LA TOUCHE : GEOLOGY OF NORTHERN SHAN STATES. 



The most complete section of these beds yet found is to be 

 Section of Zebiivyi seen m ^he cuttings on the railway just before 

 scarp (Section I, Plate reaching the small plateau in the centre of 

 which Zebingyi stands (B 5). After surmount- 

 ing the zig-zags above Sedaw, the line still ascends a series of 

 high gradients, with many sharp curves, along the crest of the 

 scarp overhanging the valley of the Sedaw river, passing first 

 through highly inclined Naungkangyi beds, and then through nearly 

 horizontal Plateau Limestone, a poor outcrop oif the Zebingyi beds, 

 which we need not take further notice of now, being cut through 

 at the point of junction. There is then a short level stretch of 

 limestone, just beyond which, at the base of the low scarp border- 

 ing the Zebingyi plateau, there is a fault, and the beds are re- 

 peated. Ascending the line from this point we have, first a poor 

 exposure of the Naungkangyi, or perhaps Nyaungbaw beds, some- 

 what contorted at the lower end of the section, and irregular in 

 dip ; then a series of grey limestones, in thin bedded, regular lay- 

 ers dipping gently to the east-north-east or north-east, containing 

 numerous specimens of Orthoceras and an occasional trilobite. With 

 these are intercalated more shaly, carbonaceous layers crowded 

 with Tentaculites. Higher up the limestones are in thin regular 

 bands, separated by thicker layers of light coloured shale. The 

 whole thickness of these limestones and shales may be about 200 

 feet, but owing to the irregularity of the dip, and the frequent 

 curves taken by the railway, it was impossible to measure it 

 accurately, while on either side of the line the slopes are covered 

 with almost impenetrable jungle, so that no measurements can be 

 made along a direct line. The grey flaggy limestones are followed 

 by about 80 feet of dense black, somewhat earthy limestone, with 

 thin partings of blacK shale, in which the graptolites occur, as- 

 sociated with enormous numbers of Tentaculites eleyans Barrande 

 (Loc. 38, E 5). 



The fossils collected at this locality were ; — 



In the black limestones; Monograptus dubius Suess, a Werdock 



and lower Ludlow species, "characterised bv 

 Fossils : Graptohte beds. . , , 



possessing theca; ot one type only, by the 



outer wall of the first fcheca extending down to the aperture of the 



sicula and inclined to it at a small angle (20° to 30°), and by the 



length of the adult theca being as a rule two or three t imes the 



width .... Miss Wood in describing the species remarks 



