Qrjjartmnu ot Octane ana avt 
GEOLOGICAL SURVEY OF THE 
UNITED KINGDOM. 
MUSEUM OP PRACTICAL GEOLOGY, 
AND 
GOVERNMENT SCHOOL OF MINES. 
(11th Session. 1861-62.) 
LONDON: 
PRINTED BY GEORGE E. EYRE AND WILLIAM SPOTTISWOODE, 
PRINTERS TO THE QUEEN’S MOST EXCELLENT MAJESTY. 
FOR HER MAJESTY’S STATIONERY OFFICE. 
3051. 
* 
p.550 
G 345 
1861 . 
