658 Geological Specimens from Kemaon. [Aug. 



70. Siliceous oolite, Inq. Kern. 117, composing a lofty range of moun- 

 tains, and connected by an insensible transition with the rocks just enu- 

 merated. It differs from any form of quartz rock I am acquainted with, 

 in undergoing spontaneous decomposition. 



71. The same slightly decomposed. 



72. The same still more decomposed and earthy. The last 12 speci- 

 mens, together with the series represented by 47 and 48, which are all 

 connected by natural affinities, compose a large tract of the mountains of 

 Kemaon ; and my collection of specimens from the Abor mountains, several 

 hundred miles to the eastward of Kemaon, is comprised of specimens 

 which would seem to represent a continuation of the same rocks along the 

 whole extent of the Himalaya in this direction. It would be interesting 

 to compare these with the siliceous rocks of the Cordilleras of the Andes, 

 which also appear like the Kemaon siliceous rocks to be subject to rapid 

 decay. 



73. Protogine ? I described this rock under the head of Granitine, 

 Inq. in Kem. 124, and was led to believe the crystalline parts to be 

 dolomite from the local connection which exists between this rock and 

 limestone in all situations in which 1 have had an opportunity of 

 observing it. Its connection with the ores of copper render it inter- 

 esting. 



74. A more characteristic specimen composed of large crystals. 



75. A specimen of the same, but whose crystals are small and closely 

 impacted together as is usual in this rock, the talc being collected in nests 

 rather than uniformly disseminated. 



76. Nearly the same as 74. 



77. The same with a few columnar crystals of talc on one of its sur- 

 faces. 



78. Another variety of the same found in small masses at the base of a 

 lofty and abrupt calcareous mountain in Shore valley. The crystalline 

 parts appear to be arragonite, but the matrix is talc. 



79. Talcose limestone from Shore valley. 



80. Another variety of a similar nature, but with the talcose parts de- 

 cayed and extending longitudinally through the mass in an irregular 

 concentric manner, so as to give it the appearance of a fossil wood, which 

 similitude is further strengthened by the great length and cylindric shape 

 of its masses, so that I was led to consider the first variety as satin spar, 

 Inq. Kem. 125, and the other as a fossil wood, (Inq. Kem. 384. ;) but subse- 

 quent discoveries of both these minerals during my journey in Assam 

 enable me to correct these errors. 



81. Commonly slaty talc. 



82. Another variety (spintery). 



83. The form in which 81 enters into the composition of the talcose 

 limestone. 



