214 IS 110 WELL AND KIRKBY ON 3IAGNESIAN LIMESTONE 



ANALYSIS. 



Carbonate of lime 94-88 



magnesia 2 - 48 



Oxides of iron, manganese, and alumina. . - 96 



Silica soluble in dilute acid - 32 



Sand, &c 0-72 



9936 

 No. 18. Locality— CONISCLIFF. 



Lithulogical Characters. — Light yellow, compact, varying to 

 sub-oolitic, massive ; unfossiliferous. The most southerly locality 

 for Magnesian Limestone in Durham. 



ANALYSIS. 



Carbonate of lime 66 - 80 



magnesia . . 28-88 



Oxide of iron - 24 



"Water 4-08 



100-00 

 No. 19. Locality— BYHOPE PIT. 



Lithological Characters. — Grey, compact, in thinnish beds, with 

 irregular surface planes, and partings of dark grey shale (No. 22); 

 unfossiliferous. 



ANALYSIS. 



Carbonate of lime 64-96 



magnesia 25 - 12 



Oxide of iron and alumina 2-72 



Sand and clay, &c 6-08 " 



Water, &c 1-12 



100-00 



This limestone usually occurs towards the base of the Lower 

 Limestone, though often separated from the Marl-slate by some 

 yellow or brown beds. 



No. 20. Locality— EYHOPE PIT. 



Lithological Characters. — Yellow, and rather friable ; soiling 

 the fingers. 



