﻿Vol. 6 1.] SEQUENCE IX THE BRISTOL AREA. 199 



D 2 = Subzone of Lonsdalia ftoriformis (Lonsdalia- 

 Subzone), 



Where exposed in the Avon section : — 

 Clifton side : 



(1) In the riverside exposure, from a little above Point Villa to 



the end of the exposure (that is, to the wall afc the bottom 

 of Bridge Valley-Road). 



(2) At the side of Bridge Valley-Road. 



(The first-named exposure is known as ' Round Point '"). 



Leigh Woods side : 



In Quarry 6 and in the exposures on the side of Stokeleigh 



Camp. 

 In the quarry on Rownham Hill. 



Special faunal characters : — 



Brachiopods: 



Productus ' giganteus' and Pr. cf. latissimus are not uncommon. 

 Spiriferids and Athyrids are very rare, and their identification 

 awaits further material. 



Corals : 



Cyathophyllam regium, the group of Lithostrotion typified by 

 L. PortlocH and L. ensifer, and Lonsdalia floriformis and its 

 variants only occur in this subzone, where they are abundant 

 and highly characteristic. 



The Clisiophyllids are common, especially in the conical forms 

 of the Dibunophyllum aff. turbinatum- group which are here 

 designated Dibunophyllum \p. 



Lithostrotion Martini in its typical form is rare, but the 

 mutations towards L. irregulare and towards Lonsdalia are very 

 characteristic. Lithostrotion irregulare reaches its maximum. 

 Lithostrotion junceum occurs sparingly. 



Axophyllmn is common. 



Alveolites is fairly abundant, as is also one of the Syringoporce 

 (cf. Syringopora distaus). 



Cyathophyllum Murchisoni, although common, is not so prolific 

 as in the lower subzone. 



e = Horizon e. 



Lithology. — Shales and hard grits (somewhat calcareous). 



Former designation. — Millstone-Grit (lower part). 



Where exposed in the Avon section. — Now bricked up, but 

 formerly exposed at the farther end of St. Vincent's Parade 

 (behind the < General Draper ' public-house) on the Clifton side. 



p2 



