424 MK. S. S. BTJCKMAN ON THE BAJOCIAN [Aug. 1895, 



Lane in Pinchley Grove : — ft. ins. 



Lower Tri- 6. Ironshot limestone exposed for 29 yards, 

 gonia-grit. dropping 6 feet ; deduction for dip 1^ feet 



(Aulacothyris Meriani 8 inches from the 

 bottom of this bed.) 

 Upper Free- 7. Oolitic Freestone, the top bed pinkish, others 

 stone. whitish or cream-coloured, exposed for about 

 80 yards, dropping 22 feet ; 5£ feet deduc- 

 tion for dip gives 16 6 



Oolite Marl. 8. White marly stone, Rhynchonella Tatei, small 



Rh. sp., Terebratula fimbria, Nerincea, about ... 1 

 9. Whitish earthy stone, considerably mixed with 

 marl. Terebratula fimbria, common ; Lioceras 

 cf. bradfordense, fragment ; and Rhynchonella 

 subobsoleta at about 1 foot 6 inches from 

 bottom of bed. Total thickness 2 



10. Similar, perhaps rather more marly ; Tere~ 



bratula curvifrons, common ; T. submaxittata. 1 8 



11. Soft, white, chalky marl; Rhynchonella sp. in 



top part ; one specimen of Zeilleria Leckenbyi 



at the bottom 10 



Lower Free- 12. Cream-coloured oolitic freestone, 

 stone. 



It will be noticed that the Upper Trigonia-grit directly overlies 

 the Notgrove Oolite, so that the Witchellia-grit is absent: it has 

 been denuded altogether before the Upper Trigonia-grit was laid 

 down. This defines the geographical extension of the Witchellia- 

 grit in a southerly direction (see infra, p. 437). 



The thickness of the Notgrove Freestone works out at 13 feet 

 5 inches. This accords very fairly with the figure obtained for 

 Ravensgate. The Gryphite-grit and the Buchnani-grit are very 

 obscurely seen in the lane ; it is, therefore, quite possible that a 

 foot or so too much may have been given to the former at the 

 expense of the latter. 



It is interesting to carry this examination somewhat further, and 

 to compare with the results obtained a section on the new line 

 between Andoversford and Cirencester. I have already described 

 the sections of this line r and of the line from Andoversford to 

 Bourton-on-the- Water, 2 on both of which the Notgrove Freestone is 

 much in evidence, but the Witchellia-grit is absent. All the sections 

 of these railways might, however, be profitably examined once more 

 in the light of experience gained in the district attacked by the 

 present paper, not with any great hope of finding the Witchellia-grit, 

 but with the view of bringing the details into accordance with those 

 now given. Thus the following section has been amended, and 

 differs somewhat from what it was in my above-quoted paper. The 

 former section was made while the cutting was incomplete, when 

 the beds presented a much different and far more compact ap- 

 pearance, before the frost had lent its aid in giving an additional 

 factor of distinction — degree of liability to shatter and crumble. 



The following, therefore, is the section recently made : — 



1 Proc. Cottesw. Nat. Field-Club, vol. x. (1890) p. 94. 



2 Ibid. vol. ix. (1887) p. 108. 



