Abstract: Zhang Shuang-quan and Xu Qin-qi emphasize that the stratum bearing the first skull ( Locus E skull) of Peking Man is the red sandy clay, so it should correspond to the Layer 10 of the Main Deposit. The discoverer of the Locus E skull, Pei WC and the first researcher of it, Black reported that the sediment adhered to Locus skull is travertine, so the stratum bearing Locus E skull belongs to the Travertine Layer. With the Layer 10 of the Main Deposit as the frame of reference, the stratum of Lower Cave should correspond to the Layer 11 of the Main Deposit ( Table 1) .

Key words: Horizon; The first skull of Peking Man; Locality 1 of Zhoukoudian