地学雑誌

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The second part of this article contains the following ten topics :
1) The Okch'eon trough and the Machari facies.
2) The Cambrian system of the Yangtze basin.
3) The Cambrian system of the Chuantien area.
4) The Cambrian system of the Chiangnan area.
5) The Cambrian system of the Tsinling-Huaiyang unstable zone.
6) The lower Lungshan system and the Cambrian of Hainan island.
7) The Kangtien arch and the Changpoung formation.
8) The Yunnan-Malayan geosyncline in the Cambrian period.
9) The thickness of the Cambrian System of Eastern Asia.
10) Summary of the article.
The Hwangho fauna is well represented in the Tsuibon type sequence of South Korea as well as the Changpoung formation on the Yunnan-Viet-Nam borderland (tables 9 and 16). The archaeocyathid-limestone is widely distributed in the Chuantien area where the best display of the Mantoan series is seen (figure 7, table 11). It is a remarkable fact that the Chiangnan fauna is more closely related to the Baltic and other faunas in remote places than the above faunas.
The fauna of this kind is contained in South Korea in the Machari facies in the axial zone of the Okch'eon trough of which black carbonaceous shale and dark grey limestone are two typical members. Because the tailing out of terrigenous sediments from the Yeongnam land side to the axial zone of the trough is clearly seen in South Korea (fig. 6), it is certain that the Machari facies and the Chiangnan fauna indicate the off-shore area of deeper water than the Chuantien shelf sea.
The palaeogeographic provinces of Eastern Asia in the Cambrian period is shown in Figure 8 and the average thickness of the Cambrian system at various places in Eastern Asia in Fig. 10. Broadly speaking, the areal difference in thickness is much greater in the Yangtze basin than the Hwangho basin. Their relation to the surrounding geotectonic elements is discussed in some length and it is pointed out that the Chichibu geosyncline or the pericontinental geosyncline on the northwestern Pacific side must have been existed already in the Cambrin period

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