Vol. 62, ,] AN UNCONFORMITY IN THE COAL-MEASTJEES. 



.549 



Another point worth noting is that the more marked prominences 

 of surface" of the Lower Series are invariably those which bear the 

 strongest marks of disturbance. 



As regards the evidence for the direction followed by the thrusting 

 movement, the chief points have already been mentioned. To 

 these it may be added that the direction of tbe minor thrusts in 

 the Upper Series (see PL XLII) is clearly from south to north ; 



pig. ig. — Photograph showing the direction of the thrust. A=.shale, 

 wedged from south to north into the underlying sandstone (B). 



that the small faults transverse to the general line of section are 

 east-and-west faults ; and generally that the orientation of disturbed 

 shale-fragments, the motion of which has been arrested by harder 

 beds, also indicates movement from the south (see fig. 16, above). 



Fig. 17. — General section from A to N. 



N.W. 



The action of the thrust is markedly rhythmical, short stretches 

 of highly-disturbed beds alternating with others in which the dip is 

 gentle (see the general section, fig. 17). With the latter disposition, 

 Q. J. G. S. No. 247. p 



