Geology of the Valley of Oodipoor. gff 



4j4iln the observations I have made, I have spoken of well known 

 facts, but such as appear to have no analogy with each other, 

 and I think I have perceived that they all depend on the parti* 

 cular property of the blue ray, that, viz. of being reflected pre- 

 ferably to the other more or less refrangible rays, by the simple 

 mechanical resistance of the molecules of the bodies which trans- 

 mit the light. This resistance takes place in great masses of 

 transparent fluids, such as the air niingled with the vapour of 

 water, and water mingled with air. It takes place in opaque 

 bodies, which are less transparent, but only when they are of 

 small dimensions. Finally, it is observed in opaque white or 

 coloured bodies, as in the fine skin which covers the veins, and 

 in the mixture of colours. — Bib, Un. Nov. 1832. 



GEOLOGY OF THE VALLEY OF OODIPOOR. By JaMES HaRDIE, 



'i^. Esq. Bengal Medical Establishment, Member of the Asiatic 

 Society, Sfc, Communicated by the Author, (Ccmtinuedfrom 

 p. 282. vol. xiv. 



The rocks found in the Valley of Oodipoor belong to the ar- 

 gillaceous schist series. They consist of a variety of argillace- 

 ous and talco-argillaceous schists, greenstones, greenstone schists, 

 quartz-rocks, and limestones, or rather limestone schists. The 

 great majority of these are distinctly stratified, the strata are al- 

 ways highly inclined, generally speaking vertical, or nearly so ; 

 in many situations they arq much distorted, and local deviations 

 from the general parallelism of the rocky beds are constantly ob- 

 served. Some of these will be more particularly adverted to in 

 the sequel ; in the mean time, it may be laid down as a general 

 rule, that the direction of the strata is from N. N. W. to 

 S.S.E. 



The rocks under review belong to a series very extensively 

 distributed throughout this portion of India. In the south of 

 Mewar, more especially, they form the hills and hill ranges of 

 that wild and rugged tract, inhabited by the numerous tribes of 

 Bheells, Colees, Meenahs, and Gapiahs, who, under one or other 

 of these denominations, have for centuries led a life of professed 

 plunderers and robbers. This series is generally disposed in re- 



