RESEARCH IN CHINA. PLATE XXIV. 
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A. T’ang-hien, Chi-li, atlas sheet F 1, View in foothills west of the city, showing an embayment partially filled with Huang-t’?u formation, 
Hills present characteristic outlines of T’ang-hién stage of physiographic development. The Huang-t’u shows the imperfect vertical 
structure which it frequently has where mingled with residual clay and gravel; itis considered to be a relatively modern alluvial deposit. 
B. T’ien-hua coal field, Shan-si, atlas sheet C I. View of bluff of Huang-t’u hollowed out for dwellings below, vet terraced and cultivated 
above On the right are ovens used for burning pottery made from clays at the base of the coal measures. The Huang-t’u in this 
district is mingled with residual clay and presents a structure similar to that seen in A, but it lies in an abandoned valley of the 
T’ang-hién epoch and is probably relatively very old, 
