1866.] JUKES OLD EED SANDSTONE AND DEVONIAN. 323 



the other side of the road. This Cambrian crag evidently stood as a 

 rock in the Carboniferous sea, and pebbles derived from it were em- 

 bedded in the limestone formed in that sea, and if there be any Old 

 Ked Sandstone about it, it is overlapped and concealed by the lime- 

 stone. A mile farther to the south-west, however, about Latimers 

 Town, there appears to be a district of red and yeUow sandstone and 

 conglomerate interposed between the Cambrian ground and that in 

 which the limestone is found. A little farther on, quarries in red 

 and yellow sandstone occur, and a regular band of red and yellow 

 sandstone and conglomerate then runs to the south-west until it 

 terminates on the sea-coast. The best section may be seen at Dun- 

 cormick, about twelve miles south-west of Wexford, of which fig. 1 



Fig. 1. — Section at Dimcormick, 



Seafield House. Duncormick. N.W. 



c a 



Length of Section, three-quarters of a mile. 



Carboniferous Limestone. c. Old Eed Sandstone. a. Cambrian rocks. 



is a sketch. Several quarries were opened here in a dark-grey flaggy 

 and shaly limestone, very fossiliferous and highly fetid, which dipped 

 to the south-east at 25°. These lay between Seafield and Duncor- 

 mick, which latter village stands on red flaggy sandstones and red 

 shales, underneath which are yellow sandstones and conglomerates, 

 all dipping south-east at 25°. These beds are well exposed in the 

 village and road. North-west of the village, on the other side of the 

 road, green grits and slates, such as are seen everywhere in the Cam- 

 brian rocks of the Forth Barony, rise to the surface, undulating in 

 different directions and at various angles. The thickness of the 

 yeUow and red rocks here is about 200 feet, while the limestone beds 

 must have a total thickness of 600 or 700 feet, if the dip of the beds 

 is the same in the concealed parts between the quarries, as it is where 

 they are open. "We have taken the beds of red and yellow sandstone 

 and conglomerate thus described, for Old Eed Sandstone. There are, 

 however, other beds of similar red sandstones and conglomerates to 

 be found to the south-east of this band, interstratified with the Car- 

 boniferous Limestone, and therefore certainly not true Old Red Sand- 

 stone. This is a circumstance which occurs also in the northern por- 

 tion of Ireland, as also I believe in parts of England, so that the 

 mere occurence of red sandstones and conglomerates beneath some 

 beds of Carboniferous Limestone is not sufficient to entitle them to 

 be considered reaUy Old Eed Sandstone. 



a. Red Sandstones and Conglomerates in the Lower Silurian Rocks. 

 — Thick masses of red shale and red sandstones and conglomerates 

 are interstratified also with the Lower Silurian rocks of Wexford 

 near Tagoat, and Waterford near Bunmahon. Those of Bunmahon 

 were at first presumed to be Old Eed Sandstone let in by faults 



