24 



Prof. BucKLAND and Mr. De la Beche on the 



Calne, and Scarborough^ and in the sandy beds of its lower region, the same 

 huge semi-calcareous concretions that occur in the calcareous grit of Wilts 

 and Oxon. The corals which abound in this formation, in the two last- 

 named counties, and which there give it the name of Coral Rag, are rare on 

 the coast of Dorsetshire, just as reefs of modern corals occur at unconnected 

 intervals in our modern tropical seas. In the Annals of Philosophy* Prof, 

 Sedgwick has published a list of the beds composing the cliffs between 

 Portland Ferry and Weymouth Harbour, and of the principal organic 

 remains which they contain : he divides the whole series into nine groups, 

 which, in the following section, we have subdivided further into thirty-one 

 beds, included between the Kimmeridge clay at the top, and the Oxford clay 

 at the bottom, of the whole series. 



Section between Portland Ferry and Weymouth. — (Order descending.) 



9. Grit bed, — Trigoniae and Melania Hed- 

 dingtoniensis abundant. 



10. Grit bed, — Trigoniae abundant: the Tri- 

 goniae fill more than half of the beds 

 Nos. 7, 8, 9, & 10. 



11. Grey marl. 



12. More compact grit — few shells. 



13. Same as No. 10. 



14. Grit. 



15. Grit, with Melanise. 



16. Grey marl, about four feet. 



17. Sandy bed. 



18. Limestone full of broken shells. 



19. Grit. 



20. Dark grey sandy clay, four or five feet. 



21. Light brown oolite, — jointed Ammonite 

 — joints filled by hornstone. Jmm. ver- 

 tehralis ? 



22. Grey marl, five feet. 



23. Oolite, three feet — marl parting. 



24. Oolite, one foot. 



25. Gritty marlstone. 



26. Grey marlstone and marl, tending to con- 

 cretions, twenty-five feet. 



27. Fox-coloured sands, twelve feet. 



28. Grey marl, twenty feet. 



29. Alternations of calcareous grit and marls, 

 eighteen feet ; — Pectines, oysters, Nau- 

 tili, Trigoniae, Serpulae. 



1 . Considerable thickness of K immeridge clay, 



containing an abundance of the Ostrea 

 deltoidea. At about fifteen feet above 

 No. 2, clay iron-stone two feet thick — 

 partly in nodules. 



2. Brownish red bed, about six feet — lime- 



stone with small vesicles at top, gritty at 

 bottom — cylindrical and round concre- 

 tions of iron — contains deltoid oysters, 

 Serpulae, Pectines, Belemnites, and lig- 

 nite. 



3. Grey grit, full of concretions resembling 



the stalks of Alcyonia, and crossing one 

 another horizontally like a mass of en- 

 tangled and inosculating roots ; the ex- 

 posed surface is ferruginous. 



4. Grey marl-clay. 



5. Ferruginous bed, with eagle-stones : at 



first about one foot thick, afterwards 

 swells out considerably under Sandsfoot 

 Castle. Lima rudis ? abundant. 



6. Sandy grey and green marl — contains a 



continuous bed of deltoid oysters — also 

 lignite. 



7. Grit bed, — brown grey, Alcyonium-shaped 



concretions — Trigoniae abundant — one 

 foot. Clay parting. 



8. Grit bed, — Trigoniae abundant; clay part- 



ing. 



* Annals of Philosophy, May 1826, p. 346. 



