Vol. 51.] THE BAJOCIAN OF THE MID-COTTESWOLDS. 427 



the significance of Bed 17, which. Mr. Woodward has rightly appre- 

 ciated. I had come to the same conclusion during the work for 

 this paper at "Wistley Hill and Bavensgate before his book was 

 published ; but such a clay-bed had not come to my notice when I 

 described the railway. Bed 17 is obviously contemporaneous with 

 the Harford Sands, which are so much more important to the north 

 and north-east. 



As to the strata now called Buckmani-grit, they were parted 

 between the Gryphite-grit and the Lower Trigonia-grit, the need of 

 a distinct term not having been recognized. The Gryphite-grit was 

 credited with the larger share, and so its thickness was made 

 rather considerable. It is not possible, under the present system of 

 treatment, to regard more than 4 feet as having been deposited 

 contemporaneously with the true Gryphite-grit bed of Leckhampton, 

 that of necessity being taken as the typical locality for reference. 



Above the Gryphite-grit there is a very remarkable thickness of 

 the Notgrove Freestone. It is now put at a greater thickness than 

 before, based on the estimate of a workman, with which I saw no 

 reason to disagree. All this thickness is shown in the one cutting, 

 but even then this deposit is incomplete, for there is no Upper 

 Trigonia-grit — that has been removed by Quaternary denudation. 

 Other cuttings show the Upper Trigonia-grit resting on the Notgrove 

 Freestone ; but they give no clue to the thickness of the Freestone. 

 All that can be said is that about 30 feet of Notgrove Freestone is 

 shown in one cutting ; that then the deposit is incomplete ; that 

 the thickness may be considerably greater ; but 30 feet is a safe 

 minimum. 



There is no reason to doubt that the Witchellia-grit once capped 

 the Notgrove Freestone here shown, but it has been removed by 

 Bajocian denudation. Such being the case, it is very instructive to 

 notice the great thickness which would have separated theWitcheUia- 

 grit from the Gryphite-grit, and then to compare that with the 

 Sandford Lane ' Fossil Bed,' as in the diagram (Table III.) on the 

 opposite page. Therefrom it will be understood how no difficulty 

 could arise in appreciating in the Cotteswolds an ammonite-sequence 

 which in Dorset the paucity of sediment obscured, though that 

 seems a paradox. 



Analysis op Sections. 



A tabular statement of the results obtained by an analysis of all 

 the sections may now be advantageously given. In the first place, a 

 straight line from Mount Surat N~.E. by N. to Leckhampton has 

 been taken ; and the thicknesses of the various deposits in the 

 different quarries are given in Table IV. (p. 428), with notes where 

 required. These thicknesses have been plotted to scale in the 

 diagram, Table VI. (facing p, 430), by the same method as in my 

 former paper ; that is, localities off the line have been placed at jthe 

 distances where they fall at right angles to it. From Leckhampton 

 Hill a second line has been drawn at an obtuse angle to the first, 

 to Cold Comfort due east ; and at the side of the Table, for com- 



