166 



PROF. T. T. GROOM ON THE GEOLOGICAL [Feb. IQOO, 



can be very rarely detected in the breccia ; but it is clear, from the 

 way in which the base tends to follow the contour-lines, that it rests, 

 as Phillips states, on the Silurian beds as a cap, the base of which 

 as a whole is gently inclined. The Coal Measures,, too, from their 



Fig. 16. — Section from Wallhouse Wood to Barrel Hill Farm. 



Barrel Hill Farm 

 \ 



Wallhouse Wood 

 1 



w. 



\ 



\ 



isaJ t 





*fi\ Wallhouse c 

 Wood r 



is — 



ors; ULjA'ULL 



/ s 



/ & 



Fig. 17.— Section /^jp\ 



through the southern <£%J Y^\ 



part of Wallhouse y' \^ 



Wood. \* 





'£>' 



V*k 



ft- 



[Scale of figs. 16 & 17 : 4 inches = 1 mile.] 



OES = Old Red Sandstone and 



Passage-beds. 



UL = Upper Ludlow Shales. 



AL = Ayrnestry Limestone. 



LL = Lower Ludlow Shales. 



WL 2 = Wenlock Limestone. 

 Tr = Trias. 



S = Shales of doubtful age. 

 FF= Faults. 

 ff— Hypothetical faults. 



position, must have a gentle dip, very different from that of the 

 underlying Silurian beds. The disturbances mentioned by Murchison 

 must be such as a soft yielding stratum would undergo when 

 squeezed between two more massive and rigid formations. The 



