptus convolutus and JIf. tenuis, 

 as also Diplograptus folium, or palmeus, which is somewhat rare 

 outside the Coalpit Bay district. 



The fossils of the Silurian rocks of Sheet 81 are dealt with 

 rather fully in the memoirs of that and the adjoining Sheet 91, in 

 which latter the district of Slane afforded a rich harvest of forms 

 ranging from Llandeilo to Wenlock. Sheet 82 had been hitherto 

 regarded as a barren area so far as fossils were concerned ; however, 

 a close search disclosed at a couple of localities near Clogher Head 

 the existence of the zone of Monograptus exiguus, or top of Upper 

 Llandovery, and in addition to M. exiguus beautifully preserved 

 specimens of Monograptus attenuatus, crispus, proteus, and lobiferus 

 were procured ; indeed, at no other locality save Tieveshilly were the 

 same peculiar forms observed. 



VI. — A (Preliminary) List of the Minerals occurring in 



Ireland.^ 



By Henky J. Seymour, B.A., F.G.S. 



THE literature dealing with Irish mineralogy is rather extensive, 

 much more so than might be at first thought, but it is of such 

 a scattered nature that to obtain at present anything like a complete 

 account of the minerals which occur in this country, or in any 

 particular portion of it, would involve much time and labour in 

 hunting up the publications containing the various records. The 

 need of some authentic work of reference on the subject, revised to 

 date, was often felt by the writer, who some years ago set to work 

 to collect together all the data available, both from published 

 records and by means of a personal examination of such public 

 and private collections of minerals in this country as he could 

 gain access to. 



This research is not yet complete, but the publication last year of 

 a list of Scottish minerals at the British Association meeting in 

 Glasgow has induced the writer, in view of the meeting of the same 

 Association in Belfast this year, to publish a preliminary list of Irish 

 minerals. This list comprises the various species which up to the 

 present he is satisfied may be regarded as undoubtedly occurring in 

 Ireland. Eeferences were made to the lists of Irish minerals which 

 have already been published, the last in 1868. These have appeared 

 as appendices to lists from other localities, and in publications now 

 out of print. G. H. Kinahan's publication (Economic Geo!, of 

 Ireland) dealt solely with metallic ores and a few other economic 

 minerals. In the account which the writer hopes to have ready for 

 publication within a year, the occurrence of Irish minerals only will 

 be mentioned, together with other important details of interest, and 



1 Abstract of a paper read before the British Association, Belfast, September, 1902, 

 in Section C (Geology). 



