﻿Yol. 6l.^\ SEQUENCE IN THE BEISTOL AREA. 205 



Exposure. — The greater part of this zone lies at, or beneath, 

 the level of the roadway, so that it can only be examined in 

 the occasional bands of harder limestone or in the drainage- 

 trenches at the foot of the slopes. The basal beds of the 

 zone can, however, be more easily worked, since they form the 

 western extremity of the small Palaeozoic projection already 

 mentioned. 



The zone may be considered to end at the base of the massive 

 Limestone-series which commences at Kingrove-Farm Bridge. 1 



Fauna. — The 'Palate-Bed' is crowded with coprolites, and 

 palatal teeth are abundant in it ; similar teeth are found less 

 frequently in the overlying beds, for a considerable distance. 

 Corals: none found. 

 Brachiopods : 



(1) bassus-suh zone (K z ). 



Eumetria ('Retzia') aff. carbon aria. "j 

 Camarotoechia mitcheldeanensis. I All extremely 



Leptena analoga. j abundant. 



Orthotetes crenistria, especially mut. K\. J 

 Syringothyris aff. citspidata. 

 Spirifer aff. clathratus. 

 Cliothyris Royssii. 

 Chonetes cf. hardrensis. 



(2) octoplicata-s ub zone (K 2 ). 



Spirifer aff. clathratus and its variety become common in the 

 very poor exposures near the top of the zone. 



Correlation with the Avon section. — All the above fossils 

 occur at the same levels in the Avon section. No specimen of 

 Cleistopora, Spiriferina octoplicata, or Productus bassus has as yet 

 been discovered at Sodbury. The failure to find the two first- 

 named fossils is not a matter of surprise : (1) because of the 

 practical absence of exposures in the upper part of the zone ; and 

 (2) on account of the difficulty of noticing either fossil except on 

 weathered surfaces, which are necessarily rare in a new cutting. 



K r — Though Productus bassus itself has not yet been met with 

 at Sodbury, the subzone is well characterized by the great 

 abundance of Camarotoechia mitcheldeanensis, Leptena, Or- 

 thotetes, and Eumetria ; moreover, the particular forms of 

 Syringothyris cuspidata and Orthotetes crenistria which occur 

 in these basal beds are precisely those that are found at the 

 same level in the Avon section. 



K 2 . — This subzone may be said to be practically unexposed in the 

 Sodbury cutting, but the increasing abundance of Spirifer an°. 

 clathratus has been m ide out in its upper portion. 



1 This bridge crosses tbe railway-line, about 300 yards north of Kingrove 

 Farm. 



