MIDDLE VANG-TZi'-KIANG GORGES 599 



sandstone formation, overlying which soon appears the K'ui-chou-hien 

 formation. Near Che-men then we see on the right bank the 

 reddish-brown, on the left the sandstone and K'ui-conh formations. 



We must observe the thinning out of the slaty limestone formation. 

 A little farther downstream we see the layers to the right dipping 

 south, and those to the left dipping north, and this fold goes from the 

 right bank to the left just above the Yeh-t'an. This fold occurs in 

 the reddish-brown formation, and thus we have come out of the 

 northern limb into the anticline itself. It we now consider that the 

 same anticlinal crest, which, a little above Fu-li-chi, was estimated 

 at a height of some 500 m. in the gorges-limestone formation (Fig. 4) 

 was at a height of 10 m. near Yeh-t'an in the stratigraphically much 

 higher reddish-brown formation, then the conclusion is patent, that 

 this anticline of Pa-tung (as I shall call it) has greatly diminished in 

 height from west to east. 



The sandstone formation near Yeh-t'an contains layers of coal, as 

 is the case in the Red Basin itself. It rests on the fold in the reddish- 

 brown formation and supports the K'ui-chou layers. Immediately 

 below the Yeh-t'an the fold commences to turn toward the south, and, 

 going downstream, we find the NNE-dipping limb of the sandstone 

 formation, to which soon succeeds the K'ui-chou formation, trending 

 already SE-NW with a dip NE. In the thick sandstone beds, about 

 ten in number, of the K'ui-chou formation which appear typically, 

 especially on the left bank till close to K'ui-chou, we see how the trend 

 gradually becomes NS and the dip 60° east. This plainly shows 

 the deviation of the anticline of Pa-tung, which in general traits has an 

 equatorial direction, to a meridional one, the convex side of the bend 

 being turned toward the NE. The significance of this deviation I 

 have set forth on pp. 180, 181 of my Geologic du Bassin Rouge, where 

 I wrote: 



Another deviation was observed upstream from K'ui-chou; it is the one, 

 to the south, of the anticline which extends from the middle of the Wu-shan 

 gorge in a more or less equatorial direction toward the east. This deviation 

 must have been caused by the powerful anticline of Nan-t'ou, about which later. 



And again on p. 190: 



I must finally assume that the anticline of Nan-t'ou must have formed the 

 line of resistance for the anticlines of the Red Basin, which, in its NE part trend 



