496 Proceedings of the Royal Irish Academy. 



Geeat East anb "West Fault. 



Salroch. — Eecl slates (Upper Llandovery fossils). 

 Upper Lough Much Beds. — LlandoYeiy and Wenlock fossils). 

 Loioer Lough Much Beds. — (Caradoc-Bala fossils). 

 Gowlaun Beds. — (Llandovery and "Wenlock fossils). 



As to the Dingle promontory, Co. Kerry, although outside the pro- 

 vince of the inquiry, it was pointed out that the rocks were both of 

 the "grey and green" and of the " Lower Old Red Sandstone" types, 

 and that in the Anascaid beds there are fossils of Caradoc-Bala spe- 

 cies.^ Of the other groups, the Smerwich heds, which are strati- 

 graphically the oldest of the continuous sequence, are of '' Lower Old 

 B,ed Sandstone" type, and unfossiliferous ; while above them are the 

 grey and green fossiliferous Ferriter^s Cove series, and, higher up, the 

 Croagh Marhin series, which are a combination of both types ; some 

 beds being light-coloured and fossiliferous, the fossils being for the 

 most part of Ludlow species, while over all come the typical reddish 

 arenaceous Dingle beds. 



A resume in the original Report gave the relations between the 

 different areas of the Silurian and underlying rocks. 



An Epitome of the Results or the Ijstquiet. 



Relations hetioeen the Silurian ("Lower Old Red Sandstone") and the 

 underlying and overlying Strata. 



Pomeroy. — In this immediate neighbourhood the rocks of the 

 "Red arenaceous" type seem to lie unconformably on the rocks of 

 the " Pomeroy series " (Cambro-Silurian), which they seem to overlap; 

 north-westward, the rocks adjoining them are metamorphosed Cam- 

 brians ; and southward they are overlain unconformably by Carbo- 

 niferous sandstones. 



Six-mile- Cross. — To the I^. E. of this village, about a mile JN^. W. 

 of Carrickmore, the Lower Old Red Sandstone lies against granite 

 rocks of Silurian age ; while about two miles S. W. of Carrickmore, 

 in the valley of the Camowen river, there appears to be under them 

 an outlying mass of rocks of the " Pomeroy series." Some of these 

 "Lower Old Red Sandstones" are of the " Red arenaceous" type, in 

 which there are subordinate limestones and greater or less thick- 



^ Jukes and Du Noyer have classed these beds as Silurians : but after more 

 recent research we are informed by Mr. M'^Henry that he suspects that they 

 ought to be classed as Cambro- Silurians ; this was also Griffith's classification, 

 but solely on fossil evidence. 



