598 



E. C. ABENDANON 





s 



^ 



the three antichnes of the Wu-shan gorge. In 

 this synclinal area occurs for the first time down- 

 stream since K'ui-chou-fu besides the reddish- 

 brown and the slaty limestone formations, the 

 sandstone formation and that of K'ui-chou-hien. 

 After K'uan-tu-k'ou the Yang-tzi, much wider 

 now, flows through a narrow ENE-WSW trend- 

 ing syncline, in the reddish-brown and the slaty 

 limestone formations, until upstream from Wan- 

 h'ou-two, it strikes a 30° south-dipping limb, and 

 so again is turned toward the east and the south- 

 east. Another bend in the trend of the layers is 

 also observable in their dip. From the south- 

 dipping layers the river is headed into north- 

 dipping ones,* which again become NE-dipping, 

 the layers being thereby much fractured. Before 

 Pa-tung-hien the dip is again toward the north 

 and then northwest. Just below Pa-tung-hien the 

 Yang-tzi cuts across the upper part of a local fold 

 in the gorges-limestone formation, thus showing 

 in the right river bank the section as represented 

 in Fig. 6. It is still the same north-dipping hmb 

 of the most southerly Wu-shan gorge antichne; 

 and the layers, dipping consecutively NW, N, and 

 NE, plainly reproduce the fold in the limb. 



The Yang-tzi then continues its way in the 

 30°-4o° north-dipping layers of the reddish-brown 

 formation, trending ESE-WNW, and then in the 

 slaty limestone formation, which here has much 

 diminished in thickness and individuality. Near 

 the Niu-k'ou-t'an the river reaches the base of the 

 sandstone formation, consisting of dark-green slaty 

 sandstones. The river now flows almost in the 

 trend of the layers. 



Near Pa-t'ou-t'an, the right bank consists of 

 the reddish-brown formation, above which still lie 

 a few slaiy hmestone beds; the left bank is of the 



