Vol. 63.] OF THE KISSING TON-BTJRFORD DISTRICT. 439 



Subdivision. Leading Fossil. 



g ( ( Terebratula globata, auctt., Holectypus hemispJuericus, 



s J I. Rubbly Eeds. \ Agassiz, Tholadomya Murckisoui (Sow.), and Vol- 



c j [ sella gibbosa (Sow.). 



« ■{ II. Anabacia- I Anabacia complanata (Defrance), Terebratula globata, 



5 ! Limestones. \ auctt., non Sow., Nerincea Guisei, Witchell. 



§ III. Doultmg | Cl y peus jg ass i z i (Wright), Terebratula globata, auctt. 



It is -unnecessary to give any details concerning these deposits, 

 because they have been fully dealt with elsewhere in this Journal 

 (pp. 383-436) ; but it may be as well to emphasize the fact that 

 the Bubbly Beds are typically developed at Doulting-Bridge and 

 Farmcombe Quarries, near Doulting (Somerset) ; and that at 

 Midford there is only a very thin rubbly bed, full of Terebratula 

 globata, auctt. (flat form), which rests upon a bored and waterworn 

 surface of the Anabacia-IAmestories — the greater part of the Eubbly 

 Beds being absent. 



The Fullers' Earth succeeds the Bubbly Beds; and in the Midford 

 area the lower portion, at any rate, is of zigzag hemera. The Upper 

 Coral-Bed is of Truellii hemera, and the Doultmg Stone may be 

 of that hemera also ; but the Anabacia-Limestones and Bubbly Beds 

 appear to be of inter- Truellii-zigzag date. 



In the Bissington-Burford district there is no Upper Trigonia- 

 Grit nor Upper Coral-Bed, but the Clyjieus-Grit rests directly upon 

 the Upper Liassic clays. In the neighbourhood of Iccomb Camp 

 the Clypeus-Qxiit is said to be from 30 to 40 feet thick. 1 The top- 

 portion is rubbly, the bottom and greater portion massive-bedded. 

 The Bubbly Beds of the Bath-Doulting district may be paralleled 

 with the similarly-designated beds of the Bissington-Burford 

 district. The ^na&aaa-Limestones are intimately connected with 

 the Doulting Stone, and the two deposits together may be paralleled 

 with the ' Massive Beds ' of the district under review. 



The comparison may be carried further. Above the Bubbly Beds, 

 in a quarry near Great Bissington, is a thin clay-deposit with a 

 median bed of hard, brown, non-oolitic limestone (3 to 6 inches) 

 full of Ostrea acuminata, Sowerby. Similar bands of rock are 

 frequently found in the Fullers' Earth, and I have little doubt that 

 we have here the equivalent of a considerable portion of the 

 Fullers' Earth as developed in the Mid Cotteswolds and in the 

 northern portion of the South Cotteswolds. I have not been able to 

 date the clay, but it is certainly -post-Trueim. At the base of the 

 Fullers' Earth, and constituting the top-band of the Bubbly Beds, 

 is a rubbly limestone, about 6 inches thick, crowded with Terebratula 

 globata, auctt. It belongs to the Clypeus-Grit, because the echinoid 

 Clypeus Ploti was found in it. 



1 E. Hull, ' The Geology of the Country around Cheltenham ' Mem. Ceol. 

 Surv. 1857, p. 47. 



