96 LA TOUCHE : GEOLOGY OF NORTHERN SHAN STATES. 



as Loi Pamong, beyond which point they have not yet been 

 followed. 



Fragmentary remains of fossils are commonly met with through- 

 Fossil* ou * Danc ^ °^ roc ^ s J DU ^ on ly a ^ one point 

 were they found to be worth collecting. This 

 was at Hwe-Mawng (Loc. 73, H 5), a village at the foot of Loi 

 Twang, 7 miles west of Kehsi Mansam. Here the fossils occur 

 quite low down in the formation, within 100 feet or so of the 

 lower Naungkangyi band, which passes through the village. Well 

 preserved specimens of large trilobites are fairly common, including, 

 according to Mr. Cowper Reed's provisional determination, two new 

 species of Asaphus, one allied to A. (Ptychopyge) Lawrowi Schmidt, 

 a characteristic Kuckers form ; a new species of Phacops resembling 

 P. (Pterygometopus) Panderi Schmidt ; a Calymene allied to C. 

 duplicata Murchison, both characteristic Llandeilo species ; with 

 Plectambonites (?) sp., StraparoUus (?) sp., and two new species of 

 Hyolithes, a very common fossil here. Since these were the first 

 recognisable fossils that I obtained from the purple beds, I have 

 bestowed the name of this village on the formation. 



A small, isolated area of the purple beds was discovered by Mr. 



Coggin Brown on the western side of the Loi 



West side of Loi Pan. , , . . 



ran range at Man-sam-Iai, on the cart road 

 from Mong Tung to Hsipaw, measuring about 4 miles from north to south, 

 by about one mile in breadth. 



In his Memoir on the lower Palaeozoic fossils of the Northern 

 Shan States, Mr. Cowper Reed has already 

 discussed the palaeontological evidence for the 

 age of the Naungkangyi formation, and has established the fact cf 

 its general correspondence with some part of the Ordovician system 

 in Europe and North America. Since, however, the fossils as 

 sent to him were labelled as having been collected from one set 

 of beds, and it was not until afterwards that further work in the 

 field showed that he was justified in assuming that more than 

 one stage was represented, he was obliged to rest content with this 

 gi neral expression of opinion, and to defer a mors definite correlation of 



