1846.] SEDGWICK ON THE SLATE ROCKS OF CUMBERLAND, ETC. 123 



in a general way, both by Mr. Sharpe and myself, with the Lower 

 Ludlow rocks. It forms a part of his Windermere rocks. 



I formerly considered the three lower sub-groups (4 cr, 4 /3, 4 -y) 

 as Lower Silurian ; but I did so before I had re-examined the 

 country (the most important part of which I had never seen since 

 1822), and I was, I believe, misled by confounding the High Haume 

 limestone (south of the Duddon) with the upper calcareous band 

 (4 /3). I need not repeat what I have before stated on this head ; 

 but as Mr. Sharpe still appears to adhere to the supposition that these 

 three lower sub-groups are Lower Silurian, I have lately re-exa- 

 mined my fossil evidence, as well as my field sections ; and I adhere 

 to my previous conclusions. In the first place, there is no evidence 

 of any unconformable overlap (as stated, if I mistake not, in Mr. 

 Sharpe's paper,) among the beds of the four sub-groups, and they 

 form one unbroken continuous mass. And in the second place, the 

 fossils of the four sub-groups compel us to class them all as one 

 formation — nearly on the parallel of the Lower Ludlow rocks. 

 The fossils of the rocks north of the Ferry House at Windermere 

 have been re-examined by my friend Mr. Salter ; several large fos- 

 siliferous masses which I brought away from these rocks have now 

 been broken up, and the following is the list of fossils Mr. Salter 

 has derived from them. 



List of Fossils from the Rocks north-east of the Ferry House. 



1. Encrinites, one or two species. One remarkable undescribed 



species also found in the valley of the Kent above Kendal, 

 just under the Upper Ludlow rocks. 



2. Fragments of a Calymene, 



3. Turbo carinatus or corallii. 



Turbo ? like a species in the Upper Ludlow of Kirkby Moor. 

 Turritella obsoleta. 



Terebratula semisulcata (^T. lacunosa of the Ludlow rock in 



the ' Silurian System '). 

 Orthis orbicularis. 



luiiata. 



Leptmna lata. 



Nucula, resembling N. ovata. 



Here are twelve species — none of which are known Lower Silurian, 

 and eight of which are known Upper Silurian species. And to this 

 list we may add Terebratula navicula, obtained from the immediate 

 neighbourhood. It appears therefore that there is no room for 

 doubt ; for these fossils are all derived from the loiuer part of the 

 great group (No. 4). 



It was however stated tliat the upper limestone, near Coniston 

 Water-foot, contained Lower Silurian fossils ; and the authority of 

 Mr. J. Marshall was appealed to. Now I examined this part of the 

 country during last summer in company with Mr. J. Marshall, and 

 I venture to affirm that he did not show me a single Lower Silurian 



