TAWNG-PENG SYSTEM s CHAUNG-MAGYI SERIES. 



51 



very narrow ribbon separating the Plateau Limestones from the slaty 

 series, or in many places not appearing at the surface at all, the 

 limestones overlapping them and resting directly upon the slates 

 and quartzites. 



To the south-east of Loi Ling these rocks occupy an irregular 

 area, the structure of which is by no means easy 

 (sSn mfmZ S U)! to un^vel. In fact, the details, as shown on the 

 map, must be considered as merely an approxi- 

 mation, more or less close, to the truth. The whole tract is a maze 

 of hills densely covered with jungle, and the only means of arriving 

 at any knowledge of the rocks is to make traverses as far as 

 possible across the strike, and correlate the scattered observations 

 thus made of outcrops, often at considerable distances apart, with 

 each other. It is quite impossible to follow up the outcrop of any 

 particular bed from one point to another, and as the paths almost 

 invariably run directly across the ranges, it is seldom that they coin- 

 cide in direction for more than a few yards at a time with the 

 general strike of the rocks. It is therefore difficult to obtain any 

 accurate conception of the general structure of this mass of hills, 

 but briefly it may be described as that of a series of elongated 

 domes, whose axes run more or less directly north and south. 

 These have been broken up by a complicated set of great faults, 

 whereby huge wedge-shaped masses of the overlying strata have 

 been let down among the older rocks, some of the faults striking 

 in a direction almost parallel to the axes of the domes, while others 

 cut directly across them. The quartzites and slates occupy the core 

 of the domes, and rise into lofty ridges and peaks, attaining 

 altitudes of between 4,000 to 6,000 feet above the level of the sea. 

 Another detached area of these rocks is found to the south of 

 the plateau, in the sub State of Mong Tung, 



Loi Pan — Loi Twang t 



ran „ es ° forming a conspicuous mountain mass rising in 



Loi Pan to a height of 6,693 feet above sea 

 level, and extending to the south into the Southern Shan States 

 of Mong Kiing and Kehsi Mansam, the three States meeting along 

 the ridge of Loi Twang, 5,752 feet, at the southern end of the 

 range. The northern portion of this range is composed of the 

 ordinary slates and quartzites of the Chaung-Magyi series, rising 

 abruptly from the surrounding limestone plateau, without any 

 intervening fringe of the lower Paleozoic rocks. The prevailing 

 strike of the rocks is from north-east to south-west, but it is, as 



E 2 



