346 LA TOUCHE : GEOLOGY OE NORTHERN SHAN STATES. 



To the south of the valley the ground rises along the northern 

 , . , flanks of the Loi Len range, this slope being 



Loi Len range. , . , f _ , 



composed almost entirely 01 the Plateau Lime- 

 stone, which also forms a bold craggy hill, known as Loi Sakh, 

 visible to the south-east. Along the crest of this range the series 

 of lower Palaeozoic rocks crops out in a narrow band, resting upon 

 the Chaung-Magyi quartzites and slates which form the whole of 

 the southern slopes. The Naungkangyi beds are also found again on 

 the northern side of the Mong-yaw valley, and are perhaps brought 

 up by a fault, but the geology of that part of the country has 

 not yet been worked out in detail. 



From Mong-yaw to the Salween at Hsopket the road runs 

 t h d entirely over Plateau Limestone, and the 



only point of interest worth recording is that 

 the main watershed between the drainage of the Irrawaddy and 

 that of the Salween is crossed about five miles to the north-east 

 of the village, within 20 miles of the latter river. The descent 

 to the Salween at this place is gentle, though the river flows in a 

 very narrow valley, so precipitous on either side that the railway 

 engineers have not been able to find a practicable route along it 

 towards the Chinese frontier. 



