336 PEOCEEDINGS OE THE GEOLOGICAL SOCIETY. [Mar. 7, 



The lowest beds crop out near the hill top, and consist of green and 

 red slates, apparently horizontal or nearly so ; a little farther south 

 red slates and sandstones dip south at 40° and 50°, greenish flags and 

 slates are occasionally interstratified with the red slates, and the dip 

 increases as we go south up to 60° and 70°. Brown sandstones then 

 come in, with red slates between them at first, but very soon with 

 grey slates. Bluish or blackish grey slates he above these, with 

 occasional bands of brown sandstones and grey grit, the dip being 

 steady at 50° and 60° to the south. The cleavage in the slates is 

 also very steady dipping N. 20° W. at 80° or 85°. Grey slates are 

 seen down to the road, a little south of which, crags of grey crinoidal 

 limestone appear. This limestone itself is also much cleaved, so that 

 the bedding is not determinable with any certainty. 



Immediately south of this the grey slates rise out again at an angle 

 of 30°, and are then much contorted, as may be seen in several small 

 quarries and cuttings, but still better in the little ravine which the 

 river has cut near Ballea Castle, on its way from this patch of lime- 

 stone to the western termination of that of Carrigaline. The cleavage 

 here also dips steadily north-north-west at 80°, through all the 

 numerous contortions of the beds. 



The thickness of the Carboniferous Limestone here cannot be very 

 great, perhaps 200 feet at a maximum. That of the Carboniferous 

 slate and grit is apparently about 1500 feet, while the Old E-ed 

 Sandstone is exposed to a depth of 4000 or 5000 feet, the lowest 

 beds being bright-red slates. 



The fossils found in the Limestone near Ballea comprise jLmpleocus 

 coralloides, Spirifera pinguis, S. striata, JStreptorhynchus crenistria, 

 Actinocrinus variabilis, and other common Carboniferous fossils. 

 There are several fossil localities in the Carboniferous slate of this 

 neighbourhood, from one or other of which the following species 

 have been collected, the specific determinations being made by Mr. 

 W. H. Baily. 



Plants. Filicites lineatus (" linear plants "). 



CcELENTERATA. CyathopTiyllum (Petraia) celticum ; Pleurodictyum 

 prohlematicum^ , 



PoLYzoA. Ceriopora rhomhifera ; Fenestella antiqua. 



Brachiopoda. Athyris ambigua ; Orthis Michelini ; Producta sca- 

 bricula ; Henssellceria stringiceps ? ; Rhynchonella pleurodon ; 

 JSpirifera cuspidata,S. striata, S. Yerneuillii (S. disjuncta); Spiri- 

 ferina cristata, var., octoplicata ; Terebratula hastata. 



CoNCHiFERA. Avicula Damnoniensis ; Cucullcea Hardingii, (includ- 

 ing the varieties amygdalina and trapezium) ; Curtonotus elegans 



* This was long familiarly known to us on the Survey under the name of the 

 " Belgooly Coral." Its identification with Vleurodictyiim problematicum depends 

 on Mr. W. H, Baily's authority. Doubts of the correctness of that identifica- 

 tion having been expressed by Mr. Salter and others, Mr. Baily has re-investi- 

 gated it, and still holds by his opinion that it is either that identical form, or 

 one very closely allied to it. As it is now believed to be the mere cast of another 

 coral, minor variations in the form are to be expected. Whatever it be, it is 

 beyond all doubt identical with specimens from Braunton in North Devonshire. 



