44 



PROCEEDINGS OF THE GEOLOGICAL, SOCIETY. [DeC. 3, 



A great spur of the Scar Limestone runs down from Whernside to 

 the scar above Twisleton, forming the separation between Chapel le 

 Dale and Kingsdale. The Thornton section (fig. 3) begins at the 



Fig. 3. — Section from Ingleton to Thornton Force. 



Distance about 2 miles. N, 



4'. Carboniferous grits. 



6. Great Scar-limestone. 



7, Old Red [the thickness of this calcareous conglomerate is exaggerated in this Section]. 



d. Calcareous slate, here and there passing into concretionary limestone, ( = Coniston limestone). 



e. Greenish slates, alternating with very hard greenish-grey beds of gritstone, provinc. Calliard, 



(=Chloritic Slates of Cumberland and Westmoreland, underlying the Coniston limestone). 



N.N.E 



Fig. 4. — Section from Twisleton Scar to 

 Distance about 3 miles. 



Slate 

 quarry. 



Trap-dykes. 



JOV^Wj»M^-^ 



s.s.w. 



Black Burton 

 Coal-field. 



4'. Carboniferous grits, 



6. Great Scar-limestone. 



7. Old Red Conglomerate. 



d. Calcareous slate with Orthis Actonice, &c. (as in fig. 3), penetrated by two veins of felspathic 



rock [much exaggerated in the Section] . 



e. Greenish slate (as in fig. 3). 



foot of Kingsdale, crosses the Craven fault, and then passes, over the 

 dislocated limestone, to the beds which are prolonged into the Black 

 Burton coal-field. The Ingleton Beck section (fig. 4) crosses the 

 same groups of strata ; and, if pictorially represented, would show a 

 deep gorge cutting through the slate-quarries. In fact, the section 

 descends from the great Scar Limestone to the slate-quarries on the 

 west side of the rivulet ; but the quarries cross the rivulet, and the 

 section is then taken up (at about a hundred yards distance) on the 

 opposite side, and so taken down to Ingleton, on a nearly parallel 

 line. There is, however, no ambiguity whatsoever in the order of 

 superposition, which is correctly given in the section (fig. 4). The 

 dips are the same in the two sections under notice *, but they are 

 represented, as they are seen in nature, from opposite points of view. 

 (1.) At the north end of the two sections the Scar-hmestone is 

 nearly horizontal, and the upper surface of the slate groups has been 

 worn down to a nearly horizontal surface. 



* The mean dip being about S.W. or S.W. by S., and at a great angle. 



