36 



MK. L. RICHARDSON ON THE RH2ETIC OF [Feb. I9II, 



the deposits that are principally sought for in the workings are the 

 Planorhis Beds, which lie towards the foot of the northern slope of 

 the hill, a number of deep cuttings and tunnels had to be made, in 

 order to allow of the passage of the trolleys from the workings to 

 the kilns. The steep portion of the hill is thus literally sliced 

 through, and a magnificent series of sections made available. 



As might be expected, the differences between the beds exposed 

 in these sections and those seen in the railway-cutting are trivial ; 

 but I have noted the more important of them in the railway- 

 cutting section, giving the information in square brackets. 



North of Bawdrip the rocks are affected by two approximately 

 west-and-east faults, but their prevalent southerly dip is obvious, 

 and is still more so in the fine rail way- cutting on the way to 

 Cossington Station, at which place the Black Shales of the Lilstock 

 Beds reappear, forming the central portion of an anticline. 



Cossington railway-cutting. — Mr. J. E. Mostyn Clarke, 

 A.M.I. C.E., has described the sections on this railway, obtaining 

 the details which he recorded as the construction of the line 

 proceeded. 1 



When Mr. H. B. Woodward visited the section, he was accom- 

 panied by Mr. Clarke. Mr. Woodward noticed a bed resembling 

 the Cotham Marble in texture, but did not attempt any detailed 

 separation of the deposits, nor did he indicate in his record where 

 the Pteria-contorta Shales ended or the ' White Lias ' began. 



The details appended below were obtained in the eastern bank of 

 the cutting, alongside the goods-siding. A greater thickness of the 

 Black Shales was formerly exposed, but talus has accumulated and 

 has hidden a band of nodules that probably corresponds to Bed 9 in 

 the Dunball section. 



Section in Cossington Railway-Cutting-. 



Thickness in feet inches. 

 Lang-port ( Limestone in two beds, rather rubbly in 



Beds. \ between seen 1 



Clay, brown and dark grey : 2 to 4 inches 



1. Cotham Marble 



2. Shales, yellow and grey marly, very 



clayey at the top 3 



3. Limestone, hard, with a nodular bed 



occasionally on the top 



f (1) Shales, pale-yellow, marly 



Limestone : 2 to 4 inches 



Shales, yellowish : to 2 inches ... 

 Limestone, rather ' flaggy ' with 



clay in the bedding-planes 



(3) Shales, yellow and brown, clayey . 



-i (2) 



seen. 



1 Proc. Bath Nat. Hist. & Antiq. P.-C. vol. vii (1891-93) pp. 127-36 



[& section]. 



