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ME. L. RICHARDSON ON THE RH2ETIC AND [Aug. 1905, 



and 1896, a large quarry has been opened out in the Lower Liassic 

 limestones of this outlier, near Cross Farm, and the junction of 

 these beds with the White Lias (A of Lavernock) exposed to view. 

 The section is as follows : — 



Thickness in feet inches. 



f Marl and limestone-fragments seen 



Three bands of limestone, with marly 



partings 



Limestone 



Limestones and shales 5 



Shale 



Limestone in two conspicuous beds 



Shale 



Limestone 



9 



Ostrea liassica and 

 radioles of Pseudo- 

 cliadema. 



Ostrea liassica 

 common. 



Limestone and shales 



Three beds of limestone, with very thin 

 partings of shale. Locally called ' the 

 Washers ' 



Clay 



Limestone 



Shale, thinly laminated in the upper por- 

 tion, clayey in the lower 



Limestone, blue-centred 



' v Paper-Shales, as at Lavernock 1 



j i Shales, bluish, marly seen 3 



7 Ostrea liassica. 



Ostrea liassica. 



Unfortunately, the sequence downwards cannot be ascertained ; 

 but in the lane-side near the buildings at Cross Farm the following 

 details may be observed : — 



Thickness in feet inches 



Shales, black, with soft gritty layers at , 



the base seen 3 0( 



15. Limestone, hard, grey, micaceous, 

 with quartz -sand immediately 

 below ,.' 



Shales, black 



Sandy layer, chocolate-coloured 



4 

 1 



[Gap] 



In the limestone PuU 

 lastra arenicola is 

 abundant: wood and 

 fragments of fish- 

 scales occur. In the 

 quartz-sand Acrodus 

 minimus, Saurich- 

 ihys acuminatus, and 

 Gyro lepis Alberti are 

 common. 



Gyrolepis Alberti. 



/'Marlstone, hard, greenish-grey: 4 to 



^aj I 15 inches 9 Ostrea Bristovi. 



g § { Marly shales, dark greenish-grey and 



tji W I brown, with sandy seams 2 



i Marlstone, hard, greenish-grey 11 Ostrea Bristovi. 



The lamellibranchs in Bed 15 are, on the whole, well-preserved 

 and extremely abundant. As I did not recognize the fossil, I 

 submitted specimens to Mr. E. T. Newton, who replied : — ' This is 

 the shell which is known as Pidlastra arenicola, Strickland.' Ostrea 

 Bristovi abounds in the Sully Beds at this locality; but, in a deep 

 wheel-track some 350 yards to the north-east, the equivalent beds 



