18 Records of the Geological Survey of India. [vol. v. 
At the point marked C a great fault again cuts off the whole section, and further on, 
Triassic limestones appear dipping to the south-west. 
The mountain-top appears to he formed of the Nummulitic limestone. 
This single section will sufficiently show the difficulties which attend the study of the 
geological structure of these regions. It is so far a satisfactory result that we are able 
to show that the Nummulitics lie above the Jurassics, and the latter above the Triassic. It 
is as yet utterly impossible to go farther than this and attempt to distinguish certain stages 
within the Mesozoic formations of this area. 
Mubbee, ) 
November 1871. 3 
Minebalogical notes on the gneiss of South Miezapue and adjoining country, by 
Teed. R. Mallet, Geological Survey of India. 
In comparison with the gneiss of many other portions of the country, which presents 
a singular dearth in mineralogical variety, that of the Rohr valley offers to the mineralogist 
a tolerably rich field. The number of species known to exist in the area now surveyed is 
pretty large, and further exploration will probably increase it. The following is a complete 
list of those found up to the present time, showing their association and mode of occurrence, 
but I will confine my subsequent remarks to those to which some special interest attaches 
I.—Occurring as constituents of the gneiss. 
Quartz—Orthoelase—Oligoclase—Muscovite—Biotite—Hornblende—Epidote ?. 
II.—Occurring in beds in the gneiss. 
Limestone—Corundum—Magnetite—Quartz as quartzite and quartz schist—Hornblende 
as hornblende rock, tremolite rock and jade—Mica as mica schist—Epidote. 
III. — Occurring in veins in the gneiss. 
A. —In quartz veins and reefs—Quartz. 
B. —In pegmatite veins (as constituents)—Orthoelase—Oligoclase—Quartz—Mica. 
C. —In epidotic veins—Epidote—Quartz. 
IV. —Accidental minerals in the gneiss. 
Magnetite—Ilmenitc—Schorl—Garnet—Stilbite ?. 
V—Minerals occurring in the subordinate beds ( II) of the gneiss. 
In the limestone Magnetite—Pyrites—Haematite—Serpentine—Chrysotile_Phlo- 
gopite ? 
ft .—In corundum bed—Schorl—Euphyllite—Diaspore. 
y.—In jade bed associated with Corundum—Corundum—Rutile P—Schorl—Euphyllite. 
VI.—Occurring in the veins, fyc., in the gneiss. 
a—In quartz veins—Micaceous iron—Tremolite—Augite—Epidote—Schorl—Muscovite. 
—In quartz reef—Galena—Cerusitc. 
I- In pegmatite veins (as accidental minerals) Schorl—Garnet. 
