g-2 LA TOUCHE : GEOLOGY OF NORTHERN SHAN STATES. 



Magyi rocks, east of the village of Man Hpai, on the path to 

 Mong Heng (Loc. 113, I 4). Here the Nuculas are associated 

 with large numbers of a small Modiolopsis, the casts of which cover 

 whole slabs of rock at a particular horizon. Fragments of large 

 trilobites also occur at this place. 



On the eastern side of the great mass of Chaung-Magyi rocks 

 east of the Nam-Ha valley, the lower Naung- 



Nam-Pang valley. kangyi beds are found again, forming as usual 

 a narrow but persistent fringe along the edge of the older series. 

 Near the southern end of this band, in a ravine just north of the 

 village of Nam-tawng, near Pa-tep (Loc. 112, J 4), an exposure of 

 the peculiar siliceous rock mentioned above occurs, crowded with 

 casts of Ctenodonta, and with them imperfect casts of an indeter- 

 minable gastropod, the only specimens of this class that have been 

 found in these beds. A short distance to the south of this locality 

 the whole of the lower Palaeozoic rocks disappear beneath the lime- 

 stones of the plateau, and are not seen again to the south within the 

 limits of the Northern Shan States. 



Proceeding now in a south-westerly direction across the broad 

 _ .,, , _ . _ plateau that extends towards Kehsi Mansam 



East .side of Loi Pan. * 



in tne Southern khan States, we again meet 

 with the lower Naungkangyi beds along the eastern flanks of the 

 Loi Pan — Loi Twang range, an isolated mass of hills rising like an 

 island from the surrounding plateau. They have not been detected 

 along the western or northern sides of these hills, and are apparently 

 absent along the eastern side also as far as the village of Man-pun, 

 being probably cut out by a fault or concealed by the Plateau Lime- 

 stone, which throughout this distance abuts directly against the base 

 of the hills. The Naungkangyi rocks appear first in the bed of the 

 Nam-la, about a mile south-west of Man-pun (H 4), and run across 

 the slopes of the hills to the east of this river, in a southerly direction 

 to the valley of the Nam-hen, about three and a half miles above 

 the village of Ping-hsai. A collection of fossils was made from this 

 band on the slope of the hills south-east of Man-shio (Loc. 105 

 H 4), about half-way between the village and the peak marked 

 4,596 feet, including Diplotrypa sp. ; Rafinesquina subdeltoidea Reed ; 

 OrtJiis subcrateroides Reed ; 0. irravadica Reed ; and Plectanibonites 

 sericea Sowerby ; also an undetermined species of Hyoliihes and a 

 single specimen of a coiled cephalopod, probably a Lituites. Further 

 collections at this locality include the trilobites Remoplcurides, 



