766 MK. F. E. C. REED ON" THE LOWEE PALEOZOIC [NoY. 1 899, 



of felsites with chips of slates, etc., embedded in a fine paste, which 

 with crossed nicols breaks up into an irregular granular aggregate 

 [18 w] [610] [611]. Those in the Carrigaghalia Series are of very 

 finely powdered materials and frequently calcareous, but call for 

 no further description [53 w] [644]. 



YI. COEEELATION OF THE RoCKS OF THE WaTEEFOED CoAST 

 WITH THOSE OF OTHEE ArEAS. 



The exact stratigraphical horizon of these beds has always been 

 a disputed point. Jukes ^ speaks of the limestone at Tramore as 

 resembling the Bala Limestone of North Wales. Salter,^ in de- 

 scribing trilobites from the Newtown Head sandy shales (Eaheen 

 Shales), speaks of these beds as Llandeilo Flags, but with regard to 

 those near Tramore calls them simply Lower Silurian.^ Jukes & 

 Haughton,'' and Kelly,^ compared the beds on palgeontological 

 grounds to the Bala of England and Wales. In the Memoir of the 

 Geological Survey of Ireland^ the beds are termed Bala, but Baily 

 considered that several horizons were represented. Salter'^ in 

 1864-65 described the species of Amj>hion from Tramore as occur- 

 ring in Caradoc Slate, and the Barrandia from Newtown Head as 

 occurring in Llandeilo Plags. Subsequently,*^ in his list of Irish 

 fossils in the Woodwardian Museum, he termed the Waterford beds 

 Lower Bala, noting that both Middle and Lower Bala appeared to 

 occur at Newtown Head. Kinahan^ correlated all the Waterford 

 fossiliferous beds with the Bala and Caradoc, including them all in 

 his ' Ballymoney Series.' The occurrence of Glenkiln Shales with 

 some of the typical graptolites was noted by Lapworth,^° but Baily ^^ 

 had previously determined many of the species. Davidson,^^ in 

 describing various brachiopoda from Newtown Head, Tramore, and 

 Dunabrattin, calls the beds in which they occur Caradoc. Messrs. 

 McHenry & Watts'^ in their guide-book say that the graptolites 

 at Tramore indicate the Llandeilo age of the black shales, etc., and 

 that the limestone is ' approximately equivalent to that of Llandeilo.' 

 Sir A. Geikie ^'* speaks of the Tramore Limestones as ' calcareous 

 bands full of Bala fossils.' 



The Tramore Limestones have been compared on palae- 



1 Journ. Geol. Soc. Dubl. vol. v (1852) p. 147. 



2 Mem. Geol, Surv. dec. vii (1853) pi. vi, p. 4. 



3 Ibid. pi. viii, p. 6. 



* Trans. Royal Irish Acad. vol. xxiii (1858) p. 563. 



5 Journ. Geol. Soc. Dubl. vol. viii (1860) p. 251. 



6 Explan. Sheets 167, 168, 178 & 179 (1865) pp. 9, 23. 



7 Monogr. Palseont. Soc. ' Brit. Trilob.' pp. 82, 140. 



8 ' Cat. Camb. Silur. Foss. Woodw. Mus.' 1873, p. 38. 



9 « Geol. of Irel.' 1878, pp. 27, 49. 



10 Ann. Mag. Nat. Hist. ser. 5, vol. iv (1879) p. 424. 



11 Quart. Journ. Geol. Soc. vol. xxv (1869) p. 158. 



i=» Monogr. Palseont. Soc. ' Brit. Silur. Brach.' vol. iii, pp. 51, 196, etc. 



13 ' Guide to Collects, of Rocks & Foss. Geol. Surv. Irel.' 1895, pp. 82 & 112. 



1* ' Anc. Vole, of Gr. Britain,' vol. i (1897) p. 248. 



