3(J4 LA TOUCHE : GEOLOGY OF NORTHERN SHAN STATES. 



nisable but for the ascent of more than one of these springs along 

 its course. This fault was in existence before the deposition of the 

 Tertiary silts of the Lashio coal-field, for they pass across it 

 without any trace of disturbance on one side or the other. It is for 

 this reason, the identity of the rocks on both sides, that it has 

 not been possible to mark the continuation of some of the faults 

 on the map, though there is little doubt that many of them ex- 

 tend beyond the limits shown. 



The faults ot this character met with among the Eastern Ranges 

 exhibit their presence in a somewhat different 



Faults in Eastern w Q()t i the formati(m of lineg q{ ,j ff 



Kanges. J J , ' 



but by the abrupt termination of the fossiliferous 

 bands surrounding the domes. They let down wedge-shaped masses 

 of the overlying rocks among those beneath them, as in the valley 

 of the Nam-Ha, where a long triangular strip of the Plateau Lime- 

 stone, with the Silurian and Ordovician beds below, has been brought 

 into contact with the Chaung-Magyi slates on the eastern side of 

 the valley (Section III, Plate 24). Their direction may cross that of 

 the strike of the rocks at any angle, and they have evidently been formed 

 at a later date than the folds. Here again it is impossible to show the 

 whole length of the faults on the map, for as they die away 

 their throw is not sufficient to bring dissimilar rocks into contact. 



There remains little to be said regarding the geological history 

 of the Northern Shan States since these 

 Sub-recent geological events too k p i ace> j n comm on with a great 

 history. rt' ft- • -i 



part of the continent of Asia, since the period 



of deposition of the Jurassic sandstones this tract has remained above 

 the level of the sea, and the processes that have modified the surface 

 features are the same that we now see in action, and if long enough 

 continued, will result in the reduction of the whole surface to a pene- 

 plain. If we except the folding and faulting described above, only 

 one event took place during this long period of time that is in any 

 way different from those which we now see passing before our eyes ; 

 for the deposition of the late Tertiary silts of the Lashio and other 

 coal basins was effected after the present configuration of hill and 

 valley had been established, and differs in no respect from that 

 which is now going on in the lake basins of the Southern Shan 

 States and Yunnan. It belongs, therefore, rather to recent than to 

 geological history. 



