174 
MR. C. BARRINGTON BROWN AND PROFESSOR J. W. JUDD 
The long spur from this peak down to Mogok valley discloses the existence of nine 
of these: one more is seen in the vallev, and one in the above-mentioned falls. 
These vary in width, across their outcrops, from 20 feet to 700 feet. 
The principal band No. 3 (see fig. 3), along which the most important mines are 
situated, is some 300 feet in width and, as far as it can be traced out, extends in a 
sinuous line from Dattau through the end of Letnytaung spur, on the edge of Mogok 
valley, onwards in a westerly direction through Bobadaung. There it curves in a 
south-westerly direction past Pyanbin to Pingu hill, where its course is altered to 
the north-westward as far as Bolong. From thence it passes through Welloo and 
Kyaukmyo to Kabein. 
Beyond this westwards there was no attempt made to fully investigate the lime¬ 
stone band further; in fact, had time allowed, the work would have been almost 
rendered impossible, owing to the trackless nature of the great forest-covered 
mountains of this portion of the district. In places, however, where some of the 
bands crossed the roadway onwards, they were noted ; and I found that (as before- 
mentioned) one band, after curving to the northward in the neighbourhood of 
Wapudoung, became almost horizontal, forming, with but one exception, the surface 
rock along the road nearly to Thebayetkin (see map, fig. 11). 
Although these bands are somewhat parallel to each other in parts, they are not 
so in others, and it would be impossible to exj^ect much regularity in their relations 
to each other, or much conformity in the width of each for any distance, associated 
as they are with a class of rock which must have been subjected to considerable 
disturbance and displacement. In all cases their dips are conformable to the 
foliation of the gneissose rocks (see fig. 3). 
Sketch of part of Letnytaung spur, showing the limestone bands in the gneiss. 
Commencing with the small bands at Mogokchoung Falls, and ending with that 
on the peak next below Taungnee—a distance of four miles —as for as I was able 
to roughly estimate them, their widths were as follows ;— 
