1837.] Geological Specimens from Kemaon. 655 



18. Specimen of a similar appearance from a similar geognostic posi- 

 tion. Its specific gravity approaches that of gypsum more nearly than that 

 of the last. 



19. Mica-slate with chlorite, approaching closely to the character of 

 clay-slate. It is interposed between 5 and the oldest clay-slate (24) and 

 occurs extensively in Kalee Kemaon. 



20. Hornblende-slate from the Ramessa valley. 



21. Mica-slate occurring in beds of gneiss at Choura Pany, and with 

 beds of quartz at Durgurrah. 



22. Transition between mica-slate and clay-slate, Ponar valley. 



23. Quartz containing mica (Inq. Kem. 64) described in mistake as 

 oldest gypsum. It occurs in mica-slate at Durgurrah, and forms extensive 

 beds in that rock. The mica-slate adjoining these beds for the distance 

 of several miles on each side contains no quartz. 



24. Clay-slate, oldest variety, (1 variat. Inq. Kem. 70.) 



25. Old blue clay-slate, (2 variat. Inq. Kem. 70.) 



26. Newest clay-slate, (3 variat. Inq. Kem. 71.) 



27. A variety of No. 25 denominated roofing-slate : it is of superior 

 quality and answers admirably for the peculiar purpose to which it is ap- 

 plied. 



28. Clay-slate, (4 variat. Inq. Kem. 72.) 



29. Transition slate ? crystalline curved slaty structure with a pearly 

 lustre, by which last it is supposed to be distinguished from 28, the lustre 

 of which is glimmering and depends on specks of mica which are quite 

 absent in this variety, the lustre of which depends on crystalline struc- 

 ture. 



30. A somewhat crystalline bed occurring in the oldest clay-slate (24) 

 on the N. E. foot of Choura Pany near the bed of the Lohoo river* 

 One of the specimens since it was first examined has assumed quite a cu- 

 preous lustre, from which, as well as from its weight, I suspect it to contain 

 a certain portion of copper. A repository of that metal may probably be 

 found in the vicinity of the place from which this specimen was ex- 

 tracted. 



31. Quartz from contemporaneous veins in clay-slate. 



32. Transition between 25 and talc. It is described, perhaps errone- 

 ously, under the name of graphite or drawing slate. (Inq. Kem. 74 and 75.) 

 It affords some of the principal repositories of copper one. 



33. In further illustration of the transition between old blue slate and 

 talc. In this specimen the approximation to clay-slate preponderates. 



34. The same transition, but in this the substance approximates closely 

 to serpentine. Inq. Kem. 133. Its lightness may however with propriety 

 exclude it from that species. 



35. Granular foliated limestone from beds in clay-slate, described as 

 transition limestone. Inq. Kem. 85, 86, 87. 



36. Primitive limestone. Inq. Kem. 75, structure in the great scale 



4 p 2 



