340 LA TOUCHE : GEOLOGY OF NORTHERN SHAN STATES. 



built, are composed of the highly inclined Chaung-Magyi rocks. 

 At the base of these there is a fringe of Namhsim sandstones, 

 forming a precipitous scarp overhanging the river ; and at the 

 base of these again, just above the river, appears the purple, 

 schistose-looking limestone at the top of the Naungkangyis, 

 followed by the variegated shales of the same formation. 



The straths on both sides of the river are on Plateau Limestone, 

 which may be seen cropping out here and there, cut off from the 

 scarp by a fault of considerable throw. To the north of the vil- 

 lage the Namhsim sandstones form a densely forest-clad hill, 

 apparently the end of a long dome-shaped east and west fold, 

 probably faulted along its northern limb, which disappears abruptly 

 on the river bank ; and behind this the Naungkangyi beds are 

 exposed, at the foot of the zig-zags on the road leading across the 

 j hills to Mong Long, backed by the Chaung- 



Magyi rocks. The amount of faulting and 

 folding that seems to have taken place in this angle is extraordinary ; 

 and the ground is so concealed with rainwash and vegetation, 

 generally at the most critical points, that although I spent several 

 days over it, I was unable to satisfy myself as to the true struc- 

 ture. Specimens of Pliomera ingsangensis may be collected in this 

 neighbourhood at Hweyawt (Loc. 95, D 3), and at the foot of 

 the main range of hills north of Namsaw (Loc. 94, D 2). 



The main area of the Napeng beds may also be reached con- 

 , , veniently from Pyaungsraune, bv a road bra nch- 



INapeng beds. . , , 00 ° * . 



ing ofi from the cart-road at Ky-wai-kong, 



about 5 miles north-east of the station, the whole distance being 

 about 10 miles. Fragments of the shales are first met with on 

 a ridge about half a mile short of the village of Xapeng, and are 

 in situ in the bed of a small stream just beyond (Loc. 15. E 3), 

 and at the village itself. The outcrop in the stream bed is ex- 

 ceedingly rich in fossils, and most of the species peculiar to these 



beds, including Pteria (Avicula) contorta Portl. 

 Fossils. _ ° „ . 



Urammatodon Lycettu Aloore, hervitlia pre- 

 cursor Quenst., Protocardia contusa Healey, as well as fine specimens 

 of the new genus Burmesia, may be obtained. 



Returning to the railway, from Pyaunggaung eastwards the 

 line passes over Plateau Limestone for several 



K> P auk^c eaUng 10 miles ' runnin g parallel to the foot of the 

 dome-shaped fold in the N;iinhsim sandstones 



