MOOEE ABXOEilAL SECO>-DAEY DEPOSITS. 505 



ft. in. 

 Stone 1 8 



10 



2 3 



Eagstone and rubbly beds 7 8 



Conglomerates, thickness unkno"vvn. 



18 



In all the sections of ^Yhite Lias that have heen prcvionsly noticed, 

 the lithological character ef the beds is precisely alike ; for, in all, 

 the beds have been deposited nnder ordinary conditions ; bnt no 

 sooner do they meet the Carboniferous Limestone, and are uncon- 

 formable, than their texture is entirely changed, and they become 

 thickly bedded and conglomeratic. The abundance of Jfodiola 

 minima and other remains shoAvs clearly that this deposit belongs 

 to the White Lias ; but its texture is so precisely like the Sutton 

 stone that it might readily be mistaken for that rock. Like the 

 Sutton stone it is very durable, and may be raised in blocks of 

 many tons weight, and, were there facilities for its transit, might 

 be largely used. At the base of the quarry there are thick con- 

 glomerates with Ostrea intusstriata , the thicknesses of which are 

 unknown, and in which galena is found, as at Sutton. A Thecos- 

 milia in casts is rather plentiful at this place. 



7. Section near ShejDton Mallet. — As the Liassic beds of Shepton 

 Mallet are of much interest, and will have an important bearing on 

 the correct determination of the age of the Sutton-stone series, I give 

 them in detail. They have been deposited on the southern slopes 

 of the Carboniferous Limestone of the Mendips, and in some in- 

 stances rest unconformably upon it. I shall first give their passage 

 from the Keuper upwards along the line of the railway from Shep- 

 ton to Wells. The beds dip gradually to the east, passing under the 

 Middle and Upper Lias and Inferior Oolite at Doulting. 



Section in a Railiuay -cutting West ef Shepton. . 



Keuper : Variegated marls 



EJuBtic beds : light-blue sandy stone and marl-beds 8 9 



Band of clay \ 2 



Stone 8 



Elite clav 1 



Stone..'. 8 



Thin bands of clay and stone 1 8 



Dense black clay, full of Khatic shells and metacarpal bones of 



Scelidomuri'.s .' 12 



Flintybed? 1 6 



Blueclay 3 



White Lias : eighteen beds of a bluish-grey colour 8 



fifteen beds, cream-coloured G 



Lovxr Lias : — 



1. '^\\Q ^^j,^\\\xvL\\xnQ:xovi^ Ostrea intusstriata ^Odrcaliassica,k.c, 4 



2. Gritty blue limestone, with Ostrea liassica 3 



3. Blue clay 4 



4. Bed of irregular stone 2 



5. Clay 3 



6. Rubbly stone, with Terchratula pztnctata, Bhi/vchonella variabilis, 



Lima gigantea, Ammonites planorbis, A. Johnstoni, Tcctcn ToUiur, 

 Lima tubcrculata 6 



