Concrei 



I &C, o, 



lixed. t 



ncretioDi 

 'e of a ( 



' some 

 natter fi 



• . • 



ltic coi: 



lation oi 



rger con 



been for: 



lulation, 



uch rem; 



bras in 

 Ramsay. 



BbisW* 



jfagnes 





san 



a. 





# 



AND NODULES. 



93 



a change in the condition of the shells on which they rest » tt 

 (Rev. O. Fisher « On the Purbeek strata of Dorsetshire " <&. 



-Transactions of the Cambridge Philosophical Society," vol. Wau^, 

 ix., p. 5.) J7 



6.-Columnar limestone, exhibiting a fibrous structure 



resembling that of «< beef " ( 



W 



Canada. 



No 



■Perth, Upp 



7.— Limestone, with a curved and waving structure _ 



Mount, Nova Scotia. Presented by Sir W. E. 



Logan. 



8. — Calcareous 



Tisbury, Wilts. 



f> 



p 



9 and 10.— Flattened calcareous concretions occurrin 



by Mr. Stowe. 



Brickyard, near Buck 





Presented 



Phosphatic nodule, from Gault, with cracks filled 

 with phosphate of lime ; a small septarian.— Longbridge 



Warm 



1 2. — Phosphatic 



Dinton. W\ 



13. 



ha\> 



Wilts. 

 es, yrow 

 Map 15. 



Gault. — From the 



These nodules 



re been analyzed by Dr. Hofmann, and found to contain 

 smca, alumina, iron, lime, and magnesia ;— a portion of the 

 two last as phosphates. — F\ 

 Wilts. Map 15. 



Brichy 



I.idhurst, 



The 



4 



Phosphatic nodules, fragments of bones, teeth 



se are 



extracted in large quantities and after being 

 ground and mixed with sulphuric acid, they constitute a 

 valuable agricultural manure— Near Cambridge. 



15 — Flattened elliptical concretion, exhibiting the 

 structure termed « cone-in-cone;' on one side of the specimen 

 At was found about six feet beneath the surface 

 ttheidol Unitec 



Devil's Bridge. 



at the 



16. 



William 



/» 



SANDY 



