696 



MR. J. E. MIER AXD DR. H. A. NICHOLSON 



Monograptus distans, Portl., and the accompanying fossils, and is 

 succeeded by 



Ac 4. The Acidaspis-erinaceus mudstones, 10 feet thick, and 

 passing up into the Browgill Beds above. The latter are difficult of 

 access, and we were unable to work them in detail. 



"We have not collected carefully from the beds of this section, as 

 they are much cleaved, and the fossils are very indifferent ; we 

 merely obtained sufficient to satisfy ourselves of the identity of the 

 beds, and did not work the Trilobite-bearing mudstones at aU for 

 fossils; indeed, with the exception of one or two cases, we have 

 left these latter untouched, knowing the time required, as a general 

 rule, to extract any fossil remains from these comparatively barren 

 bands, and knowing also that the identification of the Graptolitic 

 zones above and below each mudstone band is sufficient to fix the 

 position of the mudstone. 



It has been stated that the strike-fault increases in intensity 

 towards the south-west ; and just below Appletree worth Farm the 

 disturbance has been so great as to produce the remarkable section 

 seen in fig. 10. 



Pig. 10. — Section of Far in, Appletreeworth Beck. 

 (Scale about 200 feet to 1 inch.) 



N.E 



V^X^C'v 



3 



•sa 



m 



§i3 



i 



o 



o 



/-A-N 



^ 



s.w. 



Browgill 

 Beds. 



We have here a faulted synclinal of Skelgill Beds brought beneath 

 the Coniston Limestone by a fault which is shown, by the way in 

 which it crosses the beck, to have a reversed hade. "We would 

 suggest that the fold which here brings up the Coniston Limestone 

 has decreased to such an extent higher up the gill that there it only 

 affects the Lower Skelgill Beds, repeating them upon themselves, a 

 supposition for which we have given other evidence. If this is 

 really the case, and the facts favour it strongly, the great apparent 

 thickness of the Lower SkelgiU Beds in Yewdale Beck and other 

 sections is illusory. 



The syncline of SkelgiU Beds rapidly dies out to the south, as 

 does the Coniston-Limestone anticline to the north, and the main 

 outcrop of the Skelgill Beds proceeds to the south-west in a line 



