RESEARCH IN CHINA, PLATE LI. 
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Three and a half miles below Ta-ning-hieén, Ssi-ch’uan, atlas sheet d6. View of canyon of Ta-ning-ho in deepest part of gorge 
cut by the stream across anticlinal arch of Wu-shan limestone, show ing narrow character of inner canyon and higher benches 
developed according to levels of hard and soft strata in the limestone. 
