Vol. 6 2. J AN TJKCONFOEMITY IN THE COAL-MEASUKES. 



547 



but a careful study of the circumstances leaves little doubt as to their 

 real nature. A few simple diagrams will sufficiently illustrate our 

 explanation (see fig. 15, p. 548). The first of these figures (a) shows 

 the mode of occurrence of these ridges in plan. It will be noted that 

 the outcrop of sandstone (of the Lower Series) marked X is entirely 

 unaffected by the ridges, or by the disturbance occasioned by them. 

 The second figure (b) shows the actual section parallel to the cliff- 

 line (and parallel also to the general strike of the Table-Rocks 



Fig. 14. — (See fig. 4, i>. 535, northern end of the section.) Photo- 

 graph showing the lowest bed of the Table-Bocks Sandstone (A) 

 curled up and abutting against the Mussel-Band (B). 



Sandstone) and about 3 yards from it. The third figure (c) is 

 one parallel to the last, but representing the probable state of things 

 beneath the cliff. Figures (d) and (e) show sections at right augles 

 to the cliff-line, one where there is no intruding ridge, and the 

 other along the line of such a ridge. The presence of pebbles in 

 one of the sandstone-ridges at M affords a further confirmation of 

 our interpretation. 



The thrusting action is most marked at the junction of the hard 

 and soft beds, that is along the plane of the unconformity. Thus 

 the sandstone-' curl ' at E contains pebbles ; at F two distinct beds 

 of pebbly sandstone are separated by what is probably squeezed- 

 in, or intruded shale (see fig. 6, p. 536); and at G a mass of 



