136 



PKOCEEDTNGS OF THE GEOLOGICAL SOCIETY. [Jan. 24, 



Section in Pit iVb. 3 (continued). 



Lithology. 

 ] 8. Blue clay with few fossils, 9 ft. 



19. Eubbly soft stone, 4 in. 



20. Eough yellow clay, 4 in. 



21. Rubb y stone, 4 in. 



22. Eough clay, 5 in. 



23. Double oyster-band 



24. Clay, 2 in. 



25. Broken oyster-bavid, 5 in 



26. Clay with light-coloured band at 



the top, 8 in. 



27. Eubbly stone, 2 in. 



28. Clay, 10 in. 



29. Light sandy rubbly clay, 4 in. 



30. Clay containing, about halfway "| 



down, flat layers of hard stone | 

 irregularly scattered, full of 

 fossils, 1 ft. 6 in J 



31. Light sandy clay like 29, 2 ft. 6 in. 



32. Clay, 2 ft. 4 in. 



33. White, easily broken stone, 3 in. • 



34. Clay, 1 ft. 8 in. 



35. Stone like 33, 3 in. 



36. Clay with layers of white clay, 



6 in. 



37. Clay, 3 ft. 4 in. 



38. Whitish sandy stone, 5 in. 



39. Clay to base, about 2 ft. 



Observations. 

 Am. flanorbis (true). 

 Protocardia PhiUppiana. 

 Ichthyosaurus (vertebra). 



Ostrea irregularis, Protocardia Phil- 

 lippiana, Nautilus striatus, Cucullcea 

 hettangiensis. 



Ostrea irregularis. 

 Avicula fallax. 



Protocardia Philippiana. 



Modiola minima. 



Myacitcs musculoides (var. a). 



In this section there are plainly four sets of beds : — 1st, from 1 to 

 7, in which the clays are yellowish and lie in narrow beds between 

 narrow stone layers ; 2nd, from 8 to 18, in which we have thick 

 beds of blue clay separated by thin bands of stone ; in both these 

 sets Foraminifera abound, but suddenly cease with bed 22; 3rd, 

 from 19 to 30, which consist of narrow alternating bands of rough 

 clay and stone containing oyster-beds and other fossils ; 4th, from 

 31 to the base, in which the stone layers are fissile and white, and 

 fossils are absent or exceedingly rare. 



The beds in this pit do not correspond very accurately with those 

 in pit No. 2 ; but beds 1, 2, 3 appear to be equivalent in the two 

 sections, and Nos. 10, 11, 12 in pit No. 3 to be equivalent to No. 10 

 in pit No. 2. 



We have here, then, exposed as complete a series of Infraliassic 

 beds as is to be found in this neighbourhood. The upper two or 

 three beds belong to the zone of Am. angnlatus proper, being the 

 representatives of those which in the other pits are so fossiliferous. 

 The beds from 4 to 22 may constitute the zone of A. planorhis, 

 though that Ammonite is as yet found only in one bed ; above this 

 the beds with Ain. Johnstoni seem a kind of intermediate zone, which 



