"Vol. 69.] BATHONIAN ROCKS OF THE OXFORD DISTRICT. 487 



Mr. Barrow has divided the Great Oolite of the Ardley section 

 into three divisions — designated respectively 1st, 2nd, and 3rd 

 Blocks, taken in descending order x ; the lower part of the 3rd 

 Block, however, I am inclined to separate off as being Fullonian. 

 Mr. Barrow's divisions are adopted in this paper, with the exception 

 that the break between Block 1 and Block 2 proves to be situated 

 at the base of the First Terebratula Bed instead of at the top of it. 



Fullonian. 



In this district the Fullonian rocks are now recognizable only 

 in the Ardley section, but they have been described in some detail 

 by Mr. A. E. Walford from the Stonesfield and Chipping-JN T orton 

 districts 2 ; and also by Mr. L. Richardson from the latter district. 3 



The upper beds consist of compact, very fossiliferous limestones ; 

 while the lower part is almost entirely composed of clays and 

 sandy beds, often of a remarkably green colour. The lowest bed, 

 the ' Chipping-Norton Limestone,' consists of a very argillaceous, 

 somewhat sandy limestone, which in the Ardley Section is crowded 

 with HJnjnclioneUce, while on the east it consists chiefly of buff- 

 coloured limestone. 



The following beds are valuable for purposes of correlation : — 



Cornbrash. 



Terebratula-intermedia Beds. 

 Forest Marble. 



Great Oolite. 



Cream-Cheese Bed, passing down into the Fossiliferous 



Cream-Cheese Bed. 

 First Terebratula Bed. 

 Second Terebratula Bed. 

 Nerincea Bock. 

 Roach Bed. 



Fullonian. 



Fuller's-Earth Rock. 

 Ehynchonella and Inoceramus Beds. 

 Astarte Limestone 



1 ' Summary of Progress of the Geological Survey for 1907 ' Mem. Geol. 

 Surv. 1908, pp. 149-50; & Proc. Geol. Assoc, vol. xxi (1909-10) pp. 40 et seqq. 



2 ' On some New Oolitic Rocks in North Oxfordshire ' Buckingham, 1906 ; 

 also Rep. Brit. Assoc. 1894 (Oxford) p. 304, ibid. 1895 (Ipswich) p. 414, 

 & ibid. 1896 (Liverpool) p. 356. 



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

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



Q. J. G. S. No. 275. 2 k 



