SPORT AND SCIENCE ON THE 
ment on the north. This clearly indicates the 
existence of a great synclinal fold in the sedi- 
mentary rocks, extending from the north-west 
of the granite dyke, near Pei-hsiao-tien to this 
point. 
Wu-chia-kou lies in the valley to the north of 
this ridge of limestone. It must be noted that 
our section crosses this ridge somewhat obliquely. 
The northern slope of this valley is of red sand- 
stone belonging to the Man-t’o Shales, the strata 
of which lie unconformably against schists 
of the Wu-t’ai series, and also dip sharply to the 
south-east. The rocks of the Wu-T’ai series are 
soon replaced by a great mass of basal complex, 
probably equivalent to the T’ai-shan complex. 
The outcrops of granite here are very extensive, 
and form the mass of the mountain chain, which 
rises to a great height (10,000 feet), and is about 
five miles wide. 
On the north-western slope of this massive 
range of archaic rock, limestone, similar to 
that on the east, lies unconformably against the 
older systems ; but, dipping sharply to the north- 
west, itis soon replaced by sandstone of the Shansi 
formation, also dipping sharply to the north,west 
and merging into the Wu-tsai plain. 
The occurrence and dip of the sedimentary 
rocks on this side of the range, suggest that 
the strata lie in the form of an immense anti- 
cline, the apex of which has been denuded, 
266 
