﻿52 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Dec. 4, 



Anthracite, i 

 1st band. J 



Fault 



Anthracite, 1 

 2nd band. I 

 Fault 



Anthracite, ' 

 3rd band, 

 and Fault. . 



Hartfell Burn. 



Moffat Well Burn. 



French! and Burn. 1—1 



Moffat Water. 



Bell Craig Burn. 



Wamphray Water. 



r 



5s- 



indicates that these tra- 

 verse the Silurians at short 

 distances from each other, 

 the result of a repeated 

 throwing-down of the 

 strata in a N.N. W. direc- 

 tion. The effect of these 

 faults has been to bring 

 up at intervals the anthra- 

 cite beds and the graptolite 

 shales ; the consequence 

 being a repetition of the 

 same beds in three parallel 

 bands, as we have before 

 seen. 



In some cases the lines 

 of fault appear to run im- 

 mediately through parts of 

 the anthracite beds, for we 

 find these so affected as to 

 show that they have been 

 contiguous to the forces 

 which produced the up- 

 heaval and depression of 

 the strata; this is indicated 

 by the flexures which the 

 anthracite suffers, and the 

 slickensided character of 

 the dark-coloured shales. 

 Many other faults, how- 

 ever, seem to occur which 

 have not exposed the fos- 

 siliferous portion of this 

 part of the Silurians. 

 These are shown by the 

 polished appearance which 

 some of the faces of the 

 finer beds of greywacke 

 present, and which in some 

 localities, more particularly 

 when metamorphic action 

 has been at work, have 

 produced upon the faces 

 of the rocks a black bur- 

 nished aspect, similar to 

 what would have resulted 

 from the polishing of any 

 smooth surface with plumbago. In the case of the more indurated 

 rocks, these faults seem in general to have caused a sliding action of 

 the strata along the planes of the beds, rather than a general break- 



Dryfe Water. 



Dalton Hook. 



Nutholm Hill. 



Annan River. 



1 



CIS 5 



Kelhead. 



Glen Stewart. 



Solway Firth. 



