﻿232 DB. A. VAUGHAN" ON THE PALiEONXOLOGICAL [May 1905, 



immediate neighbourhood of Clapton, at least one of 

 which is entirely surrounded by the Pennant Series (see 

 Sheet 19, Geol. Surv. 1-inch map). 

 The quarry is on Horizon fi, as indicated by the following- 

 fossils : — 



Zaphrentis aff. Phillipsi. 

 Spiriferina octoplicata. j Abun- 

 Cliothyris Royssii (unit.). J dant. 



S'pirifer aff'. clathratus. Abundant. 

 Orthotetes crenistria. 

 Syringothyris aff". cuspidata. 



It is, in my opinion, entirely out of the question that there is a 

 complete sequence from the Tournaisian up to the Coal-Measures 

 anj'where in the Clapton-Clevedon-Portishead area. There is no- 

 where sufficient space between the outcrops of these two formations 

 to allow of the complete sequence being developed ; in fact, I have 

 seen no Visean strata north of Tickenham Church. 



1 am strongly inclined to believe that there is, in this region, 

 evidence of post-Tournaisian upheaval and denudation, and that the 

 area was not again submerged until the Coal-Measures were laid 

 down in a narrow inlet, bounded on the west by the Clevedon- 

 Portishead ridge and on the south by the western part of the 

 Clevedon-Failand ridge. Within this inlet, the masses of Carbon- 

 iferous Limestone in the Clapton district stood up as small islands. 



(e) Tickenham. — The lower beds of the Semimda-Zone can 

 be made out in a field immediately east of Tickenham 

 Church. Here I found Productus sp. (cf . P. 6), Seminula 

 jicoidea, and Ortliotetes crenistria (mut.). 

 We may unhesitatingly compare these beds with the lowest 

 beds in Dod's Quarry (see p. 241) ; a result in complete accord 

 with their stratigraphical position. I strongly doubt the 

 completeness of the sequence between these beds (of lowest 

 Yisean age) and the Coal-Measures which are found a few 

 yards farther south. There is certainly no room for the Upper 

 Semimda-Zone, the DibunopliyUum-ZoinQ, and the Millstone- 

 Grit. 



(2) A quarry near Moat-House, north of the Clevedon road. 

 If miles west of Fail and Inn. 



Upper clathratus-subzone and Lower resujiinata-subzone. 

 From this quarry I have obtained : — 



Zaphrentis aff. Phillipsi. 

 Cliothyris glabristria. 

 Cliothyris sp. (?). 

 Spirifer aff. clathratus. 

 Syringothyris aff. cuspidata. 

 Syringothyris aff. laminosa. 

 Orthotetes crenistria (mut. Z). 

 Leptena analoga. 



Note. — Cliothyris glabristria and Rhipidomella aff. Michelini are extremely 

 abundant ; Zaphrentis and Schkophoria are rare. 



Rhipidomella aff. MicJielini. 

 Schizophoria resupinata. 

 Productus cf. Martini. 

 Productus aff. pustulosus. 

 Productus aff. semireticulatus. 

 Chonetes cf . hardrensis. 



aff. papilionacea. 



