500 MR. M. ODLING ON THE [Oct. I913, 



Notes on other Sections. 



There are now no sections exposed in the Stonesfield district. 

 The sequence, however, at Stockey Bank, Stonesfield (in) has been 

 worked out by a committee of the British Association. 1 



It may be summarized as follows : — 



Limestones and marls, with many globose forms of Ehynchonella. 

 Stonesfield Slate Series. 



Neasran Beds : green, black, and grey clays and limestones. 

 Chipping-Norton Limestones. 



The sequence round Chipping ^Norton has been fully worked out 

 by Mr. L. Richardson, 2 who largely confirms and adds to Mr. Wal- 

 ford's observations. 3 The sequence is similar to that at Stonesfield, 

 ■except that the Stonesfield Slates are entirely or almost absent. 

 The accounts supplied of well-sections are for the most part so 

 vague as to be of little value. 



The descriptions given of the topmost bed of the Great Oolite 

 suggest that the ' Cream-Cheese ' or ' Fossiliferous Cream-Cheese ' 

 type of rock extends over a large area, occurring as far east as 

 Witney and Bampton. 



On the south, in the boring at the Oxford City Brewery, 4 the 

 ■Cornbrash is seen to be 17 feet thick, while 32 feet 8 inches is 

 assigned to the Forest Marble. 



In assigning 88 feet to the Great Oolite, it is probable that the 

 Fuller's-Earth Kock and the ' Rhynclionella Beds ' have been in- 

 cluded. The 28£ feet of beds described as belonging to the Upper 

 Lstuarine Series are extremely suggestive of the Negeran Beds of 

 Ardley. 



The 16 feet of rock described as Inferior Oolite seems to agree 

 more closely with the Chipping-Norton Limestone : the fragments 

 of the cores preserved in the Museum of Practical Geology, Jermyn 

 Street, London, do not resemble the Clypeus Grits of Fawler. 



The borings at Calvert (n), recently described by Dr. A. M. 

 Davies & Mr. J. Pringle, 5 are of great interest, the absence of 

 the Cornbrash and possibly of the lower beds of the Oxford Clay 

 being remarkable, as is the thickening of the Forest Marble. 



The absence of Neaeran Beds bears out the evidence of uncon- 

 formity noticed in the Ardley section. 



From the evidence of the specimens kindly shown to me by 

 Dr. A. M. Davies, I am inclined to think that the Fulloniau type 

 •of deposit predominated here until a later period, to the exclusion 

 of true Great Oolite. 



i Eep. Brit. Assoc. (Oxford) 1894, p. 304 ; ibid, (Ipswich) 1895, p. 415; 

 and ibid. (Liverpool) 1896, p. 356. 



2 'Inferior Oolite & Contiguous Deposits of the Chipping-Norton District' 

 Proc. Cotteswold Nat. F. Club, vol. xvii, pfc. 2 (1911) pp. 195 et seqq. 



3 'On some New Oolitic Rocks in North Oxfordshire' Buckingham, 1906. 



4 E. H. Tiddeman, ' Water-Supplv of Oxfordshire ' Mem. Geol. Surv. 1910, 

 p. 65. 



5 Q. J. G. S. vol. lxix (1913) p. 310. 



