358 LA TOUCHE : GEOLOGY OF NORTHERN SHAN STATES. 



(i) Folds and Associated Faults. 



The folding of the rocks is most conspicuous among the older 



Palaeozoic strata, the massive character of the 

 plE?™ SCarP ° £ Plateau Limestone having masked its effects to 



some extent and compelled this rock to yield by 

 fracture rather than by folding, as I have already pointed out (p. 194). 

 Along the western edge of the plateau, although the Ngwetaung 

 sandstones and the Naungkangyi shales and limestones are thrown, 

 wherever they appear from beneath the Plateau Limestone, into north 

 and south folds, and the latter itself is bent over them, the chief 

 energy of the thrust seems to have been expended in the produc- 

 B (j r f it ^ on °^ ^ e ser i es °f parallel faults to which 



allusion has already been made (p. 352). The 

 outermost of these is that which bounds the Irrawaddy plain, and 

 has brought up the narrow belt of Archaean rocks along the river 

 T "bo fault opposite Mandalay. The second, probably a 



branch of this, cuts off the Plateaa Limestone 

 abruptly at the foot of the hills east of Mandalay, and brings it 

 against the Archaean rocks forming the isolated knolls dotted about 

 f ]t the alluvial plain. A third runs due north 



and south at the back of the hill at Sedaw, 

 and brings the Naungkangyi beds against the Plateau Limestone. 

 This fault has been traced to the north into the valley of the 

 Kyetmaok, a tributary of the Chaung-Magyi, where it seems to die 

 away, the Plateau Limestone being found on both sides of it, and 

 • f ]t southwards to the gorge of the Myitnge. It 



is followed by a minor fault to the west of 

 the Zebingyi scarp, which has not been traced northwards beyond 

 the Sedaw gorge, but another fault, rather more to the east, extends 

 . from near Kyauktin (B 4) down to the Chaung- 



i Chaung Magyi au t. Magyi at Sagabin, and is probably continued 

 up the valley of that river, bringing the Chaung-Magyi series into 

 contact with the Mogok gneiss. This fault may be connected with 

 the Zslingyi fault, but the intervening ground is so densely covered 

 with vegetation that the connection could not be verified. The 

 Zebingyi fault passes to the south, through Nyaungbaw, where it 

 brings the red Nyaungbaw limestone against the Plateau Limestone, 

 into the gorge of the Myitnge. 



