﻿VoL 6l.] SEQUENCE IN THE BKISTOL AEEA. 227 



V. The sequence at Walton Castle. This locality is a little more 

 than three quarters of a mile due north of the quarry on 

 Strawberry Hill, and can be reached by turning off the 

 Portishead road along Holl Lane. 



(«) The upper part of the Cleistopora-Z<me and the lower beds 

 of the dathratiis-suhzone are well exposed to the east of 

 Castle Farm. 



(b) The resupinata-subzoiie is exposed at the top of Walton- 



Castle Hill and in a quarry near the western end of Holl 

 Lane. 



(c) Horizon y and the ' laminosa- dolomites ' are not exposed. 



(d) The Oaninia-Oolite is splendidly exposed in the large lime- 



quarries on each side of Holl Lane, between the Castle 

 and the Portishead road. 



Fauna 1 : — 



Cleistopora - Zone . 



Cleistopora aff. geometrica has been found in Clevedon Bay 

 (that is, in the upper part of the zone). There is a speci- 

 men from this locality in the Natural History Museum, 

 South Kensington. 

 Spiriferina octoplicata is very common in the upper beds near 

 Castle Farm. 



Clathratus -subzone. 



Spirifer aff. clathratus and var. occur in enormous abundance, 



and are associated with the same forms as elsewhere. 

 Zaphrentis is extremely rare. 



Lower resupinata-suhzone. 



Zaphrentis aff. Phillipsi is the dominant representative of the 



genus. 

 Gliothyris glabristria is uncommon, although I have found it 

 both on Strawberry Hill and Court Hill. 



Upper resupinata-subzone and Horizon y. 



Syringopora 6 is a characteristic and easily-distinguished 



form. 

 Zaphrentis aff. cornucopia} becomes the dominant species, but 



Z. aff. Phillipsi is still common. 

 Caninia cylinalrica and its mutations are abundant, and mark 



out Horizon y. 

 Syringothyris aff. laminosa and Michelinia occur somewhat 



frequently. 



Laminosa-subzone. 



Bands of Orthotetes and Chonetes aff. papilionacea are well seen in 



the ' Zamtnosa-dolomites,' especially in Hangstone Quarry. 

 The Caninia-Oolite contains the usual fossiliferous basal beds, 

 in which Orthotetes and Chonetes are abundant. 



1 Reference is made here only to points of especial interest. 



