SPORT AND SCIENCE ON THE 
River, marking out the course of the Fén Ho in 
Shansi. There seems to be no special reason 
why there should not be a second series of faults 
down the course of the Yellow River. As a 
matter of fact, wherever I have crossed the latter 
from Shansi into Shensi, I have noticed that the 
mountains on the Shansi side are higher and more 
_ precipitous than those on the Shensi side, while 
the strata on either side do not correspond at all 
well. 
Near the head of the Yen-shui valley red sand- 
stone replaces the grey or yellow. Here the loess 
mantle is very much thicker than elsewhere. At 
Ching-pien Hsien no outcrop of sandstone is 
visible, as the course of the stream cuts deeply 
through hardened sand and dark sun-baked mud- 
stone. 
Continuing into the desert we encountered 
nothing but sand, alternating with stretches of 
pale blue-grey clay, in which were lagoons and 
small lakes. As we travelled north-eastward 
from here, along the border, we again encountered 
the red sandstone lying beneath the enormous 
deposits of sand, or in places sand and clay mixed. 
Near Yii-lin Fu this gave place to yellow-grey 
sandstone once more, which continued till we 
again neared the Shansi border, when the shales, 
typical of the Shansi series, once more presented 
themselves, underlying the sandstone. Again at 
Pao-té Chou the difference in levels of the strata 
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