Smyth — Faunal Zones of Rush- Skerries Carboniferous Section. 537 



In 1906 Dr. Vaughan proposed the following correlation for the rocks at 

 the southern end of the section' : — 



Kate Limestones, . . . . . S (? 83) 



gap. 

 Carlyan Limestones, . . . . . S (? Si) 



Supra-Conglomerate Limestones, 



Rush Conglomerate Group, 

 Passage Beds, 

 Eash Slates. 



In 1908, when dealing with the northern end of the section, doubt was 

 thrown on the foregoing, and the following suggestions were made^ : — ■ 



Holmpatrick Limestone, 180 ft. \ ? Carlyan Limestone. 



?D of 

 Lane Conglomerate, . 200 ft. l unknown ? Rush Conglomerate Group. 



position. 

 Lane Limestones, . 60 ft. / ? Rush Slates (top part only). 



The position of the Rush Slates and Conglomerates is reconsidered in this 

 paper, and the position is summed up as follows^ : — " The broad resemblance 

 to a Zj - C - Si sequence is not confirmed by identity of detail. On the 

 other hand, the evidence for a D horizon is far from conclusive, and the 

 failure to find an unquestionably Visean form in the whole thickness of the 

 Zaphrentis slates is without parallel in fossiliferous D beds. The final solution 

 of the question of level must await fresh evidence." 



From a consideration of the Olitheroe district in Lancashire Dr. Vaughan 

 got some confirmation of his first correlation, and in August, 1911, referred 

 to a clearing up of difficulties with regard to the position of the Rush Slates 

 and Conglomerates and the Carlyan Limestone.* 



This, however, he now considers was premature, and in December, 1912, 



' Quart. Jouni. Geol. Soc, vol. Ixii, 1906, p. 279. 



* Quart. Journ. Geol. Soc, vol. Ixlv, 1908, p. 434. 

 ^ loo. cit., p. 442. 



* Quart. Journ. Geol. Soc, vol. Ixvii, 1911, p. 381, foot-note. 



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