JURASSIC SYSTEM : NAMYAU SERIES. 



305 



that it is now entirely removed from the western portion of the Shan 

 plateau. No occurrence of it is known to the west of the Gokteik 

 gorge, and to the east it makes its first appearance at the conflux 

 of the Namhsim with the Nam-Tu near Bawgyo. To the north 

 and south of Hsipaw it covers a very wide area, and it is well 

 developed along the railwav from that place towards Lashio, es- 

 pecially in the valley of the Namyau river, from which its name 



has been taken. The magnificent falls of 

 Man-sang Falls. . . r 



Manlong-Man-sang on this river (sze Jbrontis- 



piece) between Se In and Manhpwi stations, owe their existence to 



the more rapid erosion of the red beds as compared with that of the 



Plateau Limestone, against which the former are let down by a fault 



crossing the river below the falls. A study of the map will show that 



the boundary of the formation frequently 



Faulted boundaries. . " , ,, 4 -, .. . -i ,1 



coincides with a taulr. And it is evidently to 

 this circumstance, — that the red beds have been faulted down among 

 the hard limestones, — that in most cases they owe their preservation 

 from complete denudation ; though here and there outlying patches 

 may be found which are not protected by faults, as for instance 

 on the plateau south of the cart-road, between Hsipaw and the 

 Nampawng. 



To the east of Lashio there is another large area of these rocks, 

 extending from the northern side of the Nam- 

 pawng valley in a north-easterly direction to 

 and beyond the Lashio coal-field on the Namyau. On the latter 

 river these beds attracted the attention of Dr. Noetling, who refers 

 to them as " red sandstones of undetermined age," 1 but he was 

 not aware of their extension to the north and south, and in- 

 troduces a somewhat fanciful theory to account for their presence 

 in the river valley ('.p. dt., p. 102, sei ant-', p. 5). How much 



. , further they extend to the north is not yet 

 Probable equivalents . , ■; . . . .. , . , , 



in China. known ; but precisely similar beds have be^n 



found by Mr. Coggin Brown in Yunnan, over- 

 lying the Napeng beds discovered by him in that country, and 

 v. Lorzy lias described strata of the same character and age, occurring 

 in Sze-chuan and other parts of China. 2 



1 Coal Fields in the Northern Shan States ; Records, Qeol. burr. Intl., Vol. XXIV, 

 Pt. 2, pp. 103, 105. 



2 Jteise des (irafcn Bela Szeohenyi, Vol. I, pp. 4."!!), 671. 



