Vol. 68.] AND CAMBRIAN INLIEE AT PEDWARDINB. 373 



lithological differences from the Pedwardine grits and conglomerates » 

 He did not regard the unaltered condition of the Dictyonema Shales 

 as affording any evidence against the occurrence of a large thrust 

 above them, since it has often been noticed in other areas that the 

 rocks below a thrust-plane may not be affected to any great extent. 

 With regard to the eastward displacement caused by such a thrust, 

 it should be noted that the Longmyndian beds of Pedwardine lie 

 considerably to the east of the strike-line of the corresponding beds 

 of the main Longmynd area. He did not consider the absence of 

 matrix from the Bala grits to be a character of any importance in 

 correlation, since the thickness of such beds was so small and the 

 rocks lay so near the surface. He agreed that excavations were 

 needed to clear up certain points, but he had no opportunity of 

 undertaking them at the time of his investigation of the district. 

 In conclusion, he thanked the President and Pellows for the kind 

 reception given to his paper. 



