86 PROCEEDINGS COTTES\VOI,D CLUB 191 2 



At Box, however, the sequence and thicknesses of the beds 

 are as follows : — 



Generalized Section of the Great Oolite at Box' 



Rubble ^ 



Fine pale fissile Oolite with softer marly I 



beds, slielly in places, and much false- 20 ft. to 35 o 

 "Upper I bedded, with liarder beds of fine-grained I 



Rags," < Oolite at or near the base . . . .) 



etc. I Coarse shelly Oolite, one bed being known 



as the " Scallet Rag " or " White Rag " 5 ft. to 10 o 

 "Corn-Grit" .. .. .. .. 15 ft. to 20 o 



"Roof-Bed" 3 ft. to 5 o 



Bath ) 



Freestone j 



Fine Freestone or " Ground-Bed " . . 12 ft. to 14 o 



R-i^s "etc 1 Stone-beds (proved in well) . . . . 30 ft. to 40 o 



[Fullers' Earth] 



Maximum . . 124 ft. o in. 



The difference in thickness between the Great-Oolite beds 

 on the north and south sides of the Avon Valley is thus very 

 noticeable. Only the " Lower Rags " are represented on the 

 north side of the valley, the Bath Freestone and " Upper 

 Rags," etc., are absent. 



The late Charles Moore noticed this difference, and held 

 that it was due to faulting in Great-Oolite times, whereby, 

 while the ground to the south of the fault sank and continued 

 to receive deposit, that to the north remained stationary, and 

 the Freestone and " Upper Rags," etc., were not deposited.^ 



I hardly think Moore's " fault theory " will explain the 

 absence of these beds on the north side, or account for the 

 difference in level of the beds on the opposite sides of the 

 valley. With regard to this, it has been suggested that the 

 dip might account for the difference, but as the beds show 

 little, if any, dip, and the distance between the two sides of 

 the valley is so short, comparatively speaking, that, in my 

 opinion, can hardly account for the variation. 



1. Taken from "The Jurassic Rocks of Britain — Tie Lower Oolitic Rocks of Hngland 

 (Yorkshire excepted)" vol. iv. (1804), p. 267. Mem. Geol. Surv. , 



2. Proc. Bath Nat. Hist.' and .\ntiqu. F.C., vol. ii (i86f)) p. 40 



