MANDALAY-LASHIO RAILWAY TRAVERSE. 



333 



^ [ Tentaculites beds. 



presumably overlapped along the line of the fault. On emerging 

 from the cutting the line crosses a narrow neck formed of the 

 same beds, and a glimpse may be obtained to the south of a 

 vertical scarp of the Plateau Limestone, the edge of a small out- 

 lying plateau in which these limestones rest almost horizontally 

 upon the upturned edges of the rocks we have been passing through, 

 the Namhsim beds being absent. The limestone is reached 

 a little further on, and at its base is a 

 small exposure of Hack, carbonaceous, shaly 

 limestones containing Tentaculites elegans Ban*. These are the Ze- 

 bingyi beds, but they are very poorly developed here. In a disused 

 quarry close by some grey flaggy limestones may be seen, which 

 belong to the same formation, and contain Orthoceras, either 

 weathered out on the surface or seen in section ; but when I last saw 

 it this quarry was overgrown with jungle and hardly recognisable. 



Winding along the edge of a scarp overlooking the Sedaw gorge 

 the line gradually mounts, through a series 

 of cuttings in the limestone, in some of which 



First plateau. 



From a sketch by the author. 



Fig. 10. Contortion in Plateau Limestone, near Zebingyi. 



