MIDDLE YANG-TZl KIANG GORGES 



595 



the river to become broader and the banks, especially the left bank, 

 less high. The right bank rises much higher, according to the dip 

 of the layers toward the north. Before Pei-chi the gorges-limestone 

 limb bends slightly toward the SE, visible by the NE dip of the 

 layers. After a short transversal fault, the EW trend of the anticline 

 reappears. Before a cleft in the river bank near Leng-sui-chi, where 

 the layers show many plications, a bar of stones has been formed, 

 and in the gorge itself there is a small rapid, a thing which is very rare 

 in the gorges. A little farther on, we see in front of a cleft in the left 

 bank a bar, formed by m.any reddish-brown and gray pebbles, which 

 reveals the existence, to the north of the river, of a synclinal area of 

 the reddish-brown formation. In fact, I found to the north of Fu- 

 li-chi, the reddish-brown, and also part of the slaty limestone forma- 

 tion, with very slaty layers, caused by the strong compression of the 

 narrow syncline. These show, especially in the slaty Hmestone, all 

 the colors ranging from reddish-brown, orange, yellow, and olive 

 green to grayish-blue. Just 

 before Fu-li-chi there again 

 appears in the mountains to 

 the south of the Yang-tzi a 

 fine dome, standing almost 

 vertically on the river, which 

 thus points to the existence 

 of a third anticline (see 

 Fig. 4). Below Fu-li-chi, 

 till Nan-mu-yiian, the river 

 again penetrates the deeper levels of the gorges-limestone formation. 

 The secondary plications accompanied by small faults, are continued 

 in the layers, which have a general EW trend and dip 60° N. Below 

 Yang-chi-p'ong the river, which was flowing ESE and E, turns to 

 the NE. For this fact we soon find the explication in the NW-dip- 

 ping layers, which therefore point to a turning of the anticlinal axis 

 from an EW to a NSW-NE direction. In this latter portion of the 

 gorge the layers show many small secondary folds and faults, while 

 to the south of the Yang-tzi, in the higher mountains, once more an 

 indication of the anticline is given in the layers that are bent round to 

 a horizontal position. At last, near Kuan-tu-k'ou, we emerge from 



