AND ASSOCIATED PERMIAN ROCKS OF DURHAM. 211 



ANALYSIS. 



Carbonate of lime 24*86 



magnesia 12-70 



Oxide of iron and alumina 7'00 



Silica soluble in dilute acid 033 



Sand and clay 40-53 



Water, &c 13-33 



98-75 

 No. 12. Locality- CULLERCOATS 



(BETWEEN TIDE MARKS). 



Lithological Characters. — Dark grey, hard, laminated Marl- 

 slate. 



ANALYSIS. 



Carbonate of lime 25-26 



magnesia 13-31 



Oxide of iron and alumina 7 60 



Sand and clay 29-53 



Water, &c 25-00 



100-70 

 Iron almost all protoxide. Trace of manganese. 



No. 13. Locality— FEKBY HILL. 



Lithological Characters. — Brownish grey Marl-slate ; contain- 

 ing Lingulce. 



ANALYSIS. 



Carbonate of lime 37'13 



magnesia 26-12 



Oxide of iron and alumina 3'73 



Sand and clay 24-20 



Water 6-85 



98-03 



No. 14. Locality— BYHOPE PIT. 



TAthological Characters. — Yellow, laminated Marl-slate, ad- 

 joining the limestone. 



