€£$.A 



MEMOIRS 



GEOLOGICAL SURVEY 



INDIA. 



VOL. XI. 



PUBLISHED BY OBDEE OF HIS EXCELLENCY THE GOVEBNOB GENEEAL OP INDIA 



IN COUNCIL, 

 TJNDEB THB DIEECTION OF 



THOMAS OLDHAM, LL.D., 



Fellow of the Royal and Geological Societies of London; Member of the Royal Irish Academy j 



Eon. Mem. of the leop-Carol. Academy of Natural Sciences; of the Isis, Dresden; 



of the Roy. Geol. Soc. of Cornwall; of the Soc. Imp. de Natur. 



Moskow ; Corr. Mem. of Zool, Soc, Lond., Sfc, Sfe. 



SUPEBINTENDENT OE THE GEOLOGICAL SUEVEX OE INDIA. 



CALCUTTA: 



PBINTED POB THE GOVEBNMENT OF INDIA. 



SOLD AT THE 



GEOLOGICAL SURVEY OFFICE, 



OFFICE OF SUPERINTENDENT OF GOVERNMENT PRINTING, 



AND BY ALL BOOKSELLERS. 



LONDON: TRUBNER & CO. 



MDCCCLXXV. 



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