FORMATIONS AND FOSSILS OF SOUTH MANCHUIIIA 9 



He states that in his opinion the lower boundary of the Ordovician 

 lies at the top of the Uzumaki limestone, but hitherto most of the 

 Manchurian as well as Japanese geologists maintained that the lower 

 margin of the Uzumaki limestone is the boundary between the Cam- 

 brian and Ordovician strata. 



In 1930 Ozaki redescribed his columnar section, summarizing it 

 as follows, in descending order: 



Tapu limestone. 

 Shanpingehou limestone 

 Toufangkou limestone 

 Taling limestone 

 Hsiapingcliou dolomite 

 Chingchiawan limestone 



T. Kobayashi (1929) restudied the strata from the Middle Cam- 

 brian to the Ordovician and subdivided the so-called Ordovician 

 beds near Huo-lien-chai on the Antung-Mukden line as follows, in 

 descending order : 



Toufangkou Series, 



X. Nodular and banded limestone 50^-170 m. 



IX. Toufangkou limestone 8-100 m. 



VIII. Banded limestone with interbedded edgewise conglomerates- 40-60 m. 

 Wolung Series. 



VII. Wolung limestone 30-40 m. 



VI. Banded limestone with interbedded edgewise conglomerate- 20-30 m. 

 Wanwan Series. 



V. Crystalline limestone 5-15 m. 



IV. Chiushukou shale__ . 5-15 m. 



III. Wanwankou limestone 20-30 m. 



In my 1928 paper, I summarized the section as follows : 



The order of succession of the Ordovician strata in the Tai-tzu-ho and Pe- 

 chili districts is, in general, the same, and consists of the largest sized algal 

 limestone, edgewise conglomerate, crystalline limestone, lower banded lime- 

 stone, dolomitic limestone and upper banded limestone in ascending order. 



Subsequently further field work and more exact paleontologic 

 studies have shown that the beds from the crystalline limestone 

 down to the algal limestone really represent the Ozarkian. What 

 I formerly called the lower banded limestone is now subdivided 

 into three formations, viz, the Wuting, the Kangyao, and the Santao ; 

 the last yields characteristic Canadian fossils, while the other two 

 belong to the lower Ordovician. The so-called dolomitic limestone 

 and the upper banded limestone of my preliminary report are herein 

 grouped as the Middle Ordovician Ssuyen formation. 



As this report was in preparation, I received a paper entitled 

 " On the Geology of the Chinchou District in the Kuantung Province, 

 South Manchuria," by S. Matsushita, a professor of the Ryojun En- 

 gineering College, Manchuria. He gives a detailed description of 



