THE GEOLOGY OF TYTHERINGTON AND GROVESEND. 11 



an anticlinal roll of the Palaeozoic beds. The second (not 

 noted in Mr. Meredith's section) occurs a little before the 

 6^-mile post, and shows the Old Red beds dipping at an angle 

 of about G0° to the west. 



3. The Tytherington and the Clifton Section Compared. 

 Several readings of the beds in the classical Clifton section 

 of the Avon gorge have been gi\en, of which the most 



'•^'1 ^>'\^ n.*"^ "^.L-^^/TT^-r^ — ^/f^-^>-r7^ 



•^r[>;:\-: 



c) 



^iBl 











Fig. 2. 



Sketch Section, northern end of Grovesend Tunnel, to show Basement 

 Beds of Keuper resting on upturned edges of Old Bed Sandstone with 

 strike N.E. by N. 



a a, Red shaley beds of 0. R. S. ; h h, Conglomeratic beds of 0. R. S. 

 with pebbles of milky quartz ; c c, Conglomeratic and brecciated 

 Basement Beds of Keuper, with milky quartz pebbles from 0. R. S., and 

 brecciated fragments of 0. R. S., with some Mountain Limestone. 



recent is that by Mr. E. Wethered, in his valuable paper 

 " On Insoluble Residues from the Carboniferous-Limestone 

 Series at Clifton " (Q.J.G.S., May, 1888). The classification 

 of the beds he adopts may be summarized in the following 

 table : — 



