: XIII. 



NOTICE 



OF THE 



OCCURRENCE OF GYPSUM 



/ IN THE 



INDO-GANGETIC TRACT OF MOUNTAINS. 



By Capt. J. D. HERBERT, Sup. Min. Sur. 



In the Weriierian arrangement of rocks, we find distinct places assign- 

 ed to the titles Primitive, Transition, and Flcetz, Gypsum, leading to the 

 conclusion that this mineral is found, to some extent, in rocks of these 

 several ages. Some geologists, however, appear to doubt the existence of 

 Primitive or Primary Gypsum. Dr. Macculloch, in his "classification of 

 rocks," hesitates to admit it. So does a writer in the 20th volume of the 

 British Review, who yet adopts the Wernerian arrangement, as, in the 

 main, conformable to observation. Professor Jameson states, that it has 

 not been found in extensive masses in any primary rock. Professor 

 Cleaveland admits its occurrence in the Alps, but it is most probable that 

 he alludes to the fact mentioned by M. Humboldt in his " Gissement 

 des Rochers," who states that at the Splugen pass, in the Alps, primitive 



gypsum 



