III. — Description of a Series of Longitudinal and Transverse Sections 

 through a Portion of the Carboniferous Chain between Penigent and 

 Kirkby Stephen. 



By the Rev. ADAM SEDGWICK, V.P.G.S. P.R.S. &c. 



(WOODWARDIAN PROFESSOR IN THE UNIVERSITY OF CAMBRIDGE.) 



[Read March 2 and 16, 1831.] 



§ 1. Introduction. 



Having in the preceding communication pointed out some peculiarities in 

 the position of the great central carboniferous chain (which extends from the 

 neighbourhood of Derby to the Scotch Border), with the view of connecting 

 it with the calcareous zone of the Cumbrian mountains ; I now proceed to 

 describe in detail the composition of a very remarkable portion of it, forming 

 a mineralogical link between the High Peak of Derbyshire and the region of 

 Cross Fell. The facts adduced will serve to explain some of the changes the 

 chain undergoes in its range between one extremity and the other ; and will 

 also supersede the necessity of many details respecting the carboniferous zone 

 of the Cumbrian mountains, which once formed, beyond doubt, a continuous 

 part of the same system, and is now only separated from it by the great breaks 

 and dislocations described in the preceding paper. 



The principal section* about to be described, commences at Penigent in 

 Horton parish, and, passing through the highest mountains of the range, 

 ends in the plain of Kirkby Stephen. Two other sections f connect this Hne 

 with the ridge of mountains on the west side of Swaledale. Nearly at right 

 angles to the same line are drawn a series of transverse sections |, prolonged 

 across the breaks connected with the great Craven /«mZ^ They will, I hope, 

 place in a striking point of view some of the internal movements which took 

 place when the chain was elevated, just before the period of the new red 

 sandstone. 



The old red conglomerates do not appear in any part of the longitudinal 

 section, but they are exposed in one of the transverse sections§, and are seen 



* See Plate VI. fig. 2. t Fig. 3. and 4. + Fig. 5. 6. 7. 8. and 9. § Fig. 8. 



