STRUCTURAL GEOLOGY OF THE MIDDLE YANG-TZI PROVINCE. 289 
shan gorge. ‘The next pitches to the west, that is, we crossed it near its 
eastern end, and a notable tributary comes in from the west by south. 
If the syncline were continued 22 miles, 35 kilometers, in that direction 
in the K’ui-chéu red beds, the valley would strike the Yang-tzi at K’ui- 
chéu-fu, but there is no evidence of such a valley on the maps. The basin 
is probably shorter and runs into a high saddle in the Wu-shan limestone. 
The strike of the folds is also more nearly east and west, and this syncline 
may extend north of K’ui-chou-fu or be represented there by the valley 
of the western branch of the Ta-yang-ho (see general map, Plate VII). 
The three towns, San-shi-, Liu-shi-,and Kiu-shi-li-p’u (namely, Thirty-, 
Sixty-, and Ninety-li village on the imperial highway which once followed 
the river) lie in a wide synclinorium in the K’ui-chéu beds. The river 
meanders along and across the strike, and our observations became cor- 
respondingly disconnected. Details of minor structures in the K’ui-chéu 
beds may have escaped us, but the general section is probably nearly that 
given at the north end of Section AA, atlas sheet d 7, and in the south 




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Fic. 62a.—Continuation of Fig. 62. 
end of Section BB. ‘The deepest syncline may involve 2,000 feet, 600 
meters, of K’ui-chéu strata. Along the northern side of the basin, the 
Wu-shan limestone rises in a fine dip slope. Its counterpart on the south 
is the Wu-shan anticline, cut by the Yang-tzi in the Wu-shan gorge, and 
between the two is the synclinorium of which the preceding paragraphs 
give some account. 
San-shi-li-p’u to Miau-ir-t’an, 16 miles.*—The fact that the Ta-ning-ho 
meanders from west to east in the synclinorium between San-shi-li-p’u and 
Kiu-shi-li-p’u makes it necessary to offset the line of section between those 
two places. From San-shi-li-p’u upstream to Miau-ir-t’an we have a direct 
north-south section, which falls within the Wu-shan-hién atlas sheet, d 7, 
and may be considered by itself, although it is intimately connected with 
and similar to the section from Miau-ir-t’an to Sii-kia-pa. The separation 
of the two is a matter of convenience rather than of fact. 
With reference to the section which has been described as a synclino- 
rium south of San-shi-li-p’u, that north of that place may be considered 
an anticlinorium, since the folds rise higher and expose not only the base 
* Atlas sheet d 7. 
