1846.] SEDGWICK OK THE SLATE ROCKS OF CUMBERLAND, ETC. 121 



14. Section from the higher part of the Valley of Sedbergh, over Cautley Fells to 

 Ravenstonedale. 



Great Craven Fault. 



8. Limestone shale overlaid by millstone grit. 



7. Mountain limestone broken by the Craven fault. 



4. Contorted slates, &c., ending with old red (6) and mountain limestone of Ravenstonedale*. 



3. Hard grits. 



2. Flagstone with Graptolites : — Orthoceratite with an encrusting coral. 



1. Calcareous slates and limestone with fossils. A little above the line are many porphyry 

 dj'kes, and farther on the strike of the same beds, a magnificent series of Coniston fossils, perhaps 

 the richest deposit of this age in the north of England. 



These are instructive sections, and tell a very plain story. They 

 enable us also to interpret other sections, which might be considered 

 doubtful and obscure without their help. 



15. Great North and South Section from Tebay to Casterton Fell. 



Casterton S. 

 Fell. 



From this section it appears that the Coniston grits (3) and Ire- 

 leth slates (4) are repeated by great undulations. In one spot the 

 calcareous flag (No. 2) (with Graptolites ludensis) makes its appear- 

 ance ; and the whole series at the north end is overlaid by old red 

 conglomerate (6) and mountain limestone (7). 



In the grits (No. 3) of Casterton Fell are Orthoceratites suhundu- 

 latus, O. Ibex, and Cardiola interrupta. 



In the slates of Middleton Fell and Howgill Fell (No. 4) are 

 Avicula, a small species; Orthoceratites subundulatus, a coral re- 

 sembling Monticularia and Alveolites fibrosa. 



l6. Great connecting Section from the Shap Granite to Baugh Fell above Sedbergh. 



4. Ireleth slate series. 



3. Coniston grit. 



2. Coniston flag much indurated near the gi-anite. 



A. Shap granite throwing veins into No. 2. 



* At the end of the slate series (4) in Ravenstonedale Calymene {Downingim ?) 

 occurs. 



