118 Report of the Magnetic Survey of India. [No. 2. 



present, it seems that this structure cannot be considered as very 

 general in the Himalayas. "We only found one clear example of it 

 in the Jumnotri and Bussa group. 



There we see the gray slates constantly dipping under the granite, 

 which overlies them in thick masses, forming the high peaks of Bun- 

 derpanch, Shergeroin, &c. 



13th. The Feldspathic crystalline rocks of the centre, are accom- 

 panied by large masses of grey schists, which are especially deve- 

 loped along the Southern side of the central groups ; to the North- 

 ward of them they often form only a very small band, passing into 

 stratified azoic slates. These schists can by no means be consi- 

 dered as a real crystalline rock. 



As in the Alps, they are of a very irregular and varied compo- 

 sition ; they are generally of a greyish colour, and contain large 

 quantities of clay and more or less lime. The quartz is generally 

 not present in regular small grains, but either disseminated through- 

 out the rock or entirely absent. The mica is generally present in 

 exceedingly small laminae. Sometimes considerable quantities of 

 limestone are found between the schists. 



These grey schists extend very nearly from the central groups 

 down to the Southern edge of the Himalayan mountains. There 

 they pass very often into clay slates of a more sedimentary cha- 

 racter. 



We have not been able to discover any fossil remains in the grey 

 schists themselves, but in the clay slates into which they graduate 

 to the Southward, we found, in the neighbourhood of Nynee Tal, 

 numerous Foraminifera, evidently identical with those which accom- 

 pany the eocene numulitic formation ; our observations during next 

 year must teach us, whether we shall be justified in drawing a 

 general conclusion from this fact, as to the age of the outer ranges 

 of the Himalaya composed of similar clay slates. 



14th. It was observed a long time ago, that in the great mass of 

 grey schists which must be traversed before reaching the central 

 group of the Himalayas, a remarkable uniformity in the dip of 



of the gneiss dip from both sides under the highest part in the centre, where they 

 stand vertical, so that by drawing a geological section we get a somewhat fan- 

 like form. 



