LYELL ON THE EOCEXE BEDS OF NORTH AMERICA. 437 



Shells found at Shell Bluff agreeing with Species in other 

 Eocene Localities. 



1. Conus, like one from Jacksonboro', 12. Dentalium thalloides Con. 



Georgia 13. Crassatella protexta Con. 



2. Cypra?a, like one from Wilmington, ] 4 Lueina pandata Con. 



S. Carolina 15. Lutraria lapidosa Con. 



3. Oliva Alabamensis Conrad 16. Cytherea Poulsoni Con. 



4. Pyrula, apparently agreeing with 17. C. perovata Con. 



one from Claiborne 18. Cardita planicosta 



5 Voluta prisca (Turbinella prisca, 19. C. rotunda Con. 



Con.) 20. Cardium, like one from Jackson- 



6. Trochus agglutinans boro' 



7. Melongena alveata, very common 21. Xucula magnifica Con. 



8. Infundibulum trochiforme 22. Chama, like one from Jackson- 



9. Xatica astites Con. boro' 



10. Bulla, like one from Jacksonboro' 23. Ostrea sellaeformis Con. 



11. Crepidula lirata Con. 24. Pecten membranosus 



The remaining shells, chiefly casts, which I collected, belong to 

 the following genera : Co?ius, Voluta. Turri fella, Fusus. Cytherea, 

 Lithodomus, Solenomi/a, Cardita, Cardium, Pectunculus (two 

 species), Pecten, Area, Ostrea. 



One of the species of Ostrea. 0. Georgia na, has been supposed 

 to agree with the large fossil so common in Touraine. and called 

 by some 0. virginica, but this identification is doubtful. The 

 Shell Blivff species is very remarkable for its enormous thickness 

 and length. 



About nine miles below Shell Bluff, in the Long Reach, is a cliff 

 about eighty feet high, called London Bluff, where the same shelly 

 white calcareous beds again appear, covered with red clay and 

 loam. The horizontal stratification is evident here, as in the cliff 

 two miles below, where the large oysters are seen standing out in 

 relief. Below this, at Stony Bluff in Burke County, near the borders 

 of Scriven County, the calcareous beds have quite disappeared, and 

 siliceous beds of the burrstone series are seen occupying the cliff, 

 and resting upon brick-red and vermilion-coloured loam. This 

 superposition is important, as concurring, with other facts, to show 

 that the burrstone of this region with its eocene fossils is an in- 

 tegral part of that great red loam and quartzose sand formation, 

 usually devoid of fossils, which occupies so large a space between 

 the hypogene (or primary) region and the Atlantic. The quart- 

 zose and siliceous rock of Stony Bluff was, during the last war 

 with Great Britain, quarried for millstones. It passes into a sand- 

 stone with distinct grains of quartz, and is full of cavities and 

 geodes. partially tilled np with crystals of quartz and agates. Por- 

 tions of it are tilled with spicula? of fossil sponges, some of them 

 in a decomposed state, and there are also seen in the same flints, 

 when thin slices are cut and polished, minute flustriform corals 

 and foraminiferous shells, which were detected by Mr. Bowerbank, 

 who has had the kindness to examine the specimens for me micro- 



