^Vhoi. 



lh 



lore 



o 



>»: 



SHALES, SLATES, AND BONE-BEDS. 



61 



dcea 



getable , 

 1 I into- 



J more concentrated. 



The change is analogous to that which 



takes place, in the manufacture of coke. In that part of 



'uangeg 





Wales 



Upper 



GrALLERY. 



Wall-case 41 • 



? (; . occupied by the anthracite is much more disturbed than 



that occupied by the bituminous coal, and in South Pern- 



J ln 8 strati 



31 'oadlvdir borkeshire syenitic, and other igneous rocks, have been 



oal, antli, 



v o varieti 



follow! 



ID! 



90*94 



4*28 

 1*21 



1*18 



0*91 

 _T4o 



OO'OO 





es 



-, in 





1 ft 

 * kit 



^ ll V 



intruded amongst them. 



•A. C. Ramsay. 



167. — Graptolite shale from Llandeilo flags. — Conway, 



North Wales 

 168. 



>/ 



Brian date), the surface covered with very fine ripple 



marks. 



m 



169 and 170. — Argillo- arenaceous slate, very fine 

 and soft : cleaved — Quarry near Black Head, St. Austell 

 Bay, Cornwall. 



The specimens in the lowest shelf are mixed, being many 

 of them of sizes too large for the higher shelves. Most of 

 them represent ripple marks, and various other surface 

 markings incidental to sea bottoms. 



171 — Argillaceous limestone, containing iron pyrites, 

 carbonaceous matter, and the coprolites, teeth, and other 

 remains o?jzsh, icthyosauri, &c. This bed, called the "bone 

 bed," formed an ancient sea bottom at the base of the Lias, 

 between the latter formation and the New Red Sandstone. 



From Westbury-on- Severn, Gloucestershire. (See " Memoirs" 

 by the late Mr. Strickland ; « Proceedings of the Geological 

 Society," vol. iii., pp. 585, 732, vol. iv., p. 16 ; « Transactions 

 of the Geological Society," vol. v., p. 331 ; also "Memoirs 

 of the Geological Survey of Great Britain," pp. 281-284, 

 vol. i., Geological Map No. 35, and Horizontal Sections 

 No. 12 ; also « The Geology of the Country around Chelten- 

 ham,^ sheet 44, by Edward Hull, F.G.S. p. 16.) 

 ^ This bed, and some of those immediately associated with 

 it have been classed with the Keuper strata, by Sir Philip 



