74 LA TOUCHE : GEOLOGY OF NORTHERN SHAN STATES. 



elephants ; but they apparently form the western scarp of the con- 

 spicuous peak Hpataunggyi (3,664 feet), which lies on the strike of 

 the beds (see Fig. 3, p. 62). 



Crossing the plateau from the valley of the Chaung-Magyi to 

 Kalagwe, a large village on the main route 



Northern edge of f rom Maymyo to the Euby Mines, and pro- 

 scrap. . 



ceeding northwards, the lower Naungkangyis 



appear again at the base of the hills two miles north of Tawmawgon 



(Loc. 90, C 2), where a small outcrop, full of fossils, occurs on 



„ ., ,„ the path. The rock is a yellow, soft, argilla- 



Fossila, lawrnawgon. r „ n i j .i n 



ceous, nne-gramed marl, and the collection 

 made here includes Heliocrinus sp. ; (?) Diplotrypa sedavensis Reed; 

 Rafinesquina imbrex Pander ; R. subdeltoidea Reed ; Orthis testudin- 

 aria Dalman ; and Orthis subcrateroides Reed. Of these Rafines- 

 quina imbrex and Diplotrypa sedavensis are Sedaw forms ; R. sub- 

 deltoidea, though allied to R. deltoidea Conrad, differs in possessing 

 an internal median ridge in the brachial valve and in ornamentation. 

 It resembles in some respects Strophomena aranea Salter, from Niti. 1 

 R. deltoidea is a well-known European and American form of middle 

 and upper Ordovician age. Only detached plates of the cystidean 

 were found, with rhomb ridges and other features which led Mr. 

 Cowper Reed to refer them to the genus Heliocrinus, but the species is 

 indeterminable. Orthis testudinaria is a well-known and characteristic 

 Ordovician form, ranging from lower Llandeilo to Caradoc, and 0. 

 subcrateroides resembles, according to Mr. Cowper Reed, Leplcena 

 cratera and L. nux from the Ordovician of Niti, described by Salter. 2 

 Along the edge of the plateau, between Tawmawgon and Chaung- 

 zon, at the head of the Gokteik gorge, the 



Fossils, Chaungzon. , , T , . n n „ ■, 



lower JNaungkangyi beds are not well exposed, 

 being either overlapped by higher beds, or cut out by faults. At 

 Chaungzon (Loc. 96, D 3), however, near the foot of the cliffs down 

 which the cart road from Nawnghkio is carried by a series of zig- 

 zags, to the crossing of the Nam-pankse, an outcrop very rich in 

 fossils is exposed in a cutting at a sharp turn in the road just below 

 mile 84. 3 The rocks here consist of thin-bedded hard blue lime- 



1 J. W. Salter and H. F. Blanford : Palaeontology of Niti (Calcutta, 1865), p. 36, 

 PI. Ill, fig. 10. 



2 Ibid, pp. 30, 31, PI. IV, figs. 1, 2. 



3 This is where the old mile-post 85 was placed, as shown on the one inch map. The 

 road between Maymyo and Lashio has been re-measured since the map was published 

 and the present mile-posts do not correspond with their former positions. Those shown 

 on the map will usually be adhered to in describing localities. 



