﻿238 DK. A. VATJGHAN ON" THE PAL^EOtfTOLOGICAL [May 1 1)0 5, 



Cliothyris g labristria. 

 Cliothyris sp. (transitional form). 

 Spirifer aff. clathratus and var. 

 Syringothyris aff. cuspidata. 

 Camarotcechia aff. mitcheldecmensis. 

 Orthotetes crenistria (unit. Z). 

 Schizophoria resupinata. 



EhipidomeUa aff. Michelini. 

 Leptena analoga. 

 Productus cf. Martini. 

 Productus aff. pustulosis. 

 Productus aff. semireticulatns. 

 Chonetes cf. Jiardrensis. 

 Ckonetes papilionacea. 



Notes. — Spirifer aff. clathratus, Cliothyris glabristria, and Schizophoria 

 resupinata are commonest in the lower part of the subzone, but rare 

 above. Cliothyris glabristria and Schizophoria resupinata are extremely 

 abundant together. Chonetes cf. hardrensis teems in certain beds. 

 Chonetes papilionacea only occurs abundantly in the upper part of the 

 subzone. 



Euomphalus, Bellerophon, and several very interesting bryozoans also 



Horizon y is indistinguishable, since no specimen of 

 Caninia was found above the i"esnpinata-su.bzoia.e and under 

 the ' lammasa-dolomites.' 



Laminosa-siibzone. 



Sequence in ascending order : — 



(1) ' Xfl//^';?os«-dolomites.' 



(2) ' Caninia - Oolite ' resting upon a highly-fossiliferous band (the 



' sub-Oolite'). 



Exposures : — 



(1) can be seen at the top of the southernmost of the two 



quarries in the resupinata-beds. 



(2) is shown in a quarry a little farther west, and also in a 



very large disused quarry farther north, on the west of 

 the Charfield road. 

 In both quarries the ; sub-Oolite ' is well displayed. 



Fauna : — 



The 'laminosa-dolomihes ' are unfossiliferous, except for crinoid- 

 fragments. The ' sub-Oolite ' contains 



Caninia cylindrica. 

 Syringothyris aff. laminosa. 

 Serninula sp. (very small form). 

 EhipidomeUa aff. Michelini. 



Orthotetes is common in the base of the Caninia- Oolite. 



Orthotetes crenistria (mut. 



C) and 

 Chonetes aff. papilionacea 



in great 

 abundance. 



Seminula-Zone (Upper S 2 and Lower S 2 ). 



Lithologica-1 character. — Massive limestones, with shales, 

 and a highly-quartzose grit. 



Exposure. — A large quarry still farther west of the resupinata- 

 quarries. 



1 Palechinus is common at this horizon throughout the Bristol area, a fact 

 which was pointed out to me by Dr. Wheelton Hind (see also below, p. 256). 



