472 R. HARKNESS AND H. A. NICHOLSON ON THE STRATA BETWEEN 



Fig. 3. — Diagram showing the vertical Succession of the Silurian 

 Strata in Slelgill BecJc, near Ambleside. 



Base of the Coniston Flags (Broughton- 

 Moor Flags), with Monograpfus colo- 

 nics, Retiolites Geinitzianus, &c. 



Knock beds. Greenish slates with den- 

 drites, casts of a small Orthis, &c. 



a 



Graptolitic Mudstones, with numerous 

 Graptolites and other fossils. At a is 

 the lowest Graptolitic band resting 

 directly upon the limestone ; and 

 immediately above it (b) is a grey 

 band full of Brachiopods. 



a. ii ''-.j 11 n ii r 

 I) L. 



I) if (I If I) I) II II 



ii ii 



X-IiJL 



ii 



Coniston Limestome proper, consisting of 

 shales alternating with bands of lime- 

 stone and layers of calcareous concre- 

 tions. The shales are highly fossili- 

 ferous. 







i 



h 



<^ 



Summit of the Borrowdale series, c is a 

 thin band of ashes representing the 

 Style-End Gi-assing beds. It is full 

 of spots of peroxide of iron and rusty 

 cavities, apparently due to the decom- 

 position of fossils. 



