ON THE RUBIES OF BURMA AND ASSOCIATED MINERALS. 
175 
No. 
1. 50 
2. 150 
3. 300 
4. 50 
5. 400 
6. 250 
7. 400 
8. 50 
9. 300 
10. 700 
11. 70 
feet; 20, and 30 feet, in two bands, in Mogokclioung Falls. 
,, on the north side of Mogok valley. 
,, in two bands of 200 and 100 feet, with 100 feet of gneiss 
between, on the north edge of Mogok valley, at end of 
Letnytaung spur, 
on Letnytaung spur. 
in two bands of 300 and 100 feet, with 100 feet of gneiss 
between, on Letnytaung spur, 
close to Letnytaung peak, 
at Letnytaung peak. 
between Letnytaung peak and that below Taungnee. 
in peak next below Taungnee. 
The bands from No. 2 to No. 11, inclusive, occupy a distance of 2-| miles, and 
their collective thickness, across their outcrops on the surface, is about 2670 feet. 
Fig. 4. 
Gneiss in crystalline limestone. 
Small bands of gneiss are frequently seen in the crystalline limestone (see fig. 4), 
as well as those of pegmatite in a few instances. As a general rule the former are 
evenly foliated, and apparently undisturbed, as far as the small sections exposed allow 
them to be seen, but in one or two instances this is otherwise. For instance, a small 
band, 2 feet 6 inches wide, in the limestone (No. 7), on the side of Letnytaung spur, 
is contorted and twisted in a remarkable manner, both the gneiss and limestone 
having the appearance of being at one time subjected to a vertical, and also lateral 
pressure, by rvhich they were rendered, as it were, of a plastic state (see fig. 5). 
Near by, on the mountain top, a band of gneiss, 1 foot 6 inches wide, seems to 
have been ruptured by the limestone being forced through it, when the whole 
appears as if it were subjected to an intense pressure when in a plastic condition 
(see fig. 6). 
A small section of these bands is seen on Taungnee Pass, where they are 
undisturbed, their planes of foliation dipping south at an angle of 55°. 
This is as follows (see fig. 7) :— 
1. White crystalline limestone, containing spinel. 
