484 ON STRATA BETWEEN BORROWDALE SERIES AND CONISTON FLAGS. 



the Upper and the top of the Lower Silurians, whilst in others a 

 real or apparent unconformity occurs. He expressed much surprise 

 at some of the fossils from the Mudstones, and remarked that Tri- 

 nucleus fimbriatus is a true Lower-Silurian form. 



Mr. Etheridge remarked that, as many geologists have worked 

 over the area referred to in the paper, and have differed so much in 

 their results, it is very difficult to come to any definite conclusion. 

 The Mudstones possess a fauna belonging to the Caradoc beds and 

 low down in the Bala series. He agreed with Prof. Hughes that 

 there are more than one series of pale slates. It occurred to him 

 that there must be some mistake in the determination of the species 

 in the Graptolitic Mudstones ; and yet all the interest of the paper 

 hinges upon them. The Coniston Limestones have a well-recognized 

 position. 



