34 



though in parts slightly disturbed by trap dykes, dip pretty 

 uniformly at a slight angle seaward, those beds farthest out being 

 the newest. 



" The occurrence of magnesian limestone in the vicinity of 

 Cultra has for many years been a subject of interest to Irish 

 geologists. Dr. Bryce, F.G.S., in 1835, first drew attention to 

 these strata in a paper read before the Geological Society of 

 Dublin, in which he stated that they were dolomitic, and should 

 be considered of Permian age ; and this view has since been 

 adopted by all who have written on the subject. 



" In one of the recently published Memoirs of the Geological 

 Survey of Ireland, full details are given of these beds by Messrs. 

 Hull and Warren f and Mr. Baily, under " Palaeontological Re- 

 marks," records the following Permian fossils as occurring at the 

 station, viz. : — Productus horridus, Bakewellia antiqua, Schizodus 

 Schlotheimi, Area, like tumida, Turbo helicinus. 



" I have no remarks to make on these fossils, not having seen the 

 Survey collection, but all those found by me in the beds are 

 referable to Carboniferous species, viz. : — Orthoceras incequiseptum, 

 Loxonema sulcatula, Cypricardia sifiuata, Lithodendron junceum, 

 Spirorbis globosus. 



"The summer of 1870 was spent at Cultra, and, while there, 

 many fossils were found by me in the shales and limestones 

 exposed along the shore, which had not been previously known 

 from this station, and the facts brought to light during this 

 investigation led me to question the received views regarding the 

 age of some of the beds. 



* There is a slight discrepancy between the general description of Messrs. 

 Hull and Warren (p. n), and the detailed description by Mr. Warren (p. 20). 

 In the former, the dolomite and red marls (Permian) are made to rest on thin 

 bedded fossiliferous limestone, of Carboniferous age ; while Mr. Warren, in the 

 detailed description, includes all these beds as Permian. The special report by 

 Mr. Warren may be considered the correct one. It agrees best with the 

 colouring as laid down on the Geological Survey Map (sheet 29) ; besides, the 

 thin bedded limestones are the only fossiliferous strata to be met with in these 

 so-called Permian rocks. — (See Memoirs of the Geological Survey, to accom- 

 pany sheets 37, 38, and part of 29. ) 



