OKJJOVICIAN SYSTEM: UPPER NAUNGKANGYI STAGE. g 5 



mainly of bright purple claystones. In the western area a pre- 

 cisely similar purple band occurs at the top of the variegated 

 Naungkangyi shales, and though only a few feet in thickness, 

 is very conspicuous by reason of its dark colour, and very 

 persistent over a wide area. In mapping the country, I thought 

 at first that there were peculiarities in the fauna of this purple 

 band which were reproduced throughout the purple beds of the 

 eastern area, and I therefore gave the latter 



Hwe-Mawng beds. , , , „ , T 



a separate name, that of the Hwe-Mawng 

 beds, from a village where I hit upon a very rich assemblage of 

 fossils, 7 miles to the west of Kehsi Mansam. During the pro- 

 gress, however, of the last field-season's work in the Shan States. 

 19C6-07, Mr. Coggin Brown and I collected from the variegated 

 shales below the horizon of the purple band, at a locality 

 near Lilu in the Nam-Tu valley, a number of trilobites which 

 seem to be identical with those from Hwe-Mawng, and it is there- 

 fore quite likely that the purple beds of the east represent the whole 

 of the upper Naungkangyis of the west. The fossils from both 

 areas have been sent to Mr. Cowper Reed for identification and de- 

 scription, but he has not yet had time to work them out. He 

 has, however, kindly furnished me with a preliminary list of them, 

 but the specimens cannot be said to possess the same value in fix- 

 ing the horizon of the beds as those whose description has already 

 been published. His provisional determinations are therefore marked 

 in the list given below by the sign P ; while new forms are printed 

 in heavy type, and the asterisk* signifies those which also occur in the 

 lower Naungkangyis. At the same time I think it advisable to retain 

 the separate names for the present, since it is not yet certain how 

 far the beds as developed in the two areas correspond with each 

 other. 



Upper Naungkangyi Fossils (Western Area). 



Anthozoa 



P. Favosites sp. 

 Cystidea : — ■ 



* Echinocncrinus cf. angulosus Pander 



* ,, aff. Sencienbergi E. v, Meyer 

 Cryocrinus sp. 



L\ Heliocrinue sp. 



