RESEARCH IN CHINA. PLATE XXVIII. 
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Pass of Si-yau-ling, 7 miles north of Ho-chéu, Shan-si. View of the Huang-t’u formation which, though now high above the valley 
of the Fén-ho, is stratified and resembles in nearly level surface and internal structure the same formation in lowlands about 
Hfuang-t’u-chai (see Plate XXVIII). The formation is continuous from one locality to the other and is believed to have 
constituted a uniform deposit, which has since been modified by warping, 
