198 Dr. Bright on the Strata 



6. Blue clay divided by bands of yellow clay . . feet 12 



7. Limestone resembling No. 3, this occurs at the distance 

 of about 100 yards west of the Well house. 



8. Limestone that is quarried as being fit for burning, 

 forming magnificent cliffs about £ mile beyond the Hot-well 

 house. 



Ft. In. 

 17. — Dove-coloured, oolitic limestone with broken shells. The strata cracked. 8 3 



18. — Grey compact limestone, irregularly oolitic 6 



19. — A stratum somewhat arenaceous, tinged with iron 2 6 



20. — A schistose limestone 1 



21. — Two layers of soft limestone tinged with iron, separated by a layer of schis- 

 tose clay 2 inches thick 



22. — Dark and fine grained limestone, divided in part by loose schistose clay . . 2 

 23. — Seven thin layers of schistose limestone, separated by loose friable schistose 

 clay with nodules, the whole containing many shells of the winged 

 anomiaj and the anomia products, with coralloids 3 



24. — Light coloured and fine grained limestone without animal remains, in 



texture resembling No. 22 1 



25. — Limestone with small broken encrinitcs 2 



26. — Dark oolitic limestone with broken shells 2 



27. — Limestone with broken shells throughout 1 



28. — Schistose clay 3 



29. — Fine siliceous Tock without shells 1 6 



Z0. — Rock with oolitic structure partially coloured by blue clay 2 3 



31. — A reddish limestone with small arms of the encrinite, their cavities filled 



with ochreous matter 6 



32- — Coal about 2 inches thick, resting upon ironstone and red schistose clay, 



three or four inches thick 6 



Of these strata only two will burn into good lime, the rest being too arenaceous for the 

 purpose. The organic structure observed in No. 3, of Mr. Bright's section is the oolitic- 

 texture noticed by Mr. Cumberland. Mr. Cumberland observes that although this texture 

 is still visible in the arenaceous rocks of a mixed nature, it disappears in those which are 

 purely siliceous. He also mentions that an oolitic limestone may be observed lower in the 

 series of the east side of the combe that separates the pure limestone from the black rock 

 or swine-stone. The fossils of the black rock are the winged anomia;, and rarely the 

 anomia producta, the palates of fishes, the claws of crustaceae, corallines of various kinds, 

 the mycetitae of Woodward, the medusa encrinite, and millions of the stalks of encrinites, 



