SILURIAN SYSTEM: UPPER NAMHSIM STACK. 



Ill 



(Loc. 63, J 4), on the path from Pa-tep to Mong Heng, in the 

 Nam Ha valley. 



The upper Namhsims also occur along both sides of the Loi 



Twang range, in Kehsi Mansam and Mong 

 Loi Twang range. T _.. . , . . ., . , 



Kung, out their presence is usually only to be 



detected by the low mounds of loose sand into which they break 

 up, and outcrops of solid rock are very seldom seen. A few 

 specimens of Phacops sJianensis Eeed, the species that is so abund- 

 ant at Kyinganaing, near the western edge of the plateau, wer? 

 found in a small outcrop in the Nam Ka, about half a mile north- 

 west of Hamngai, in the state of Mong Kung, on the eastern side 

 of the range (Loc. 60, Gr 5). 



The homotaxial relations of the fauna of the Namhsim forma- 

 tion with that of other regions are summar- 



tionofTpedes 1 ised in TableS 4 alld 5 > a neW S P ecies bein g 



printed in heavier type, and those which are 

 found in both divisions of the formatio" being marked by an 

 asterisk : — • 



L 2 



