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. 



\Yu-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 unconformabh" against the 

 older systems ; but, dipping sharply to the north- 

 west, it is 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, 



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