"Vol. 65.] HOCKS OP THE TOURMAKEADY DISTRICT. 119 



recemented by the deposition of material in the cracks. This type 

 of limestone, which has not yielded any fossils, contains, occasionally, 

 scattered angular masses of red or green chert. 



(3) Limestone-brecci a. — Two main types of these rocks seem 

 to be recognizable : — 



(a) A coarse type which contains angular blocks of limestone, 

 red, pink, or grey in colour and horny or crystalline in texture, 

 intermingled with angular blocks of red and green felsite. The 

 matrix in which these blocks are embedded is generally in a very 

 much weathered state, but, when fresh, is found to be a calcareous 

 ashy grit, closely resembling that in which near Gortbunacullin and 

 elsewhere Llandeilo fossils have been found. The blocks measure 

 occasionally as much as 18 inches across, but more usually about 

 4 or G inches. We have found no fossils in the matrix, although 

 some of the included limestone-blocks have yielded a rich harvest 

 of fossils. 



(b) A finer type showing often a distinct stratification, and 

 consisting principally of small pieces of limestone of various sizes 

 up to 1 inch across, and of less numerous fragments of felsite and 

 red chert, embedded in a relatively scanty matrix of the nature of 

 a calcareous grit. 



Description of the exposures of the Tourmakeady 

 Beds. — (1) The southernmost exposure is about 300 yards north- 

 east of Tourmakeady Lodge. It is in a wood, and the relations of 

 the rock to the surrounding beds are entirely obscured. Both the 

 types of breccia are seen here. 



(2) Immediately west of the Smithy bridge are several small 

 exposures of coarse and fine breccia, perhaps parts of a continuous 

 strip. 



(3) Some 200 yards east-south-east of the same bridge is a small 

 patch of limestone-breccia, closely associated with a breccia com- 

 posed of felsite. This is the only exposure of the calcareous series 

 seen on the eastern side of the red felsite. 



(4) South of Gortanalderg is a patch of limestone-breccia of 

 the coarse type, and associated with it is a breccia formed of 

 felsite-fragments. The occurrence of crushed material on the north 

 points to the presence of a fault separating it from the felsite. 



(5) About 300 yards south-east of the last-described exposure is 

 a small one, showing both coarse and fine types of limestone-breccia, 

 with fine gritty ashes immediately beneath. The limestone frag- 

 ments are of various sizes up to 4 inches across. Small felsite- 

 fragments are also very numerous. 



(6) West of Gortanalderg a strip of limestone, about 400 yards 

 long, extends from the stream through some fields as far as the road 

 coming from the village. The rock here is not a breccia formed of 

 limestone-fragments embedded in a more or less ashy matrix, but 

 a well-bedded grey and pink limestone, which, though often much 



