IRONSTONE AND SANDSTONE. 91 



N. B. The beds, No. 2 and 4, are those which meet each other 

 at the point on the east side of Cayton mill, as mentioned in p. 81, 

 and No. 3 is the shale bed that is compressed between them. 



These fovir beds belong to the second shale, which may also 

 appropriate to itself a part of the following, especially as portions of 

 the shale are found among them. 



5. Shale, sandstone, and ironstone, forming the foundation of 

 the highest part of the beach, and so much concealed by sand and 

 gravel, as not to admit of a more particular description. 



6. Soft white sandstone. 



7. Light blue shale, with some ironstone in nodules. 



8. Soft whitish sandstone, like No. 6. 



9. Compact grey sandstone. 



10. Shale, with ironstone nodules. 



11. Schistose sandstone. 



12. Shale, Avith ii'onstone nodules, like No. 10. 

 1 .3. Soft blueish sandstone, 



14. Shale. 



15. Soft sandstone. 



16. Hard sandstone, partly ferruginous, being red externally, and 

 blueish in the recent fracture. 



17. Lowest visible bed of shale. 



18. Various beds of reddish yellow sandstone. 



19. Thick bed of calcareous sandstone, or siliceous limestone, 

 very hard and compact. 



All these beds, from No. 5 downwards, have a dip towards the 

 cliff; so that their edges are exposed one after another, as the tide 

 retires. No. 19, which is the lowest, is also the thickest, and one of 

 the most remarkable. It resembles in structure the immense bed in 

 Whitestone cliff, being 'partly oolitic, and partly granular, with nu- 

 merous small crystals, many of which are oblong. The ova are few 



