582 [March 12 ■ 



This group may be traced to Shap Fells and Bretherdale, 

 parallel to the lower beds ; and in the hills composed of it on the 

 sides of Kentmere, Long Sleddale, &c., several fossils were obtained, 

 of which the following is a list : — 



Leptaena lata. North end of Potter's Fell, Helme Park, &c., Underbarrow. 

 Orthis lunata. Ditto Ditto. 



Spirifer ? (S. octopllcatus of Mr. Sharpe's paper.) Ditto. 



Terebratula navicula (plenty). Ditto ditto. 



Avicula retroflexa. Ditto ditto. 



Cornulites sei-pulariiis. Ditto ditto. 



Turritella conica. Underbarrow. 

 Ophiura n. sp. Potter's Fell. 



Orthoceras ibex. Helme Park, &c., Howgill. j 



&c. &c. &c. 



5. Group of coarse Slates, Flags, Grits, Sfc. — The author has 

 already noticed this group as a coarse development of the Ireleth 

 slates, and the beds have been named by Mr. Sharpe, Windermere 

 rocks. They are so far important that they are of great thickness, 

 and pass downwards into the Ireleth slates. Upwards, they blend 

 themselves insensibly with the sixth group ; the singular slates, 

 grits, and flagstones which commence a few miles north of Kendal, 

 and continue southwards over the moors as far as Kirby Lonsdale, 

 ending in red slaty beds like the tilestone of Shropshire, the geo- 

 logical place of which these slaty beds occupy. 



The group now under consideration is greatly broken and 

 shattered by faults, but no part of it can be considered non- 

 fossiliferous, as the author found Cardiola interrupta in the very 

 heart of it, and fragments of encrinites elsewhere. 



The author is not aware of any evidence of want of conformity 

 between the beds of this group and the other masses. 



6th Group, nearly on the parallel of the Upper Ludlow. 



The author is inclined to place the base of this group near 

 Underbarrow, whence to the limestone of Kendal Fell there is a 

 magnificent section. The fossils are very numerous, and some are 

 peculiar to the neighbourhood. Terebratula navicula is only 

 found in the lower part, but the whole upper part is full of fossils, 

 the prevailing type being Upper Ludlow, although amongst these 

 beds is a remarkable band with Asterias. 



A great downcast fault in the valley of the Kent affects these 

 beds, and on its south side is seen the " tilestone," separated from 

 the other rocks by singular calcareous shales. 



The siliceous, flaggy, and gritty beds of the Upper Ludlow are 

 then carried with many breaks and undulations to the valley of 

 the Lune, where they are overlaid by a thick mass of tilestone. 



The uppermost beds of this tilestone are full of fossils, all of 

 Upper Silurian species ; and there is, in the opinion of the author, 

 no true passage from the tilestone to the overlying old red sand- 

 stone.* 



* The author's opinion seems to be grounded on the three following facts : — 

 (1.) As a general rule the conglomerates of the old red sandstone are perfectly 

 unconformable to the upper slates of Westmoreland : of this there are many un- 

 doubted examples. 



