216 BR0WELL AND KIRKBY ON MAGNESIAN LIMESTONE 



ANALYSIS. 



Carbonate of lime 54-40 



magnesia 46-45 



Oxide of iron and alumina 60 



Sand, clay, &c. 0-13 



101-58 

 No 24. Locality— HOUGHTON-LE-SPKING. 



Lithological Characters. — Yellowish, with white streaks, sub- 

 concretionary — the rock being irregularly compact and hard with 

 bands and pockets of marl, thin-bedded ; unfossiliferous. 



ANALYSIS. 



Carbonate of lime 54-66 



magnesia 44 - 79 



Oxide of iron, &c 106 



Sand 0-46 



100 97 



This limestone is largely developed in the neighbourhood of 

 Houghton-le- Spring, and along the western escarpment of the 

 formation to the north by Pensher Hill to Down Hill, and south- 

 ward by Eppleton to Moorsley and beyond. It is of considerable 

 thickness ; and has been extensively quarried and used for fences, 

 for an inferior building stone, for road-making, and for lime- 

 burning. 



No. 25. Locality.— HASTING HILL. 



Lithological Characters. — Whitish yellow, soft, and very friable, 

 scarcely stratified ; unfossiliferous. Not at all a typical rock of 

 the Lower Limestone, but as it is within the area of outcrop of 

 that member, we cannot but consider it an exceptional form of it. 



ANALYSIS. 



Carbonate of lime 50-96 



magnesia 44 - 72 



Water 432 



100-00 



