24 



ME. L. EICHAEDSON ON THE EHiBTIC OF [Feb. I9II, 



14. 



[St. Audrie's Slip.] Thickness in feet 



C Shales, black, laminated : \ , 



( 15 to 21 inches ) l 



f The B n e - B e d. Five lay O 

 I ers of a dull grey siliceous | 

 <J rock with rolled pieces of )- 



15. 



16. 



17. 



18 

 to 

 22. 



23. 



24 



inches. 

 6 



limestone, and at the base I 

 t_ a layer free from pebbles J 



Shales, black 



C Sandstone layers, thin,") 

 < greenish - yellow, mixed > 



i (. with black shale j 



[__ Shales, black 



C Limestone, hard, grey. Se- 

 3 lenite and baryto-celes- 

 1 tine, and fibrous calcite 



L (' beef ') in joints 



C Shales, black. From Bed 17 ") 

 j to the marls, according to f r. 

 1 Etheridge, is 6£ feet less f ^ 



V. 1 foot 9 inches J 



( Limestone-nodules, hard, ") ~ 

 i blackish : to 2 inches ... ) 

 ( Shales, black and green- 7 , 



\ speckled ) 



C Black eai-thy shale, with 

 •< lumps of pale-grey marl. 

 (_ Basal Bone-Bed 



( Hard, pale-grey, earthy > ~ 



I marlstone ) 



Greenish-grey marl 



Marl, hard, pale 



Marl , greenish grey 



Marl, hard, pale 



C Shale, pale-grey, marly, with 

 -] thin lines of hard marl in 



(. the middle 



C Marl, hard, pale-grey, with ") 



\ lines of softer marl ) 



C Marl, dark grey, tough, with S 

 < conchoidal fracture and >■ 

 (. thin hard sandv lines ) 



CAcrodus minimus Ag., Gyro- 

 I lepis alberti Ag., fragments 

 <{ of bone and coprolites, sliell- 

 I debris (Isocyprina?), and small 

 l^ quartz-pebbles. 



Shelly at the base, where it 

 contains Isocyprina ewaldi, 

 Volsella minima (Moore non 

 Sow.), and Pleurophorus elon- 

 gatus. Protocardia rhcetica 

 L, (teste Etheridge). 



9J 



33 



Fish-scales. 



( Annelid-burrows and Gervillia 

 1 prcecursor. 



Beds a, b, & c constitute the 'Ostrea-Bed ' of Bristow & Ethe- 

 ridge, and correspond to the ' Bottom Lias ' of Dunball. 



The authors of the officia] record, of the notes in the Geological 

 Survey Memoir, and myself, all differ with regard to the point where 

 the line between the lihaetic and the Lias should be drawn ; but 

 I think that the horizon at which I have placed it is in harmony 

 with the allocation that I have made at other localities. 



The component layers of the Langport Beds agree very closely with 

 their equivalents at Blue Anchor Point and Lavernock, and do not 

 require anything to be said about them — beyond drawing attention 

 to the fact that the lower layer of the compound bed identified with 

 the Sun-Bed is very rubbly at the base, and contains well-rolled 



1 The details of the Sully Beds are derived from Bristow & Etheridge's 

 account. 



