226 BR0AVELL AND EERKBY ON MAGNESIAS LIMESTONE 



ANALYSES. 



46. 47. 



GEET CONCKETIONS. TELLCW SIABL. 



Carbonate of lime 95-58 56 '53 



magnesia 2-36 38-54 



Sand, clay, oxide of iron, &c. .. 1'40 3-60 



Water, &c 0-66 1-33 



100-00 100-00 



No. 48. LocALur— SEA CLIFF, 



A QUARTER OF A MILE S. OF MARSDEN. 



Lithological Characters. — Whitish yellow, and very soft ; form- 

 ing a series of massive beds that attain a thickness of seventy feet 

 and more, some of which are highly fossiliferons. 



ANALYSIS. 



Carbonate of lime 52-66 



magnesia 45-35 



Sand, clay, oxide of iron, &c 0-73 



Water, &c 1-26 



100-00 



The fallen blocks on the beach have for many years been 

 shipped to the chemical works on the Tyne. 



No. 49. Locality— COAST, 



HALF-WAT HOUSE, RYHOPE. 



Lithological Characters. — Warmish white, compact, laminated, 

 the surface planes very smooth and marked with dendrites (per- 

 oxide of manganese). Occurs several feet thick at this locality ; 

 also at Marsden,^ three miles S.E. of South Shields. 



* An analysis of the Marsden stone is given by Dr. Thomson in the "Annals of Philo- 

 sophy," Vol. IV. 



Carbonate of lime 62-00 



magnesia 35'96 



Insoluble matter 1-60 



Loss 0-U 



100-00 



