COTTESWOLD DISTRICT. 55 



Red Post Quarry. — Due north of Radstock on the Bath road. There are 

 twenty-one feet of beds exposed here, made up of oolitic grains and comminuted 

 shelly matter in small granules. It is pale in colour, but weathers brown, and 

 may be regarded as an inferior freestone. There are a few fossils here and there, and 

 low down occur traces of a Trigonia-hed, but the most interesting feature for us 

 is a line of harclish stone, between three and four feet from the top, which contains 

 casts of a Nerinaa with very complicated folds (Ptygmatis). We cannot help con- 

 trasting these thick and comparatively unfossiliferous exposures, entirely confined 

 to one zone of the Inferior Oolite, with the dozen feet or so of Burton Bradstock or 

 Bradford Abbas, full of organic remains, and exhibiting, if not the entire forma- 

 tion, yet most excellent representatives of both the Upper and Lower Divisions. 

 There are a few other exposures in this neighbourhood of the same horizon con- 

 taining Nerinaia, and notably one at Caenicot. 



Twerton Hill. — We pass over a considerable extent of country without finding 

 much of interest in the Inferior Oolite, until within one and three quarter miles west- 

 south-west of Bath. At the Mission Chapel there are two exposures, one on either 

 side of the road. In that on the east side the Fuller's Earth may be seen atop, 

 and below this about fifteen feet of rough freestone is worked. The upper portion 

 is very white and chalky. About ten feet down the stone becomes firmer, and 

 here occurs a shell-bed in very fine Oolite, which contains Nerinaa Guisei and 

 another species, also an Maria and numerous Trigonia, Ostrew, &c. 



On the opposite side of the road is a disused quarry, where the face of rock is 

 somewhat limited. Towards the top is a shell-bed with Nerincea and corals, and 

 hereabouts may be noted Ceromija striata, Pholadomya Heraulti, and several 

 species of Myacites, some in a vertical position. This deposit rather reminds us 

 of the Pholadomya-grit, a term given by Lycett to the series of beds usually known 

 as the Clypeus-grit. The point to observe here is that, although there are fifteen 

 feet of rock, only the very highest series of beds are exposed, and these contain 

 Nerinaa, like their equivalents near Radstock. 



Mideoed. — Three miles south-south-east of Bath. Owing to a cutting on the high 

 road we obtain here a complete section of the Inferior Oolite Limestone — the first 

 that we have seen in No. 2 District. There is probably about forty feet of rock, and 

 the whole of this mass belongs to the Upper Division. Indeed, we may go closer 

 than this, and regard it as mainly, if not wholly, within the Parhinsoni-zone, since 

 Ammonites Martinsii occurs quite in the lower stage, which appears to me to re- 

 present the Upper Trigonia Grit of Stroud and Cheltenham. In that case the 

 Inferior Oolite Limestone of this section would be the equivalent of the entire 

 Upper, and part of the Lower, Ragstones of the Cotteswolds proper. There are 

 but few Gasteropoda from here, and I should scarcely have ventured to say so 

 much about it but for the fact that the Wtdford Sands, which underlie this limestone, 



