DISLOCATIONS AND REVERSED STRATA— ABBERLEY. 



421 



a. Coal-grits, &c. h. Lower g. Aymestry /. Upper 



Ludlow. Limestone. Ludlow. 



When examined in detail, the underlying beds (/) are seen to consist of the Upper, 

 and the overlying Qi) of the Lower Ludlow rock, the inclination exceeding the vertical 

 by about 20°. Grits of the coal-measures (a) adhere in broken patches to the side of 

 the elevated mass, and small troughs of coal have been worked out in the depressions 

 on the eastern side of the ridge, thus teaching us, that one, if not the chief dislocation, 

 was posterior to the coal measures. 



From this point, the Ludlow formation is clearly exhibited in the reversed order of 

 superposition for about four miles ; the angle of reversed dip increasing as the ridge 

 advances to the south. On the sides of the hills there are various natural sections of 

 the Ludlow rocks dipping at angles of 30° to 40° to the east, whilst the Old Red Sand- 

 stone occupies the valley below this escarpment of inverted strata. (See Section, PI. 36. 

 f. 4.) The proofs of these inversions are completed by prolonging a transverse section 

 to the east, and the parallel ridge of Wenlock limestone is found to be also tilted over ; 

 the beds, with partial exceptions of curvature, conformably overlying those of the 

 younger formation, and at angles varying from 45° to 60°. So symmetrical indeed is 

 the reversal in this part of the range, that any geologist who had not previously made 

 himself acquainted with the true order of superposition, would naturally conceive the 

 Wenlock limestone to be younger than the Ludlow rock, and the Ludlow rocks than 

 the Old Red Sandstone. 



The convulsed state of the Wenlock limestone, near the southern termination of the 

 Abberley Hills, one mile north of the village of Martley, is explained in this ground 

 plan. 



E. 9,0. 



W. 



1 This ground-plan is simply an enlargement of what is represented in the Map. 



3 G 



