•% 





ej 



-Rich >i 



10, 



GYPSUM AND ROCK SALT. 



35 



Taken in connexion with the " dirt beds " or dry-land sur- 

 faces, it is not unreasonable to infer that, like other lime- 

 stones of the same character, they were partly of lacustrine 

 and partly of subaerial formation H. W.B. 



Upper 

 Galleey. 



Wall-case 40. 



" vio-mari 



contain!; 

 s land 





itrata of 



No. 10. 



irbonifei 



lining 



Llangoli 



11 compa: 





ing speci 



p" beds 



No. t 



15 



n the * 



stone 

 rxrular 



ie 



positii 



he thicks 



•t inter 1 

 "top 



i 



thic^ : 

 to ft*' 



skull 



base , 

 es, * 



occ< 



esp 



ec» 



■ 



Beds formed by Chemical Action. 

 Gypsum (Sulphate of Lime), Rock Salt, &c. 



33.— Massive gypsum (alabaster) from NeivRed Marl. 



Syston, Leicestershire. 



34— Fibrous gypsum, from New Red Marl—Penarch, 



Cardiff, Glamorganshire. 



35.— Fleshcoloured gypsum, showing its mode of oc- 

 currence in the marls of the New Red Sandstone. Cardiff, 



Glamorganshire. Presented by Sir H. T. De la Beche, C.B. 



36. — Fibrous gypsum, 



New 



Leicestershire. 



37.— White 

 the marls of 1 

 ganshire. 



Syston, 



New 



© 



Cardiff, 



38. — Thin fibrous laminae and small irregular concretions 



Syston, Leicestershire. 



Red Mai 



°9. 



— Fibrous gypsum and selenite, occurring in large 

 masses in the lower Purbeck beds of Durlstone Bay, anc 

 used for making plaster of Paris. (See Geological Map 

 No. 16, and Vertical Sections, sheet 22.) Dorset. 



40. — Crystals of Selenite from Gault — Dinton, Wilts. 



41, 



fi 



Sea. — Pre- 



sented by F. Smith. 



42. — Crystals of Selenite, from Lower Green- Sand. 



Atherficld Cliff, Isle of Wight. 



43. Rock Salt (chloride of sodium) 

 Presented by the Marquis of Downshire. 



if 



44. Rock Salt from New Red Marl, used for the manu 



facture of salt. — Cheshire. 



No 



Sandstone of that county, the salt being in large beds of 



b 2 



