48 REPORT — 1844. 



Amphion brongniarti, n. s. Leptsena depressa. 

 Turritella gregaria. „ lata. 



Euomphalus lloydi, II. s. ,, tenuistriata. 



Lingula attemiata (var. ?j Calenipora escharoides. 



,, lata (var. ?) Favosites alveolavis. 

 Atrypa affinis. ,, fibrosa. 



,, aspera. ? ,, gothlandica. 



,, hemisphffirica. „ multipora. 



Orthis canalis. „ polymorpha. 



„ costata. Porites pyriformis. 



,, flabellulum. ,, tubulata. 



„ orbicularis. Cyathophyllum turbinatum. 



„ plicata. ? Turbinolopsis bina. 



„ pecten? (var.). Tentaculites ornatus. 



,, sericea. ,, scalaris. 



In the line of section the fossiliferous slates are followed by a series of beds, con- 

 sisting of alternations of red clay-slate, greenish-gray clay-slate, and quartzite, alto- 

 gether about 1600 feet in thickness without fossils. They are followed by a series of 

 beds about 1000 feet in thickness, consisting of alternations of compact gray quartzite, 

 alternating with a greenish-gray brecciated rock ; near the top are two bands of gray 

 subcrystalline limestone, one of which is 12 feet in thickness. This limestone is rarely 

 fossiliferous, but in some localities it contains stems of encrlnites, imperfect zoophytes, 

 and rarely casts of Orthis sericea. The limestone bands are succeeded by a very re- 

 markable coarse-grained conglomerate, composed of a base of rounded particles of 

 quartz, very closely aggregated togetlier, enclosing rolled masses of granite and com- 

 pact quartz, varying in colour from light gray to reddish brown : some of the rolled 

 masses exceed one foot in diameter, but the average range from four to ten inches in 

 diameter. ,The granite is composed of red felspar, white quartz, and some hornblende, 

 and is similar in composition and external character to the granite of Conuemara, 

 north of Galway Bay. Ascending in the series, tlie pebbles become smaller, and then 

 the rock alternates with greenisli gray, and occasionally purple sLity flags. 



The granitic conglomerate series is of great thickness, probably upwards of 2000 

 feet ; it occurs both on the south and north sides of Killery Harbour. The general dip 

 is to the north, but at Tonatlew, north of the harbour, there is a synclinal axis, which 

 axis forms the highest part of the Silurian series of the district ; as, to the north of it, 

 the conglomerate strata which occur to the south on the borders of Killery Harbour, 

 appear at the surface forming the steep acclivity of Tievaree mountain. Hence it 

 would appear that the entire thickness of the Silurian series in the Killery district 

 amounts to about 9000 feet. But from the fossils discovei-ed, it would appear to be 

 doubtful whether it should be classed with the upper or lower Silurian group, as the 

 Orthis jlahellulum and Orthis sericea of the lower occur abundantly among fossils 

 which are usually considered to be characteristic of the upper Silurian series. 



Mr. Griffith next directed the attention of the Section to the Silurian district on the 

 east coast lately examined, extending througli the counties of Waterford, Wexford, 

 and Wicklow, the greater part of which had previously been considered by him to 

 belong to the older slate series. He observed, that Mr. Weaver in his paper on the 

 east coast of Ireland, published in the Geological Transactions, mentioned that certain 

 fossils had been discovered at Knockmahon on the- coast of Waterford ; subsequently 

 fossils had been discovered by Mr. Griffith, and also by Captain James, R.E., at 

 Tramore Baj', Knockmahon and other localities on the same coast. But the positions 

 in which fossils liad been discovered being confined to the coast, Mr. Griffith had, on 

 bis Geological Map of Ireland, limited the extent of the Silurian series of Waterford 

 to the sea coast. At the meeting of the Association at Cork, Mr. Oldham mentioned 

 that he thought the Silurian series occurred on the coast of Waterford Harbour, both 

 in Waterford and Wexford; in consequence ISlr. Griffith was induced to commence an 

 examination of the slate series, not only on the shores of Waterford Harbour, but 

 extended the investigation tlirougliout the schistose strata of the counties of Wexford 

 and Wicklow ; and in consequence Silurian fossils were discovered in several localities 

 in both of those coimties. In illustration of the succession of the strata, Mr. Griffith 

 exhibited a section extending in a north-western direction from the sienitic granite at 



