i86 PROCEEDINGS COTTESWOLD CLUB 1913 



The grey, fine-grained sandstones, in part fissile, which 

 constitute bed 3, suggest a Stonesfield-Slate horizon. From 

 similar " Passage Beds," discovered in the sinking of certain 

 of the shafts for the Sodbury Tunnel, Prof. S. H. Reynolds 

 and Dr A. Vaughan obtained the ammonite Perisphindes 

 gracilis (J. Buckman).' The same species was noticed by 

 Witchell in the equivalent beds at Stroud Hill."^ This am- 

 monite is characteristic of the true Stonesfield Slate of 

 Puckham (near Cheltenham), of Eyeford and Stonesfield, 

 Oxon. 



Fullers' Earth. — The thickness assigned to the Fullers' 

 Earth at Sodbury by Reynolds and Vaughan, is 90 feet.^ In 

 the Great Western Railway Tunnels at Sapperton it has been 

 noted as between 80 and 90 feet thick.* While the upper 

 limit of the Fullers' Earth is not readily fixed, the lower limit 

 is very obvious : the greenish-grey Fullers'-Earth marls, with 

 their noticeable conchoidal fracture, rest directly upon the 

 Rubbly Beds of the Inferior Oohte. 



Inferior Oolite. — No rock corresponding to Witchell's 

 White Oohte, as developed at Stroud Hill (according to that 

 author's record), was observed ; but the Rubbly Beds were 

 unmistakable. Although, owing to non-exposure to atmos- 

 pheric conditions, they were of a bluish colour, it was easy 

 to see that they would soon weather so as to assume the aspect 

 of their equivalents in such sections as that on Stinchcombe 

 Hill. 5 



The White Oohte, as developed in the Horton-Rectory 

 Quarry in the South Cottes wolds, ^ followed below the Rubbly 

 Beds and was 15 feet thick. It also was, as a rule, of a bluish 

 colour. 



The Clypeus-Gvit and Upper Trigonia-Grit, except in the 

 matter of their colour, were quite typical ; but there was no 



1 Quart. Joum. Geol. Soc., vol. Iviil. (1902), p. 741. 



2 Proc. Cotteswold Nat. F.C., vol. vii , pt. 2 (for 1879-80), p. 124. 



3 Quart. Joum. Geol. Soc., vol. Iviii. (1902), p. 741. 



4 Proc. Cotteswold Nat. F.C., vol. v., pt. 3 for 1870 (1871), [Plate] B. 



5 Proc. Cotteswold Nat. F.C., vol. xvii., pt. i. {19x0), p. 96. 



6 Ibid., pp. no and 112. 



