1872.] BLAKE YOEKSHIEE INPRALIAS. ] 39 



Section in Pit No. 6 (continued). 

 Lithology. ObserFations. 



6. Strong blue Limestone, 10 in. ... | Fosmliferous ; fossils like those of 30, 

 ^ I pit No. 6, and 4 pit No. 4. 



6. Clay, 1 in. 



7. Calcareous sands, 2 ill ^ 



8. Bluer clay, 2 ft. 4 in I 7-9 contain oysters. 



9. Irregular Limestone, 2 in J 



10. Clay, 2 ft. 4 in 



11. Strong even-bedded Limestone! -,xn -^ 



6in \ White. 



12. Clay, 1 ft. 



13. Three or four softish sandstones, 



5 in. 



14. Rather bluer clay, 3 ft. 



15. Narrow white Limestone-band, 



very regular but septarian, 3 in. 



16. Clay to base, 2 ft. 



I have not been able to secure many fossils from this pit ; but there 

 appears little clifRoulty in correlating its beds to those of pit No. 4. 

 Bed No. 5 in this pit corresponds to No. 4 in that ; all above 5 in this 

 corresponds to No. 3 in that; Nos. 6, 7, 8 here to No. 5 ; No. 9 to 

 No. 6 ; No. 10 to 7; No. 11 to 8 ; No. 12 to 9 ; No. 13 to 10 ; No. 

 14 to 11 ; No. 15 to 12 ; No. 16 to part of 13, leaving about 13 

 feet more to be seen in pit No. 4 than in No. 6. 



From the fragments of the oyster-bands scattered in this pit I have 

 obtained the following fossils : — 



Ichthyosaurus (phalange). 

 Cerithium, sp. 



Myacites musculoides (SchL). 

 Ostrea irregularis (Mstr.). 



Ostrea arcuata (Lam.)? 

 Avicula fallax (Pflucker). 

 Montlivaltia Haimei (Chap. ^- Dew.). 



These, then, are the Infraliassic sections exposed in the neighbour- 

 hood of Cliff ; and taking them all together, they give us the beds 

 from the middle of the zone oi Ammonites angulatus nearly to the 

 horizon where Avicula contorta should be found. 



The Middle Lias beds are found half a mile to the east, at Hotham ; 

 and it is therefore probable that sections opened in this interval 

 would reveal the higher beds of the Lower Lias. The beds below 

 this series we cannot perhaps hope to find, from the thickness of the 

 alluvial sands which intervene between this and the nearest Keuper 

 beds at Harswell. 



With regard to the lie of these beds, there appears to be a slight 

 anticlinal near pit No. 4, in which the lowest beds are seen, and 

 where they seem to have been subjected to some disturbance, being 

 twisted and thrown up in one part into a nearly vertical position. 



To the north of this spot the beds dip at a small angle to the 

 N.E., and' to the south of it slightly to the S.E. Taking all together 

 we have the general section as represented below (fig. 1). 



"With regard to the palaeontology, it appears that the greater 

 number of fossils can be named from those of the same horizons 



