148 



THE BATH OOLITE PERIOD. 



CHAP. 



In the Windrush quarries near Burford Mr. Lonsdale m ob- 

 served : 



ft. 



/ Rubbly limestone i 



d < Brownish marlstone 6 



( Rubbly limestone 4 



SPale sandy marl 3 

 Rubbly limestone 



o 



I Light coloured clay ........ o 



b Rag and freestone . . . 15 



in. 

 O 



O 



o 

 o 

 6 

 6 



o 



Sandy laminated stone 



variable. 



On comparing these sections we observe special differences in the 

 upper part, but a considerable agreement in the lower part. 



Dr. Fitton obtained the following account of the strata at 

 Stonesfield n : 



f! 



"Rubbly limestone 

 Clay with Terebratulites 

 j^ Limestone 

 I Blue clay 

 ^Oolite 

 c Blue clay 

 b ' Rag,' consisting of shelly oolite, with casts of bivalves and 



univalves, about . 25 o 



Soft stuff,' 6 in., yellowish sandy clay, with thin courses 



of fibrous transparent gypsum. 



Upper head,' i ft. 3 in. to i ft. 6 in., sand enveloping a 

 course of spheroidal laminated calcareous gritstones, 

 The slate beds, which pro d u ce the slate. These are called ' Potlids,' 



consisting of ] from their figurej and rec eive with the other slaty bed 

 the name of ' Pendle,' as characteristic of the workable 

 stone. The stone is partially oolitic and shelly, some- 

 times full of small fragmentary masses. 

 Manure,' or ' Race,' i ft., slaty friable grit rock. 



(' Lower head,' I ft. 6 in. to 2 ft., sand and grit, including 

 a course of spheroidal concretions of slate, as above. 

 ( Bottom stuff,' i ft., sandy and calcareous grit, with 

 admixtures of oolitic grains. 

 The floor of the slate beds is 'rag,' like the oolite above. 



In the railway cutting near Stonesfield are several instructive 

 sections. Where the road crosses by a high viaduct we have the 

 following series of beds : 



Proceedings of Geol. Soc. i. 414. 



Zool. Journal, vol. iii. 



