LiTHOLOGY. 



A rubbly thin bedded 

 Limestone, with un- 

 even sui'face, and 

 occasional partings of 

 marl and clay, con- 

 taining fossils. 



A coarse fissile false- 

 bedded Oolite, with 

 bands of marl or clay 

 inter stratified there- 

 with. 



Yellow clay, locally 

 developed. 



Siliceous sands, sandy 

 Limestone, and oolitic 

 freestone. 



Shelly oolitic Limestone ; 

 thin bedded rubbly 

 Oolite ; hard brown 

 oolitic Limestone, full 

 of shells and oysters. 



A hard sandy fissile 

 Oolite, capable of 

 being split into roof- 

 ing slates. 



Brown or blue clay, 

 sometimes breaking 

 up into conchoidal 

 fragments. 



194 

 Formations, 



COKNBEASH. 



Forest Marble. 



Bradford Clay. 



Forest Marble. 



Great Oolite. 



Stonesfield Slate. 



Fullers Earth. 



Leading Fossils. 



Terehratula intermedia, 

 T. ohovata, Avicula 

 echinata, Pygaster 

 Morrisii, Echindbrissua 

 orbicularis. 



Ostrea rugosa, 0. acumi- 

 nata, 0. costata. 



Terehratula digona, T. 

 coarctata, T. maxiJlata, 

 Apiocrinus ParJcinsoni, 



Ostrea rugosa, 0. acu- 

 minata, 0. costata. 



Purpuroidea, Pteroceras, 

 Alaria, Gerithium, 

 Cliemnitzia, Nerincea, 

 Clypeus Mulleri, Echi- 

 nohrissua Woodwardii. 



Trigonia impressa, Ger- 

 villia acuta. Bones of 

 Mammals and Ptero- 

 dactyles. Palates of 

 Fishes. 



Pholadcymya Vezelayi, 

 Ceromya plicata, 

 Pygurus Michelini, 

 Acrosalenia spinosa. 



Fullers Earth. — Is a thick argillaceous deposit, separating 

 the Inferior from the Great Oolite formations, and consisting 

 of regularly bedded, blue, brown, and yellowish clay, shales 

 and marls, with inconstant bands of nodular Limestone ; at 

 Box Tunnel, near Bath, it is about 150 feet thick, and in 

 Sapperton Tunnel, Stroud Valley, 70 feet ; near Amberley 

 church there is a fine exposure of this rock, full of the small 

 -curved oyster, Ostrea acuminata, so abundant in this formation. 

 At Symonds Hall Hill, the Fullers Earth is well seen in situ. 



