VOL. XVII. (2) INFERIOR OOLITE— CHIPPING NORTON 203 



traced through the Cotteswold Hills, it is found to attenuate 

 considerably as clay, and in the neighbourhood of Stow-on- 

 the-Wold to be largely replaced by Hmestone again. 



As far as can be seen, this replacement is effected in the 

 local Fullers' Earth of the Stow district, from near the base, 

 upwards. Thus, in the railway-cutting about half-a-mile to 

 the south-west of Harford Bridge, between Notgrove and Stow, 

 there is the following section :' — 



SECTION IN RAILWAY-CUTTING NEAR HARFORD 

 BRIDGE, BETWEEN NOTGROVE AND BOURTON 



f 



Thickness in feet ins. 



Gt. Oolite. Limestone, generally white, rather coarsely-oolitic : 



seen about . . . . . . . . . . . . . . 80 



Clay, greenish, yellow-streaked, with buff-coloured 



layers of marl . . . . . . . . . . 05 



■^' I Marls, buff-coloured, with a harder layer at 6 inches 



I from the top . . . . . . . . . . 20 



2. Marls, bluish . . . . . . . . . . . . 12 



(Marls, buff-coloured and yellowish, with layers of 

 clay and a number of limestone-bands, some of 

 which are fissile and sandy, finely-micaceous, with 

 annelid tracks and a bed about the middle full of 

 specimens of Ostrea, sp. : about . . . . . . 3 9 



4. Clay, very tough, yellowish : perhaps about . . 10 



5. Clays, bluish, marly : about . . . . . . 150 



(At the base of these clays is a course of water- 

 worn pebbles, often coated with Serpula, Os- 



trea and Polyzoa). 



6. "Red sand, derived from the decomposition of [the 

 top-portion of] bed 4 [i.e., my bed 7]. "2 . . i 2 



x: \ Limestones, brownish sandy, with numerous speci- 



T ' ) mens of Ostrea sp., plant-remains : about . . 6 6 



8. Layer of marly material, with crushed oyster-shells, 

 described by Walford as ' a dark blue clay,' and 

 given by him as . . . . . . . . . . 10 



Inf. Oolite. Cly peus-Grit. Usual type : seen . . . . . . 50 



From this section it will be seen that limestones 

 have developed in the lower portion of the Fullers' Earth. 

 There is clay below them, and I presume that it is this bed 

 which is represented at Great Rissington, where it contains an 

 Os/r ea-Limestone . ^ 



1 This section was first described and accurately interpreted by Mr E. A. Walford (Q. J. G. S., 

 vol. xxxix. 1883, pp. 225-226). Subsequently, in 1887, it was noticed in greater detail by Mr S. S. 

 Buckman (Proc. Cotteswold Nat. F.C., vol. ix., pt. 2, pp. 123 and 128). See also Mr Walford's paper 

 " On Some New Oolitic Strata in North Oxfordshire " (1906), pp. 6 and 7. 



2 Walford. "On Some New Oolitic Strata, etc." p. 6 

 Quart. Joum. Geol. Soc, vol. Ixiii. (1907), pp. 440-441. 



