﻿Yol. 64.] THE CARBOl^IFEROUS EOCKS AT LOUGHSHINNY. 413 



-24. The Caeboniferous Rocks at Loughshinny (County Dublin). 

 By Chaeles Alfeed Matley, D.Sc, F.G.S. With an Account 

 of the Faunal Succession and Coreelation. By Aethur 

 Vaug.han, B.A., D.Sc, P.G.S. (Bead March 18th, 1908.) 



[Plates XLIX & L— Fossils.] 



Contents. 



Page 



I. Introduction 413 



II. Description of the Rocks 415 



(A) Brook's End to Loughshinny Bay {Cyathaxonia-'BQdiS). 



(B) Loughshinny Bay to Limekiln Cove {Fosidonomya-Lixn.Q^toneB 



and Loughshinny Black Shales). 



(C) Dibunopht/llum-Jjhnestones, north of Limekiln Cove. 



(D) Lane Conglomerate, with its Lhider- and Overlying Lime- 



stones. 



III. Sequence of Deposits in the Loughshinny Area 433 



IV. Conditions of Deposition in the Rush-Loughshinny Area 434 



V. Summary and Conclusion , 436 



VI. Faunal Succession and Correlation 436 



VII. Notes on the Species figured in the Plates, and on some other 



Important Forms 454 



I. Inteoduction. [C. a. M.] 



Loughshinny, a tiny fishing-village on the coast of County 

 Dublin, about midway between the larger villages of Eush and 

 Skerries, is well known to Dublin geologists for the fine exposures 

 of contorted strata exhibited in the neighbouring cliffs. These 

 exposures form part of an extensive coast-section of Carboniferous 

 rocks which may be followed, with a few interruptions, for about 

 5 miles from Bush on the south to Skerries on the north. 



A description of the rocks in the southern portion of this coast - 

 section, from E-ush as far north as a small cove called Brook's End, 

 was given by us in 1905,^ together with an account of the faunal 

 succession and correlation of the beds. The present paper con- 

 tinues the description northward from Brook's End, and is intended 

 to be read in conjunction with our previous paper. The references 

 given to former literature and maps in that paper apply equally 

 to the ground now to be described. 



Before, however, describing in some detail the rocks around 

 Loughshinny, it seems desirable to recapitulate very briefly the 

 sequence of the rocks in the Rush portion of the coast-section. At 

 Eush the lowest beds are a thick mass of dark slates (Eush Slates), 

 with intercalated limestone-bands; they pass up into the Eush 

 Conglomerates, and the latter into a calcareous group (Supra- 

 Conglomerate Limestones and Carlyan Limestones). The ascending 

 succession is as a whole from south to north, and the beds mentioned 



Quart. Journ. Geol. Soc. vol. Ixii (1906) pp. 275-322. 



