Note 10 — PART I The Geology of the Country traversed by the Chen-T’ai Railway: Western Chihli and Eastern Shansi

This limestone occurs also in the Wu-t’ai Hsien district of Shansi, besides forming a large mass of the mountains at the famous Nan-k’ou pass north of Peking, at which point it was described and named “Untersinisch” by Richthofen. This was subsequently divided from the Sinian system by the members of the Carnegie Expedition, 1904, who discovered the unconformity between the two systems.