98 Prof. Sedgwick on the Carboniferous Chain 



bare hills called the Clouds*,, and thence to the greywacke chain of Raven- 

 stonedale. The phenomena are here less complex than in the preceding 

 section^ though the dislocated beds have undergone a greater movement of 

 elevation. 



The top of Wild Boar Fell is chiefly composed of the second millstone grit 

 (General Section No. 13.), and along the descending line we cross all the 

 groups to the four-fathom limestone (No. 9.). The line of the great fault 

 crosses the section in a deep morass very near the outcrop of the last-men- 

 tioned group (No. 9.) ; and at a very short distance the highly inclined beds 

 of the Scar limestone rise into the bare hills, called the Clouds, and are con- 

 tinued (sometimes in a vertical position and sometimes contorted) to the rivulet 

 where they are cut off by the greywacke chain. 



It is possible that some of the groups above the Scar limestone may be con- 

 cealed among the dislocated masses under the morass : but it is at least evident, 

 that a portion of the Scar limestone has been broken off from the bottom of the 

 carboniferous system, and lifted up to its present position over the edges of 

 all the groups of the general section from No. 2. to No. 8. inclusive. 



The first and second of these five transverse sections (Fig. 5. & 6.) connect 

 the facts described in this paper with those already published by Mr. Phillips f; 

 and the last three sections (Fig. 7. 8. & 9.) show the very complex nature of 

 the movements along the line of fault, where it ranges close to the junction 

 of the carboniferous and greywacke chains. — By combining these details with 

 those given at the end of the preceding paper, "On the general Structure of 

 the Cumbrian Mountains, &c.&c.";{; we shall have a sufficiently minute account 

 of the whole northern range of the great Craven fault, and of the structure 

 of the neighbouring carboniferous chain. 



§ 5. Conclusion. 



1. I will not repeat what I have so recently stated on the changes of 

 the carboniferous system in its range from Derbyshire to the valley of the 

 Tweed§: but I may observe, that the region above described seems by its 

 structure to form a natural link between the northern and southern portions 

 of the chain. 



* The hills are probably so called from the light grey colour of the dislocated rocks of Scar 

 limestone. 



■f Geol. Trans., Second Series, vol. iii. pp. 12. and 9. ;}; Supra, p. 60. 



§ See Anniversary Address, Feb. 18, 1831. Proceedings of the Geological Society, No. 20. 

 p. 286—288.^ 



